Benign prostatic hyperplasia
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Benign prostatic hyperplasia
Other namesBenign enlargement of the prostate (BEP, BPE), adenofibromyomatous hyperplasia, benign prostatic hypertrophy,[1] benign prostatic obstruction[1]
Diagram of a normal prostate (left) and benign prostatic hyperplasia (right)
SpecialtyUrology
SymptomsFrequent urination, trouble starting to urinate, weak stream, inability to urinate, loss of bladder control[1]
ComplicationsUrinary tract infections, bladder stones, kidney failure[2]
Usual onsetAge over 40[1]
CausesUnclear[1]
Risk factorsFamily history, obesity, type 2 diabetes, not enough exercise, erectile dysfunction[1]
Diagnostic methodBased on symptoms and examination after ruling out other possible causes[2]
Differential diagnosisHeart failure, diabetes, prostate cancer[2]
TreatmentLifestyle changes, medications, several procedures, surgery[1][2]
MedicationAlpha blockers such as terazosin, 5α-reductase inhibitors such as finasteride[1]
Frequency94 million men affected globally (2019)[3]
Benign hyperplasia prostate, evidence of bladder neck obstruction.

Benign prostatic hyperplasia (BPH), also called prostate enlargement, is a noncancerous increase in size of the prostate gland.[1] Symptoms may include frequent urination, trouble starting to urinate, weak stream, inability to urinate, or loss of bladder control.[1] Complications can include urinary tract infections, bladder stones, and chronic kidney problems.[2]

The cause is unclear.[1] Risk factors include a family history, obesity, type 2 diabetes, not enough exercise, and erectile dysfunction.[1] Medications like pseudoephedrine, anticholinergics, and calcium channel blockers may worsen symptoms.[2] The underlying mechanism involves the prostate pressing on the urethra thereby making it difficult to pass urine out of the bladder.[1] Diagnosis is typically based on symptoms and examination after ruling out other possible causes.[2]

Treatment options include lifestyle changes, medications, a number of procedures, and surgery.[1][2] In those with mild symptoms, weight loss, decreasing caffeine intake, and exercise are recommended, although the quality of the evidence for exercise is low.[2][4] In those with more significant symptoms, medications may include alpha blockers such as terazosin or 5α-reductase inhibitors such as finasteride.[1] Surgical removal of part of the prostate may be carried out in those who do not improve with other measures.[2] Some herbal medicines that have been studied, such as saw palmetto, have not been shown to help.[2] Other herbal medicines somewhat effective at improving urine flow include beta-sitosterol[5] from Hypoxis rooperi (African star grass), pygeum (extracted from the bark of Prunus africana),[6] pumpkin seeds (Cucurbita pepo), and stinging nettle (Urtica dioica) root.[7]

As of 2019, about 94 million men aged 40 years and older are affected globally.[3] BPH typically begins after the age of 40.[1] The prevalence of clinically diagnosed BPH peaks at 24% in men aged 75–79 years.[3] Based on autopsy studies, half of males aged 50 and over are affected, and this figure climbs to 80% after the age of 80.[3] Although prostate specific antigen levels may be elevated in males with BPH, the condition does not increase the risk of prostate cancer.[8]

The prevalence of enlarged prostate, and symptoms of an enlarged prostate, in men of different ages.[9][10] Graphic from NHS England.[11]

Signs and symptoms

[edit]

BPH is the most common cause of lower urinary tract symptoms (LUTS), which are divided into storage, voiding, and symptoms which occur after urination.[12] Storage symptoms include the need to urinate frequently, waking at night to urinate, urgency (compelling need to void that cannot be deferred), involuntary urination, including involuntary urination at night, or urge incontinence (urine leak following a strong sudden need to urinate).[13] Voiding symptoms include urinary hesitancy (a delay between trying to urinate and the flow actually beginning), intermittency (not continuous),[14] involuntary interruption of voiding, weak urinary stream, straining to void, a sensation of incomplete emptying, and uncontrollable leaking after the end of urination.[15][16][17] These symptoms may be accompanied by bladder pain or pain while urinating, called dysuria.[18]

Bladder outlet obstruction (BOO) can be caused by BPH.[19] Symptoms are abdominal pain, a continuous feeling of a full bladder, frequent urination, acute urinary retention (inability to urinate), pain during urination (dysuria), problems starting urination (urinary hesitancy), slow urine flow, starting and stopping (urinary intermittency), and nocturia.[20]

BPH can be a progressive disease, especially if left untreated. Incomplete voiding results in residual urine or urinary stasis, which can lead to an increased risk of urinary tract infection.[21]

Causes

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Hormones

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Most experts consider androgens (testosterone and related hormones) to play a permissive role in the development of BPH. This means that androgens must be present for BPH to occur, but do not necessarily directly cause the condition. This is supported by evidence suggesting that castrated boys do not develop BPH when they age. In a study of 26 eunuchs from the palace of the Qing dynasty still living in Beijing in 1960, the prostate could not be felt in 81% of the studied eunuchs.[22] The average time since castration was 54 years (range, 41–65 years). On the other hand, some studies suggest that administering exogenous testosterone is not associated with a significant increase in the risk of BPH symptoms, so the role of testosterone in prostate cancer and BPH is still unclear. Further randomized controlled trials with more participants are needed to quantify any risk of giving exogenous testosterone.[23]

Dihydrotestosterone (DHT), a metabolite of testosterone, is a critical mediator of prostatic growth. DHT is synthesized in the prostate from circulating testosterone by the action of the enzyme 5α-reductase, type 2. DHT can act in an autocrine fashion on the stromal cells or in paracrine fashion by diffusing into nearby epithelial cells. In both of these cell types, DHT binds to nuclear androgen receptors and signals the transcription of growth factors that are mitogenic to the epithelial and stromal cells. DHT is ten times more potent than testosterone because it dissociates from the androgen receptor more slowly. The importance of DHT in causing nodular hyperplasia is supported by clinical observations in which an inhibitor of 5α-reductase such as finasteride is given to men with this condition. Therapy with a 5α-reductase inhibitor markedly reduces the DHT content of the prostate and, in turn, reduces prostate volume and BPH symptoms.[24][25]

Testosterone promotes prostate cell proliferation,[26] but relatively low levels of serum testosterone are found in patients with BPH.[27][28] One small study has shown that medical castration lowers the serum and prostate hormone levels unevenly, having less effect on testosterone and DHT levels in the prostate.[29]

Besides testosterone and DHT, other androgens are also known to play a crucial role in BPH development. C
21 11-oxygenated steroids (pregnanes) have been identified are precursors to 11-oxygenated androgens which are also potent agonists for the androgen receptor.[30] Specifically, steroids like 11β-hydroxyprogesterone and 11-ketoprogesterone can be converted to 11-ketodihydrotestosterone, an 11-oxo form of DHT with the same potency. These precursors have also been detected in tissue biopsy samples from patients with BPH, as well as in their serum levels.[31][32][33] Besides that, androgens biosynthesized via a backdoor pathway can contribute to the development of BPH.[31]

While there is some evidence that estrogen may play a role in the cause of BPH, this effect appears to be mediated mainly through local conversion of androgens to estrogen in the prostate tissue rather than a direct effect of estrogen itself.[34] In canine in vivo studies castration, which significantly reduced androgen levels but left estrogen levels unchanged, caused significant atrophy of the prostate.[35] Studies looking for a correlation between prostatic hyperplasia and serum estrogen levels in humans have generally shown none.[28][36]

In 2008, Gat et al. published evidence that BPH is caused by failure in the spermatic venous drainage system resulting in increased hydrostatic pressure and local testosterone levels elevated more than 100-fold above serum levels.[37] If confirmed, this mechanism explains why serum androgen levels do not seem to correlate with BPH and why giving exogenous testosterone would not make much difference.

Diet

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Studies indicate that dietary patterns may affect the development of BPH, but further research is needed to clarify any important relationship.[38] Studies from China suggest that greater protein intake may be a factor in the development of BPH. Men older than 60 in rural areas had very low rates of clinical BPH, while men living in cities and consuming more animal protein had a higher incidence.[39][40] On the other hand, a study in Japanese-American men in Hawaii found a strong negative association with alcohol intake, but a weak positive association with beef intake.[41] In a large prospective cohort study in the US (the Health Professionals Follow-up Study), investigators reported modest associations between BPH (men with strong symptoms of BPH or surgically confirmed BPH) and total energy and protein, but not fat intake.[42] There is also epidemiological evidence linking BPH with metabolic syndrome (concurrent obesity, impaired glucose metabolism and diabetes, high triglyceride levels, high levels of low-density cholesterol, and hypertension).[43]

Degeneration

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Benign prostatic hyperplasia is an age-related disease. Misrepair-accumulation aging theory[44] suggests that the development of benign prostatic hyperplasia is a consequence of fibrosis and weakening of the muscular tissue in the prostate.[45] The muscular tissue is important in the functionality of the prostate, and provides the force for excreting the fluid produced by prostatic glands. However, repeated contractions and dilations of myofibers will unavoidably cause injuries and broken myofibers. Myofibers have a low potential for regeneration; therefore, collagen fibers need to be used to replace the broken myofibers. Such misrepairs make the muscular tissue weak in functioning, and the fluid secreted by glands cannot be excreted completely. Then, the accumulation of fluid in glands increases the resistance of muscular tissue during the movements of contractions and dilations, and more and more myofibers will be broken and replaced by collagen fibers.[46]

Pathophysiology

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Benign prostate hyperplasia

As men age, the enzymes aromatase and 5-alpha reductase increase in activity. These enzymes are responsible for converting androgen hormones into estrogen and DHT, respectively. This metabolism of androgen hormones leads to a decrease in testosterone but increased levels of DHT and estrogen.

Both the glandular epithelial cells and the stromal cells (including muscular fibers) undergo hyperplasia in BPH.[2] Most sources agree that of the two tissues, stromal hyperplasia predominates, but the exact ratio of the two is unclear.[47]: 694 

Anatomically the median and lateral lobes are usually enlarged, due to their highly glandular composition. The anterior lobe has little in the way of glandular tissue and is seldom enlarged. (Carcinoma of the prostate typically occurs in the posterior lobe – hence the ability to discern an irregular outline per rectal examination). The earliest microscopic signs of BPH usually begin between the age of 30 and 50 years old in the PUG, which is posterior to the proximal urethra.[47]: 694  In BPH, the majority of growth occurs in the transition zone (TZ) of the prostate.[47]: 694  In addition to these two classic areas, the peripheral zone (PZ) is also involved to a lesser extent.[47]: 695  Prostatic cancer typically occurs in the PZ. However, BPH nodules, usually from the TZ are often biopsied anyway to rule out cancer in the TZ.[47]: 695  BPH can be a progressive growth that in rare instances leads to exceptional enlargement.[48] In some males, the prostate enlargement exceeds 200 to 500 grams.[48] This condition has been defined as giant prostatic hyperplasia (GPH).[48]

Diagnosis

[edit]

The clinical diagnosis of BPH is based on a history of LUTS (lower urinary tract symptoms), a digital rectal exam, and the exclusion of other causes of similar signs and symptoms. The degree of LUTS does not necessarily correspond to the size of the prostate. An enlarged prostate gland on rectal examination that is symmetric and smooth supports a diagnosis of BPH.[2] However, if the prostate gland feels asymmetrical, firm, or nodular, this raises concern for prostate cancer.[2]

Validated questionnaires such as the American Urological Association Symptom Index (AUA-SI), the International Prostate Symptom Score (I-PSS), and more recently the UWIN score (urgency, weak stream, incomplete emptying, and nocturia) are useful aids to making the diagnosis of BPH and quantifying the severity of symptoms.[2][49][50]

Laboratory investigations

[edit]

Urinalysis is typically performed when LUTS are present and BPH is suspected to evaluate for signs of a urinary tract infection, glucose in the urine (suggestive of diabetes), or protein in the urine (suggestive of kidney disease).[2] Bloodwork including kidney function tests and prostate specific antigen (PSA) are often ordered to evaluate for kidney damage and prostate cancer, respectively.[2] However, checking blood PSA levels for prostate cancer screening is controversial and not necessarily indicated in every evaluation for BPH.[2] Benign prostatic hyperplasia and prostate cancer are both capable of increasing blood PSA levels and PSA elevation is unable to differentiate these two conditions well.[2] If PSA levels are checked and are high, then further investigation is warranted. Measures including PSA density, free PSA, rectal examination, and transrectal ultrasonography may help determine whether a PSA increase is due to BPH or prostate cancer.[2]

Imaging and other investigations

[edit]

Uroflowmetry is done to measure the rate of urine flow and total volume of urine voided when the subject is urinating.[51]

Abdominal ultrasound examination of the prostate and kidneys is often performed to rule out hydronephrosis and hydroureter. Incidentally, cysts, tumours, and stones may be found on ultrasound. Post-void residual volume of more than 100 ml may indicate significant obstruction.[52] Prostate size of 30 cc or more indicates enlargement of the prostate.[53]

Prostatic calcification can be detected through transrectal ultrasound (TRUS). Calcification is due to solidification of prostatic secretions or calcified corpora amylacea (hyaline masses on the prostate gland). Calcification is also found in a variety of other conditions such as prostatitis, chronic pelvic pain syndrome, and prostate cancer.[54][55] For those with elevated levels of PSA, TRUS guided biopsy is performed to take a sample of the prostate for investigation.[56] Although MRI is more accurate than TRUS in determining prostate volume, TRUS is less expensive and almost as accurate as MRI. Therefore, TRUS is still preferred to measure prostate volume.[57]

Differential diagnosis

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Medical conditions

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The differential diagnosis for LUTS is broad and includes various medical conditions, neurologic disorders, and other diseases of the bladder, urethra, and prostate such as bladder cancer, urinary tract infection, urethral stricture, urethral calculi (stones), chronic prostatitis, and prostate cancer.[2] Neurogenic bladder can cause urinary retention and cause symptoms similar to those of BPH. This may occur as a result of uncoordinated contraction of the bladder muscle or impairment in the timing of bladder muscle contraction and urethral sphincter relaxation.[2] Notable causes of neurogenic bladder include disorders of the central nervous system such as Parkinson's disease, multiple sclerosis, and spinal cord injuries as well as disorders of the peripheral nervous system such as diabetes mellitus, vitamin B12 deficiency, and alcohol-induced nerve damage.[2] Individuals affected by heart failure often experience nighttime awakenings to urinate due to redistribution of fluid accumulated in swollen legs.[2]

Medications

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Certain medications can increase urination difficulties by increasing bladder outlet resistance due to increased smooth muscle tone at the prostate or bladder neck and contribute to LUTS.[2] Alpha-adrenergic agonist medications, such as decongestants with pseudoephedrine can increase bladder outlet resistance.[2] In contrast, calcium channel blockers and anticholinergic medications can worsen urinary retention by promoting bladder muscle relaxation.[2] Diuretic medications such as loop diuretics (e.g., furosemide) or thiazides (e.g., chlorthalidone) can cause or worsen urinary frequency and nighttime awakenings to urinate.[2]

Management

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When treating and managing benign prostatic hyperplasia, the aim is to prevent complications related to the disease and improve or relieve symptoms.[58] Approaches used include lifestyle modifications, medications, catheterization, and surgery.

Lifestyle

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If you suffer symptoms, gradually train your bladder. Hold on when you need to pee and delay for longer each time. Do this slowly over several weeks. Try to pee in succession. This is where you wait a few moments after you have finished peeing and try again. It can help you empty your bladder properly. Use pads or a sheath to absorb leaks or dribbles. Pads can be worn inside underwear or replace underwear. Try to maintain a healthy weight. Being overweight can make your symptoms worse. If you have dribbling after peeing. Pelvic floor exercises can help. Manually push out the last few drops of urine (pee). After peeing, wait a few seconds, place your fingertips behind your scrotum, and gently massage forwards and upwards. Repeat twice.
Things that you can try if you have symptoms of an enlarged prostate, according to the NHS in England.[11]
Drink fewer drinks with artificial sweeteners, and drink less alcohol. These can affect the bladder. Avoid caffeine completely. Caffeine can irritate the bladder lining which can make you want to pee urgently and cause leakage. It can take 4 – 6 weeks of completely avoiding caffeine to see a difference in symptoms. Fruit juices can sometimes make symptoms worse. This is because they are acidic and can irritate the bladder, especially if you have had prostate surgery. Avoid being constipated. It can put pressure on your bladder. Include fibre in your diet such as fruit, vegetables, beans, and whole grains. Avoid medicines with decongestants or antihistamines. These can make symptoms worse.
Things to avoid if you have symptoms of an enlarged prostate, according to the NHS in England.[11]

Lifestyle alterations to address the symptoms of BPH include physical activity,[4] decreasing fluid intake before bedtime, moderating the consumption of alcohol and caffeine-containing products, and following a timed voiding schedule.

Patients can also attempt to avoid products and medications with anticholinergic properties that may exacerbate urinary retention symptoms of BPH, including antihistamines, decongestants, opioids, and tricyclic antidepressants; however, changes in medications should be done with input from a medical professional.[59]

Physical activity

[edit]

Physical activity has been recommended as a treatment for urinary tract symptoms. A 2019 Cochrane review of six studies involving 652 men assessing the effects of physical activity alone, and physical activity as a part of a self-management program, among others. However, the quality of evidence was very low and therefore it remains uncertain whether physical activity is helpful in men experiencing urinary symptoms caused by benign prostatic hyperplasia.[60]

Voiding position

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Voiding position when urinating may influence urodynamic parameters (urinary flow rate, voiding time, and post-void residual volume).[61] A meta-analysis found no differences between the standing and sitting positions for healthy males, but that, for elderly males with lower urinary tract symptoms, voiding in the sitting position-- [62]

  • decreased the post-void residual volume;
  • increased the maximum urinary flow, comparable with pharmacological intervention; and
  • decreased the voiding time.

This urodynamic profile is associated with a lower risk of urologic complications, such as cystitis and bladder stones.

Medications

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The two main medication classes for BPH management are alpha blockers and 5α-reductase inhibitors.[63]

Alpha-blockers

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Selective α1-blockers are the most common choice for initial therapy.[64][65][66] They include alfuzosin,[67][68] doxazosin,[69] silodosin, tamsulosin, terazosin, and naftopidil.[58] They have a small to moderate benefit at improving symptoms.[70][58][71] Selective alpha-1 blockers are similar in effectiveness but have slightly different side effect profiles.[70][58][71] Alpha blockers relax smooth muscle in the prostate and the bladder neck, thus decreasing the blockage of urine flow. Common side effects of alpha-blockers include orthostatic hypotension (a head rush or dizzy spell when standing up or stretching), ejaculation changes, erectile dysfunction,[72] headaches, nasal congestion, and weakness. For men with LUTS due to an enlarged prostate, the effects of naftopidil, tamsulosin, and silodosin on urinary symptoms and quality of life may be similar.[58] Naftopidil and tamsulosin may have similar levels of unwanted sexual side effects but fewer unwanted side effects than silodosin.[58]

Tamsulosin and silodosin are selective α1 receptor blockers that preferentially bind to the α1A receptor in the prostate instead of the α1B receptor in the blood vessels. Less-selective α1 receptor blockers such as terazosin and doxazosin may lower blood pressure. The older, less selective α1-adrenergic blocker prazosin is not a first-line choice for either high blood pressure or prostatic hyperplasia; it is a choice for patients who present with both problems at the same time. The older, broadly non-selective alpha-blocker medications such as phenoxybenzamine are not recommended for control of BPH.[73] Non-selective alpha-blockers such as terazosin and doxazosin may also require slow dose adjustments as they can lower blood pressure and cause syncope (fainting) if the response to the medication is too strong.

5α-reductase inhibitors

[edit]

The 5α-reductase inhibitors finasteride and dutasteride may also be used in people with BPH.[74] These medications inhibit the 5α-reductase enzyme, which, in turn, inhibits the production of DHT, a hormone responsible for enlarging the prostate. Effects may take longer to appear than alpha blockers, but they persist for many years.[75] When used together with alpha-blockers, no benefit was reported in short-term trials, but in a longer-term study (3–4 years) there was a greater reduction in BPH progression to acute urinary retention and surgery than with either agent alone, especially in people with more severe symptoms and larger prostates.[76][77][78] Other trials have confirmed reductions in symptoms, within 6 months in one trial, an effect that was maintained after withdrawal of the alpha blocker.[77][79] Side effects include decreased libido and ejaculatory or erectile dysfunction.[80][81] The 5α-reductase inhibitors are contraindicated in pregnant women because of their teratogenicity due to interference with fetal testosterone metabolism, and as a precaution, pregnant women should not handle crushed or broken tablets.[82]

The effectiveness of alpha-blockers and 5-ARIs, and a combination of the two, versus placebo pills, in improving symptoms of an enlarged prostate.[83][84][85] Graphic from NHS England.[11]
The frequency of side effects from alpha-blockers and 5-ARIs.[83][84][85][86][87][88] Graphic from NHS England.[11]

Phosphodiesterase inhibitors (PDE)

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A 2018 Cochrane review of studies on men over 60 with moderate to severe lower urinary tract symptoms analyzed the impacts of phosphodiesterase inhibitors (PDE) in comparison to other drugs.[89] These drugs may improve urinary symptoms slightly and reduce urinary bother but may also cause more side effects than placebo. The evidence in this review found that there is probably no difference between PDE and alpha blockers, however when used in combination they may provide a greater improvement in symptoms (with more side effects). PDE also likely improves symptoms when used with 5-alpha reductase inhibitors.

Several phosphodiesterase-5 inhibitors are also effective but may require multiple doses daily to maintain adequate urine flow.[90][91] Tadalafil, a phosphodiesterase-5 inhibitor, was considered then rejected by NICE in the UK for the treatment of symptoms associated with BPH.[92] In 2011, the U.S. Food and Drug Administration approved tadalafil to treat the signs and symptoms of benign prostatic hyperplasia, and for the treatment of BPH and erectile dysfunction (ED), when the conditions occur simultaneously.[93]

Others

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Antimuscarinics such as tolterodine may also be used, especially in combination with alpha-blockers.[94] They act by decreasing acetylcholine effects on the smooth muscle of the bladder, thus helping control symptoms of an overactive bladder.[95]

Self-catheterization

[edit]

Intermittent urinary catheterization is used to relieve the bladder in people with urinary retention. Self-catheterization is an option in BPH when it is difficult or impossible to empty the bladder.[96] Urinary tract infection is the most common complication of intermittent catheterization.[97] Several techniques and types of catheter are available, including sterile (single-use) and clean (multiple use) catheters, but, based on current information, none is superior to others in reducing the incidence of urinary tract infection.[98]

Surgery

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Main article: Surgery for benign prostatic hyperplasia
Transurethral resection of the prostate (TURP)

If medical treatment is not effective, surgery may be performed. Surgical techniques used include the following:

Other less invasive surgical approaches (requiring spinal anesthesia) include:

Minimally invasive procedures

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Some less invasive procedures are available according to patients' preferences and co-morbidities. These are performed as outpatient procedures with local anesthesia.

The effectiveness of different surgeries and minimally-invasive procedures for enlarged prostate.[105][106][107][108][109][110][111][112][113][114][115][116][117][118][119][120][121][122][123][124][125][126][127][128][129][130][131] Graphic from NHS England.[11]
The outcomes from different surgeries and minimally-invasive procedures for enlarged prostate.Graphic from NHS England.[11]
Frequencies of side-effects from different surgeries and minimally-invasive procedures for enlarged prostate.[132][88][133][134][135][106][120][136][110][137][138][139][117][140][141][142][121][143][126][105][144][113][145][111][146][131][147][130][115][114][148][149][150][151][116][152][153] Graphic from NHS England.[11]

Alternative medicine

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While herbal remedies are commonly used, a 2016 review found the herbs studied to be no better than placebos.[154] Particularly, several reviews found that saw palmetto extract, while one of the most commonly used, is no better than a placebo both in symptom relief and in decreasing prostate size.[155][156][157]

Epidemiology

[edit]
Disability-adjusted life year for benign prostatic hyperplasia per 100,000 inhabitants in 2004[158]
  no data
  less than 20
  20–28
  28–36
  36–44
  44–52
  52–60
  60–68
  68–76
  76–84
  84–92
  92–100
  more than 100

Globally, benign prostatic hyperplasia affects about 94 million males as of 2019.[3]

The prostate gets larger in most men as they get older. For a symptom-free man of 46 years, the risk of developing BPH over the next 30 years is 45%. Incidence rates increase from 3 cases per 1000 man-years at age 45–49 years, to 38 cases per 1000 man-years by the age of 75–79 years. While the prevalence rate is 2.7% for men aged 45–49, it increases to 24% by the age of 80 years.[159]

References

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[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Benign prostatic hyperplasia

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from Grokipedia
Benign prostatic hyperplasia (BPH), also known as benign prostatic enlargement, is a nonmalignant condition characterized by the progressive growth of the prostate gland, which surrounds the urethra and can obstruct urinary flow, leading to lower urinary tract symptoms (LUTS) in affected men.[1][2] BPH is the most common prostate problem in men older than age 50. The histologic prevalence of BPH increases with age, reaching approximately 50% in men aged 51–60 years and up to 90% in those over 80 years.[3] The condition arises primarily from the proliferation of stromal and epithelial cells in the prostate's transition zone. While androgens, particularly dihydrotestosterone (DHT), are necessary for normal prostate growth and development, high circulating testosterone levels do not cause BPH; higher endogenous testosterone levels are associated with smaller prostate volume and lower risk of BPH, whereas BPH prevalence increases with age as testosterone levels naturally decline. The etiology remains multifactorial and not fully understood.[4][5] Risk factors include advancing age, family history (with heritability estimates of 39%–72%, indicating genetic factors explain much of the variation in susceptibility), diabetes, cardiovascular disease, and obesity, while protective factors may include physical activity and certain dietary patterns.[6][7] The hallmark symptoms of BPH are related to bladder outlet obstruction and include urinary frequency, urgency, nocturia (waking at night to urinate), a weak or interrupted urine stream, straining to urinate, dribbling after urination, and a sensation of incomplete bladder emptying.[6][8] In severe cases, complications such as acute urinary retention, urinary tract infections, bladder stones, hematuria, or renal damage can occur if untreated.[1] Diagnosis typically involves a medical history, physical examination including digital rectal exam, symptom scoring (e.g., International Prostate Symptom Score), urinalysis, prostate-specific antigen (PSA) testing, and possibly urodynamic studies or imaging to rule out other conditions like prostate cancer.[2] Management of BPH is tailored to symptom severity and patient preferences, beginning with watchful waiting or lifestyle modifications for mild cases, progressing to pharmacological therapies such as alpha-blockers (e.g., tamsulosin) to relax prostate muscles or 5-alpha reductase inhibitors (e.g., finasteride) to shrink the gland.[9][3] For moderate to severe symptoms unresponsive to medications, minimally invasive surgical therapies (MISTs) or procedures like transurethral resection of the prostate (TURP) are recommended, with guidelines emphasizing shared decision-making to balance efficacy, risks, and quality of life.[3][10] Although BPH itself does not increase prostate cancer risk, elevated PSA levels from the condition necessitate careful monitoring.[1]

Clinical Presentation

Signs and Symptoms

In men with BPH, prostate volumes commonly exceed 30 cc, with averages around 40-50 cc in those in their 70s, and higher in severe cases. This enlargement, primarily in the transition zone, leads to urethral compression and lower urinary tract symptoms. Benign prostatic hyperplasia (BPH) is characterized by lower urinary tract symptoms (LUTS), which are broadly divided into storage and voiding categories. The symptoms of BPH are often intermittent, can fluctuate in severity, and frequently come and go. They typically vary from day to day or over longer periods, influenced by factors such as fluid intake (dehydration can exacerbate urinary frequency and urgency by producing concentrated urine that irritates the bladder lining, worsening bladder sensitivity and urgency; proper hydration may help alleviate irritation-related frequency and urgency, but does not cause or exacerbate weak stream, which is due to prostatic obstruction and requires evaluation for prostate issues), caffeine or alcohol consumption, certain medications, urinary tract infections, or other triggers. Although BPH tends to progress gradually, leading to worsening symptoms in many cases over time, the symptoms are not invariably constant.[6][2][11] Storage symptoms involve urinary urgency, increased daytime frequency (more than eight times per day), and nocturia, defined as waking two or more times at night to void, affecting 50% to 80% of older men with BPH.[6][2][11] Voiding symptoms include hesitancy (delay in starting urination), a weak or diminished stream, intermittency (stopping and starting during voiding), and a sensation of incomplete emptying, often leading to straining or prolonged urination.[6][2][1] A severe and potentially emergent symptom is acute urinary retention, marked by the sudden inability to void despite a full bladder, typically accompanied by lower abdominal pain, bloating, and restlessness.[2][1] Less frequently, patients experience hematuria (blood in urine), recurrent urinary tract infections due to post-void residual urine from obstruction, and sexual dysfunction, particularly ejaculatory disorders such as reduced volume, retrograde ejaculation, or painful ejaculation, reported in up to 48% of affected men.[1][12][13] Symptom severity is evaluated using the International Prostate Symptom Score (IPSS), a self-administered tool with seven questions assessing the frequency of LUTS over the past month, each scored from 0 (not at all) to 5 (almost always), yielding a total score of 0-35; an additional quality-of-life question is scored separately from 0-6.[3][1] IPSS scores are categorized as mild (0-7), moderate (8-19), or severe (20-35), guiding clinical assessment of symptom burden.[14][15] These symptoms profoundly affect daily life, with nocturia disrupting sleep and causing fatigue, irritability, and impaired productivity, while overall LUTS contribute to psychological distress including anxiety and reduced emotional well-being.[1][16][17]

Complications

Benign prostatic hyperplasia (BPH) can lead to acute urinary retention (AUR), characterized by a sudden and painful inability to void despite a full bladder, often requiring emergent catheterization, with an annual incidence of approximately 0.5% (5 per 1,000) in men with BPH. See the Management section for details on the management of AUR, including initial catheterization, alpha-blockers to facilitate trial without catheter, and surgical intervention.[18] This complication arises from progressive urethral compression by the enlarged prostate.[19] Chronic urinary retention (CUR), a more insidious form, involves incomplete bladder emptying over time, leading to elevated post-void residual volumes and increased intravesical pressure.[1] Risks associated with catheterization for AUR or CUR include urinary tract infections, urethral trauma, and, for suprapubic approaches, complications such as tube dislodgement or bowel perforation.[20] Recurrence rates of AUR are high, with studies reporting 56-64% within one week and up to 76-83% over longer periods in untreated BPH cases.[21] Recurrent urinary tract infections (UTIs) frequently complicate BPH due to urinary stasis in the bladder from obstruction, promoting bacterial colonization and biofilm formation.[18] Pathogenesis involves incomplete voiding that allows pathogens like Escherichia coli to proliferate in residual urine, with a significant proportion of BPH patients at risk for UTIs as a result.[22] These infections are often complicated, exhibiting higher rates of antibiotic resistance, particularly to fluoroquinolones, due to recurrent exposure and selection pressure in obstructed systems.[23] Bladder dysfunction in BPH progresses through stages of adaptation to outlet obstruction, beginning with detrusor hypertrophy where smooth muscle thickens to generate higher pressures for voiding.[24] Prolonged obstruction leads to decompensation, characterized by detrusor underactivity, reduced contractility, and impaired emptying, often resulting in overflow incontinence.[25] This can coexist with or evolve into overactive bladder syndrome, driven by detrusor instability and involuntary contractions, exacerbating urgency and frequency.[26] Backpressure from untreated retention can cause hydronephrosis, dilation of the renal pelvis and calyces due to vesicoureteral reflux or ureteral obstruction.[1] This chronic process contributes to renal impairment, with BPH-linked obstruction implicated in progression to chronic kidney disease (CKD), particularly stages 3-5, through mechanisms like tubular atrophy and interstitial fibrosis.[27] Recurrent UTIs and elevated bladder pressures further accelerate CKD advancement in affected patients.[18] Bladder stone formation occurs secondary to urinary stasis and precipitation of minerals like calcium oxalate in residual urine, often requiring intervention in advanced BPH.[2] Hematuria in BPH stems from vascular engorgement and friability of prostatic veins under obstructive strain, presenting as gross or microscopic blood in urine. More specifically, the enlarged prostate develops hypervascular tissue with delicate, fragile blood vessels that can rupture due to increased intra-abdominal or pelvic pressure from triggers such as strenuous physical exercise, heavy lifting, straining during bowel movements, or forceful urination. This mechanism often results in visible (gross) hematuria, occasionally with small blood clots, even in the absence of other symptoms like pain or urinary difficulty. Conservative measures to help resolve or prevent episodes include rest and avoidance of overexertion or straining, maintaining good hydration to dilute urine, preventing constipation (e.g., via fiber intake or stool softeners), and avoiding bladder irritants like caffeine, alcohol, and NSAIDs unless approved by a physician. Monitoring for trends in bleeding intensity is advised, with prompt medical follow-up if persistent. Per AUA guidelines, after exclusion of other causes of hematuria (e.g., via cystoscopy ruling out malignancy, stones, or infection), 5-alpha reductase inhibitors (5-ARIs) such as finasteride or dutasteride may be an appropriate and effective treatment for refractory hematuria presumably due to prostatic bleeding. These agents shrink the prostate over time, reduce vascular density, and help control recurrent episodes, often used when bleeding does not resolve conservatively.[28][29] Rare complications include bladder diverticula, outpouchings of the bladder wall formed by high intravesical pressures herniating through detrusor muscle defects, observed in approximately 6% of obstructive BPH cases.[30] Squamous metaplasia of the bladder epithelium may arise from chronic irritation due to stasis, infection, or stones, potentially increasing risks for further pathologic changes.[31]

Etiology

Risk Factors

Age is the strongest risk factor for benign prostatic hyperplasia (BPH), with the condition rarely occurring before age 40 and prevalence increasing markedly thereafter.[6] Histopathologic evidence of BPH is found in approximately 50% of men by age 60 and rises to 90% by age 85.[32] The prevalence is less than 10% in men under 40 but exceeds 80% in those over 80, reflecting progressive glandular enlargement over time.[33] Family history and genetic predisposition significantly contribute to BPH risk, with heritability estimated at 40-70% in affected cases.[34] Specific genetic variants, such as polymorphisms in the SRD5A2 gene (e.g., rs9282858 A49T), have been associated with increased susceptibility, particularly in certain populations, as shown in meta-analyses.[35] Components of metabolic syndrome, including obesity (BMI >30), diabetes, hypertension, and dyslipidemia, are established risk factors for BPH. Meta-analyses indicate that obesity elevates BPH risk with odds ratios of 1.5-2.0, while diabetes and hypertension independently increase odds by approximately 1.3-1.6.[36][37] These associations are attributed to shared inflammatory and insulin-resistant pathways that promote prostatic growth.[38] Lifestyle factors such as sedentary behavior and low physical activity levels heighten BPH risk, with Mendelian randomization studies confirming a causal link to prolonged sitting.[39] Regular physical activity, conversely, shows an inverse relationship, reducing BPH prevalence by up to 25% in high-exercise cohorts after adjusting for confounders.[40] Smoking exhibits inconsistent associations, though cumulative pack-years may correlate with symptom severity in some longitudinal data.[41] Limited data suggest possible racial and ethnic differences in BPH rates, with some studies indicating higher prevalence or earlier diagnosis in African American and Hispanic men compared to whites (relative risk up to 1.41 for blacks in certain analyses), and lower incidence in Asian populations, particularly East Asians, potentially due to genetic and dietary factors; however, authoritative guidelines note a paucity of robust evidence on these variations.[42][43][3] Cardiovascular disease acts as a comorbidity risk amplifier for BPH, with shared risk factors like hypertension doubling the likelihood of prostatic enlargement.[44] Men with cardiovascular conditions face 1.5-2.0 times higher odds of BPH progression, underscoring the interplay between vascular health and prostate pathology.[45]

Hormonal Mechanisms

Benign prostatic hyperplasia (BPH) is fundamentally driven by androgen signaling, with dihydrotestosterone (DHT) playing a central role in prostatic growth. DHT is produced from testosterone through the action of the enzyme 5α-reductase, which exists as two main isoenzymes in human tissues: type 1, predominantly expressed in the liver and skin, and type 2, which is the primary form in the prostate stroma and epithelium.[46] Type 2 5α-reductase is highly active in prostatic tissue, facilitating the local accumulation of DHT, which binds with high affinity to the androgen receptor, thereby stimulating epithelial and stromal cell proliferation and inhibiting apoptosis.[47] This androgen-dependent mechanism is essential for prostate development during puberty but persists into adulthood, contributing to the hyperplastic growth observed in BPH.[48] Although testosterone and DHT are essential for normal prostate development and tissue maintenance, high systemic levels of testosterone do not cause or promote BPH. Observational studies indicate that higher endogenous serum testosterone concentrations are associated with smaller prostate volumes and reduced risk of BPH progression, whereas BPH prevalence and prostate enlargement increase with advancing age concurrent with the natural decline in testosterone levels. Factors such as aging-related changes, inflammation, and alterations in local intraprostatic hormone metabolism predominate in BPH pathogenesis.[4][49] Furthermore, testosterone replacement therapy in hypogonadal men does not typically worsen BPH or lower urinary tract symptoms and may improve symptoms in some cases, as demonstrated by randomized clinical trials and observational studies.[50][49] Aging disrupts the balance between androgens and estrogens, further promoting BPH pathogenesis. In older men, increased aromatase activity in prostatic stromal cells converts circulating testosterone to estradiol, elevating local estrogen levels while systemic androgens decline.[48] This estrogen-androgen imbalance favors estrogen receptor signaling, which induces stromal proliferation and nodule formation in the prostate transition zone, exacerbating hyperplasia.[51] Experimental evidence from aromatase inhibitor studies demonstrates that blocking this conversion prevents prostatic hyperplasia, underscoring the mechanistic importance of estrogens in age-related BPH progression.[51] Growth factors such as insulin-like growth factor-1 (IGF-1) interact with hormonal pathways to amplify hyperplastic responses in BPH. IGF-1, produced by prostatic stromal cells, binds to IGF-1 receptors on epithelial cells, activating downstream signaling cascades like PI3K/Akt that promote cell survival, proliferation, and inhibition of apoptosis.[36] Elevated IGF-1 levels and receptor activation have been observed in BPH tissues compared to normal prostate, with epidemiological studies linking higher circulating IGF-1 to increased BPH risk, particularly in men with severe symptoms.[52] This signaling is modulated by androgens, forming a synergistic loop that sustains hyperplasia.[53] Dysregulation of the hypothalamic-pituitary-gonadal (HPG) axis in aging men contributes to these hormonal shifts. After age 50, reduced hypothalamic secretion of gonadotropin-releasing hormone (GnRH) leads to diminished luteinizing hormone (LH) pulses from the pituitary, resulting in lower testosterone production by Leydig cells, while follicle-stimulating hormone (FSH) levels often rise due to impaired feedback.[54] These changes create a permissive environment for BPH by altering androgen availability and exacerbating estrogen dominance.[55] Evidence from both human clinical trials and animal models confirms the causal role of DHT in BPH. Selective inhibition of 5α-reductase type 2 with finasteride reduces intraprostatic DHT by about 70-90%, leading to prostate volume decreases of 20-30% over 1-4 years, as demonstrated in the Proscar Long-term Efficacy and Safety Study (PLESS) and other long-term trials.[56] Dual inhibition with dutasteride, targeting both isoenzymes, achieves similar volume reductions of up to 26% after 4 years in men with enlarged prostates.[57] In rodent models, such as testosterone-induced BPH in rats, 5α-reductase blockade similarly attenuates prostate growth by 25-30%, supporting the translational relevance of these findings.[58]

Other Contributing Factors

Dietary patterns have been implicated in the etiology of benign prostatic hyperplasia (BPH), with high intake of red meat and saturated fats associated with increased risk. Studies indicate that consumption of red and processed meats elevates the likelihood of symptomatic BPH, potentially through mechanisms involving inflammation and oxidative damage induced by heme iron and advanced glycation end-products. Similarly, diets rich in animal fats and total fats have shown links to higher BPH incidence, with relative risks estimated between 1.2 and 1.5 in cohort analyses. In contrast, higher consumption of vegetables, fruits, and whole grains appears protective, likely due to their antioxidant and anti-inflammatory compounds. Lycopene, found in tomatoes, and soy isoflavones have demonstrated potential risk reduction, with epidemiological data suggesting up to 20-30% lower odds of BPH progression in men with high intake of these nutrients.[59][60][61] Chronic inflammation and oxidative stress contribute significantly to BPH development, often manifesting as prostatitis-like symptoms such as pelvic pain and urinary irritation. Proinflammatory cytokines, including interleukin-6 (IL-6) and tumor necrosis factor-alpha (TNF-α), are elevated in prostatic tissue of affected men, promoting stromal proliferation and inhibiting apoptosis. Oxidative stress exacerbates this by generating reactive oxygen species that damage cellular components, leading to chronic tissue remodeling. Evidence from histological studies shows that men with BPH frequently exhibit inflammatory infiltrates and elevated markers of oxidative damage, linking these processes to disease initiation independent of hormonal influences.[62][63][64] Vascular factors, including endothelial dysfunction and prostatic ischemia, play a role in BPH pathogenesis by fostering nodular growth through hypoxia-driven pathways. Endothelial impairment reduces nitric oxide bioavailability, impairing vasodilation and leading to localized ischemia in the prostate, which activates hypoxia-inducible factors that stimulate cell proliferation. Clinical observations associate cardiovascular risk factors like hypertension and atherosclerosis with higher BPH prevalence, suggesting that vascular aging contributes to glandular hyperplasia. Studies in animal models confirm that induced prostatic ischemia promotes hyperplastic changes, highlighting ischemia as a non-hormonal driver.[65][66][67] Certain medications and environmental exposures may influence BPH risk, though evidence remains mixed and often derived from occupational cohorts. Beta-blockers, used for hypertension, have shown inconsistent associations with BPH symptoms, with some reports of potential exacerbation due to effects on smooth muscle tone, but large-scale studies indicate no significant causal link. Occupational exposures to chemicals, such as toxic metals (e.g., cadmium, lead) and pesticides, are linked to elevated BPH odds, with an odds ratio of 1.39 for non-substantial metal exposure in epidemiological surveys. Air pollutants like particulate matter have also been correlated with increased BPH incidence in urban populations, possibly via inflammatory cascades. These findings underscore the need for further prospective research to clarify dose-response relationships.[1][68][69] Degenerative changes in the prostate, including apoptosis dysregulation and altered epithelial-stromal interactions, contribute to BPH beyond endocrine factors. Dysregulated apoptosis leads to an imbalance favoring cell accumulation, with reduced programmed cell death in both epithelial and stromal compartments observed in hyperplastic tissue. Epithelial-stromal paracrine signaling, involving growth factors like transforming growth factor-beta, promotes fibrosis and hyperplasia through dysregulated interactions that sustain proliferation. These processes are evidenced in histopathological analyses showing disrupted tissue architecture and elevated fibrotic markers in BPH specimens.[70][71][72] Some research indicates associations with mineral imbalances, such as an elevated calcium-to-magnesium (Ca/Mg) ratio in men with BPH. A study reported this imbalance in 80% of BPH cases, potentially linked to disease presence, though causality and clinical significance remain under investigation.[73]

Pathophysiology

Cellular and Molecular Processes

Benign prostatic hyperplasia (BPH) is characterized primarily by hyperplasia, an increase in the number of cells, rather than hypertrophy, which involves enlargement of individual cells, particularly within the transition zone of the prostate.[74] This proliferation is driven by the activation of stem and progenitor cells, such as luminal progenitor cells, which exhibit enhanced stemness and are enriched in BPH tissues compared to normal prostate epithelium.[75] These cells demonstrate higher activity in stem-related pathways and contribute to the expansion of epithelial compartments in the transition zone, where BPH nodules predominantly form.[76] Key intracellular signaling pathways promote cell survival and proliferation in BPH. The PI3K/Akt pathway is overexpressed in prostatic tissues from BPH patients, leading to reduced apoptosis and increased prostate size through downstream effects on cell growth.[77] Similarly, activation of the Wnt/β-catenin pathway occurs via upregulation of β-catenin nuclear translocation, which enhances expression of proliferative genes such as c-MYC and survivin, fostering epithelial-mesenchymal transition and fibrosis in BPH.[78] Oxidative stress plays a significant role in BPH pathophysiology, with elevated reactive oxygen species (ROS) contributing to chronic inflammation, fibrosis, and cell proliferation. This involves dysregulation of antioxidants like peroxiredoxin 3 and activation of pathways such as NF-κB, exacerbating hyperplastic growth as of 2025.[79][70] Alterations in gene expression further support BPH progression. The androgen receptor (AR) is upregulated in prostatic stromal cells exposed to hormonal influences, correlating with increased expression of growth factors like FGF-2 and FGF-7 that drive stromal proliferation.[80] Prostate-specific genes, including PSA (prostate-specific antigen), are also upregulated due to enhanced AR signaling, contributing to the secretory phenotype of hyperplastic cells.[74] Epigenetic modifications play a critical role in sustaining these changes. DNA hypermethylation and histone post-translational alterations, such as acetylation and methylation patterns, are observed in BPH tissues, leading to aberrant gene silencing or activation that favors proliferation over normal regulation.[81] These modifications affect genes involved in cell cycle control and are more pronounced in hyperplastic regions compared to normal prostate. Resistance to programmed cell death is a hallmark of BPH, mediated by overexpression of the anti-apoptotic protein Bcl-2 in epithelial cells.[82] This upregulation persists even after androgen deprivation, preventing apoptosis and allowing sustained accumulation of hyperplastic cells, in contrast to normal or malignant prostate tissues that respond with cell death.[82]

Structural Changes in the Prostate

Benign prostatic hyperplasia (BPH) primarily affects the transition zone of the prostate, leading to nodular hyperplasia that expands this region while typically sparing the peripheral zone.[1] The transition zone, located around the urethra, undergoes proliferation of both stromal and epithelial components, resulting in discrete nodules that compress the urethral lumen.[83] Histologically, BPH is characterized by glandular and stromal hyperplasia, with an imbalance favoring stromal elements in many cases, accompanied by varying degrees of fibrosis and calcification within the hyperplastic nodules.[83] Fibrosis arises from chronic inflammation and extracellular matrix deposition, contributing to tissue stiffness, while calcifications often form in corpora amylacea or glandular lumina, reflecting degenerative changes.[84][85] Prostate volume typically increases progressively in BPH, with normal glands weighing less than 30 g and hyperplastic prostates often exceeding this threshold, as measured accurately by transrectal ultrasound (TRUS).[86] This enlargement correlates with the degree of urethral compression and is a key indicator of disease progression.[1] Bladder outlet obstruction in BPH results from both static and dynamic components: the static element stems from the mechanical bulk of hyperplastic tissue narrowing the urethra, while the dynamic component involves increased smooth muscle tone in the prostate stroma, exacerbating resistance to urinary flow.[1] These factors combine to impede bladder emptying without involving detrusor dysfunction.[3] Vascular remodeling in BPH nodules includes enhanced angiogenesis driven by hypoxia-inducible factors, leading to new vessel formation that supports hyperplastic growth, alongside localized hypoxia within densely packed tissues.[87] This remodeling maintains nodule viability but may contribute to sustained proliferation.[88]

Diagnosis

Medical History and Physical Exam

The initial evaluation of suspected benign prostatic hyperplasia (BPH) begins with a comprehensive medical history to characterize lower urinary tract symptoms (LUTS) and identify potential contributing factors. Clinicians should inquire about the duration and progression of symptoms, such as urinary frequency, urgency, weak stream, hesitancy, nocturia, and incomplete emptying, which are hallmark features of obstructive and irritative LUTS associated with BPH.[1] To quantify symptom severity and impact on quality of life, the International Prostate Symptom Score (IPSS) questionnaire is routinely administered, consisting of seven questions scored from 0 to 5 each, with a total score ranging from 0 (no symptoms) to 35 (severe symptoms); a score of 8 or higher indicates moderate to severe symptoms.[89] Additionally, sexual history is elicited, including details on erectile dysfunction or ejaculatory issues, as these may influence treatment choices and are common comorbidities in BPH patients.[89] Comorbidities such as diabetes mellitus, which can exacerbate LUTS through autonomic neuropathy or polyuria, should be reviewed, along with current medications (e.g., diuretics or anticholinergics) that might worsen symptoms.[90] Red flag questions are essential to screen for alternative or coexisting pathologies. For suspected prostate malignancy, inquiries should target unexplained weight loss, bone pain, or gross hematuria, which may indicate advanced disease rather than benign enlargement.[1] To identify neurogenic causes, such as spinal cord injury or cauda equina syndrome, clinicians assess for history of back trauma, lower extremity weakness, or sensory deficits in the perineal region.[1] These elements help differentiate BPH from more urgent conditions requiring immediate referral. The physical examination focuses on abdominal, genital, and neurological assessments to corroborate history findings. A digital rectal examination (DRE) is performed with the patient in the lateral or lithotomy position; a gloved, lubricated index finger is gently inserted into the rectum to palpate the prostate anteriorly through the rectal wall.[91] Prostate size is estimated by comparing to common objects—normal is walnut-sized (approximately 20-25 grams), while BPH often presents as enlarged (up to orange-sized, >30 grams), though DRE tends to underestimate volumes exceeding 50 grams.[92] Consistency is evaluated as smooth and rubbery in BPH, contrasting with firm or nodular irregularities suggestive of malignancy; tenderness may indicate acute prostatitis.[9] Neurological assessment includes evaluation of perineal sensation to light touch and pinprick, as well as digital assessment of anal sphincter tone during DRE, to detect deficits indicative of cauda equina syndrome or other neurogenic bladder etiologies.[14] In frail elderly patients, performance status is gauged using validated tools such as the World Health Organization (WHO) performance scale (0-4, with 0 indicating fully active and 4 bedridden) or Karnofsky scale (0-100, with scores <70 denoting significant functional impairment), to assess overall fitness and guide management decisions.[93]

Laboratory and Imaging Studies

Laboratory tests play a crucial role in evaluating benign prostatic hyperplasia (BPH) by assessing prostate-specific markers, ruling out infections or hematuria, and monitoring renal function. Prostate-specific antigen (PSA) levels are commonly measured, with normal values below 4 ng/mL; however, BPH can cause mild elevations, often up to 10 ng/mL, due to increased prostate glandular tissue.[1] The free-to-total PSA ratio may also be calculated to help differentiate BPH from prostate cancer, as lower ratios suggest malignancy.[94] Urinalysis is performed to detect urinary tract infections, hematuria, or glucosuria, which could contribute to lower urinary tract symptoms.[3] Serum creatinine levels are assessed to evaluate kidney function, particularly in cases of suspected hydronephrosis from chronic obstruction.[3] Uroflowmetry provides objective measurement of urinary flow dynamics, aiding in the assessment of obstruction severity. A peak flow rate below 15 mL/s, with a voided volume of at least 150 mL, is indicative of potential bladder outlet obstruction in BPH patients.[1] Post-void residual (PVR) urine volume is measured via ultrasound; volumes greater than 100 mL are often considered elevated and suggestive of incomplete emptying, though thresholds vary.[95] Imaging modalities offer visualization of prostate anatomy and bladder effects. Transrectal ultrasound (TRUS) is widely used to estimate prostate volume using the formula: volume = length × width × height × π/6, helping to guide management decisions for prostates larger than 30 mL.[86] Magnetic resonance imaging (MRI) provides detailed zonal anatomy, distinguishing transition zone hyperplasia in BPH from peripheral zone lesions. A lobulated prostate on imaging refers to the prostate gland appearing with an irregular, multi-lobular, or nodular contour rather than a smooth, uniform shape. This is most commonly associated with benign prostatic hyperplasia (BPH), where uneven enlargement of the transition zone leads to a multinodular or lobulated appearance, often seen on ultrasound, MRI, or CT. It is generally a benign descriptive finding, though irregular or spiculated contours can sometimes raise concern for malignancy and require correlation with other features like PI-RADS scoring.[96] Cystoscopy allows direct visualization of the bladder neck and urethra to assess for structural narrowing or trabeculation.[3] Pressure-flow studies are invasive urodynamic tests that differentiate obstruction from detrusor underactivity. A detrusor pressure at maximum flow (PdetQmax) greater than 40 cmH₂O indicates significant bladder outlet obstruction in BPH.[97] Recent advancements incorporate artificial intelligence (AI) in imaging analysis for more precise prostate volume prediction and BPH characterization. AI algorithms applied to MRI and ultrasound data have achieved accuracies exceeding 90% in estimating zonal volumes and distinguishing BPH from prostate cancer, enhancing diagnostic efficiency. As of the 2025 AUA guideline updates, AI-assisted imaging analysis is increasingly integrated for enhanced precision in prostate evaluation.[98][3]

Differential Diagnosis

Benign prostatic hyperplasia (BPH) presents with lower urinary tract symptoms (LUTS) that can overlap with various other conditions, necessitating a thorough differential diagnosis to guide appropriate evaluation and avoid misdiagnosis.[1] Key mimics include prostate cancer, urethral strictures, neurogenic bladder, overactive bladder (OAB), medication-induced symptoms, and systemic medical conditions; differentiation often relies on history, physical exam, laboratory tests, and specialized imaging or urodynamic studies.[14] Prostate cancer must be excluded in men with LUTS, as it can coexist with or mimic BPH. Elevated prostate-specific antigen (PSA) levels greater than 10 ng/mL, particularly when combined with an abnormal digital rectal examination (DRE) revealing nodules or asymmetry, strongly indicate the need for prostate biopsy. On imaging (ultrasound, MRI, or CT), a lobulated or multinodular contour is characteristic of BPH due to uneven enlargement of the transition zone, whereas irregular or spiculated contours may indicate malignancy and support the need for further evaluation such as biopsy when combined with other suspicious findings (e.g., PI-RADS scoring on MRI).[96][99][100] Biopsy results are graded using the Gleason scoring system, where scores of 8 or higher suggest higher-grade malignancy requiring oncologic intervention, distinguishing it from the benign histology of BPH.[101] Benign prostatic hyperplasia (BPH) is distinct from prostate cancer: BPH results from non-cancerous proliferation of normal prostate cells, predominantly in the transition zone, leading to enlargement without malignant potential. It does not increase the risk of developing prostate cancer nor transform into it. Prostate cancer involves uncontrolled growth of malignant cells, typically originating in the peripheral zone, and can invade tissues or metastasize. While both can cause elevated PSA and LUTS, BPH-related changes are benign and non-progressive to malignancy. Urethral stricture or bladder neck contracture typically arises from prior trauma, instrumentation, or infections such as sexually transmitted diseases, presenting with obstructive LUTS similar to BPH but often with a history of recurrent urinary tract infections or prior urologic procedures.[102] Diagnosis is confirmed by cystoscopy, which visualizes the narrowing, or retrograde urethrography, allowing differentiation from prostatic enlargement by directly assessing urethral patency rather than prostate size.[103] Neurogenic bladder, often secondary to conditions like diabetes mellitus or Parkinson's disease, causes detrusor underactivity or overactivity leading to LUTS that may resemble BPH-related obstruction.[104] Urodynamic studies reveal detrusor-sphincter dyssynergia or impaired detrusor contractility, confirming neurologic etiology in contrast to the mechanical outflow obstruction seen in BPH.[105] Overactive bladder (OAB) is characterized by isolated storage symptoms such as urgency and frequency without significant post-void residual urine or obstruction, differing from the mixed voiding and storage issues in BPH.[106] Urodynamics typically show involuntary detrusor contractions during filling, supporting OAB diagnosis and ruling out BPH-related bladder outlet obstruction.[107] Certain medications, including anticholinergics (e.g., antihistamines) and diuretics, can induce secondary LUTS by altering bladder contractility or increasing urine production, mimicking BPH symptoms in older men.[108] Symptoms often resolve upon discontinuation of the offending agent, providing a key diagnostic clue distinct from persistent BPH-related obstruction.[109] Systemic medical conditions like heart failure can cause nocturia due to peripheral edema redistribution during recumbency, leading to increased nocturnal urine output that overlaps with BPH but lacks obstructive features on exam.[110] Similarly, renal calculi present with colicky flank or suprapubic pain and hematuria, contrasting the dull, chronic discomfort of BPH, and are identified via imaging such as non-contrast CT.[1]

Management

Lifestyle and Conservative Approaches

For men with mild benign prostatic hyperplasia (BPH), watchful waiting is an appropriate initial management strategy when symptoms are minimal and not impacting quality of life, typically indicated by an International Prostate Symptom Score (IPSS) less than 8, post-void residual (PVR) urine volume under 100 mL, and absence of complications such as urinary retention or recurrent infections.[3][1] This approach involves regular monitoring without active intervention, with checkups every 6-12 months assessing symptoms, PSA levels, and residual urine via ultrasound, allowing patients to avoid unnecessary treatments while tracking for progression; many patients remain stable without progression for years.[111] Lifestyle modifications play a central role in alleviating mild BPH symptoms, particularly lower urinary tract symptoms (LUTS) like nocturia and incomplete emptying. Fluid management strategies include limiting intake in the evening—ideally restricting fluids 2 to 4 hours before bedtime or avoiding fluids altogether for 1-2 hours before bedtime—and avoiding or reducing bladder irritants such as caffeine, alcohol, and spicy foods, which can exacerbate nocturia by increasing urine production and irritating the bladder lining. Adequate hydration during the day is recommended to prevent the production of concentrated urine, which can irritate the bladder lining and exacerbate irritative symptoms such as urinary frequency and urgency.[112][3] These adjustments help reduce nighttime awakenings without compromising overall hydration during the day.[113][114][9] Regular physical activity is recommended to mitigate BPH symptom severity, with moderate to vigorous aerobic exercise—such as brisk walking, biking, or other activities for at least 30 minutes most days of the week or 150 minutes per week—associated with reduced LUTS and improved quality of life, alongside avoidance of prolonged sitting.[115][116][9] Pelvic floor exercises, including Kegel contractions to strengthen and relax the muscles supporting the bladder and prostate, further aid in improving urinary control and reducing urgency.[117] Voiding techniques can enhance bladder emptying efficiency for men experiencing hesitancy or weak stream, including advising against holding urine for long periods to prevent overdistension. Double voiding involves urinating, waiting 20 to 30 seconds, and attempting a second void to ensure complete evacuation, while pelvic floor relaxation—such as deep breathing to release tension—promotes smoother flow; warm sitz baths may provide additional relief.[118] Adopting a sitting position during urination has been shown to improve uroflowmetry parameters and reduce PVR compared to standing, particularly in men with prostate enlargement.[119] Dietary adjustments support symptom management by addressing constipation and obesity, both of which can worsen LUTS, alongside weight control efforts. Evidence on diet and BPH is largely observational and not conclusive, but adherence to plant-based and Mediterranean-style diets—rich in fruits, vegetables, whole grains, legumes, nuts, olive oil, and fatty fish—is associated with lower risk or better symptom management, potentially through reduced inflammation and improved metabolic health. A high-fiber diet, incorporating fruits, vegetables (such as berries, broccoli, citrus fruits, and tomatoes), whole grains, and plant-based proteins, helps prevent straining during bowel movements that might aggravate prostate pressure. Including omega-3-rich fish supports anti-inflammatory effects; lean seafood like shrimp provides protein with low saturated fat and some omega-3 fatty acids, with studies showing no consistent link to increased BPH risk and potential neutral or protective effects—though shrimp may be less anti-inflammatory than fatty fish like salmon. In moderation, shrimp is unlikely to worsen BPH and fits better than red meat, but avoid irritating sauces (e.g., spicy, acidic, or high-sodium). Foods and beverages that may exacerbate symptoms by irritating the bladder or promoting inflammation include caffeine (coffee, tea), alcohol, spicy foods, acidic items, high-sodium processed foods, excessive red/processed meats, and high-fat dairy; limiting these can reduce urgency, frequency, and nocturia in some individuals. For obese patients, achieving a 5% to 10% weight reduction through calorie control and exercise has been linked to improved urinary flow rates and decreased symptom bother. These recommendations are general; individual responses vary, and consultation with a healthcare provider is advised before major changes.[120][121][122] Bladder training techniques, such as timed voiding, encourage gradually increasing intervals between urinations—starting at every 1 to 2 hours and extending as tolerated—to build bladder capacity and reduce frequency.[123] This behavioral method, combined with urge suppression through distraction or pelvic muscle contraction, fosters better control over LUTS without invasive measures.[124] Patients should avoid over-the-counter decongestants and antihistamines, which can tighten the muscles around the urethra and worsen urinary symptoms by making it harder to urinate, and review all medications with a healthcare provider.[9][2] Stress reduction techniques, such as meditation and relaxation exercises, combined with regular physical activity, may help alleviate tension that can exacerbate urinary frequency. Quitting smoking and maintaining normal levels of blood pressure, cholesterol, and blood sugar are also recommended as part of overall health maintenance that may support prostate health. These lifestyle changes may ease symptoms and support overall prostate health. Patients should consult a healthcare provider before starting new regimens, making significant dietary changes, or implementing other modifications to ensure appropriateness for their individual condition.[2][9]

Pharmacological Therapies

Pharmacological therapies represent the cornerstone of medical management for lower urinary tract symptoms (LUTS) attributed to benign prostatic hyperplasia (BPH), offering symptom relief, improved quality of life, and reduced risk of progression without invasive procedures. These treatments target key pathophysiological elements, such as dynamic (smooth muscle tone) and static (epithelial and stromal hyperplasia) components of obstruction. Guidelines from the American Urological Association (AUA) and European Association of Urology (EAU) recommend initiating pharmacotherapy for moderate to severe bothersome LUTS after conservative measures, with selection based on prostate size, symptom profile, and patient comorbidities.[3][125] Alpha-1 adrenergic blockers, including selective agents like tamsulosin, alfuzosin, and silodosin, antagonize alpha-1 receptors in prostatic and urethral smooth muscle, leading to relaxation and improved urine flow. They provide rapid symptom improvement, typically within 1-2 weeks, with average reductions in International Prostate Symptom Score (IPSS) of 4-6 points and increases in maximum urinary flow rate (Qmax) of 2-3 mL/s. Efficacy is comparable across agents, though uroselective options like tamsulosin minimize cardiovascular effects. Common side effects include orthostatic hypotension (5-10% incidence), dizziness, and retrograde ejaculation (up to 20% with silodosin), with overall discontinuation rates around 10-15%. In patients with acute urinary retention (AUR), alpha-blockers (e.g., tamsulosin) are recommended to increase the success rate of trial without catheter (TWOC), typically administered for at least three days prior to attempting catheter removal. The AUA conditionally recommends alpha-blockers as first-line monotherapy for most patients with LUTS/BPH.[3][126][125] In patients with benign prostatic hyperplasia and renal insufficiency, tamsulosin is generally the preferred alpha-blocker among alfuzosin, tamsulosin, and doxazosin. Tamsulosin requires no dose adjustment for creatinine clearance (CrCl) ≥10 mL/min and is considered safe, with unbound drug levels unaffected by renal impairment. Alfuzosin should be used with caution or avoided in severe renal impairment (CrCl <30 mL/min) due to limited safety data. Doxazosin can be used without specific dose adjustment in renal impairment, but careful monitoring and gradual titration are recommended due to the risk of hypotension.[127][128][129] 5α-reductase inhibitors (5ARIs), such as finasteride and dutasteride, inhibit the conversion of testosterone to dihydrotestosterone (DHT), reducing prostate volume by 20-30% over 6-12 months and slowing disease progression. They are particularly effective for larger prostates (>30-40 g), with IPSS improvements of 3-5 points and Qmax increases of 1.5-2.5 mL/s, alongside a 50-60% reduction in the risk of acute urinary retention and need for surgery, as demonstrated in the MTOPS trial. In patients with larger prostates, 5ARIs are recommended for ongoing management to further reduce the risk of recurrent acute urinary retention. Dutasteride achieves greater DHT suppression (90-95% vs. 70% for finasteride), potentially offering superior long-term benefits. Side effects include sexual dysfunction (erectile dysfunction and decreased libido in 5-8%), gynecomastia, and a possible increased risk of high-grade prostate cancer, though overall prostate cancer detection is similar. The EAU strongly recommends 5ARIs for men with enlarged prostates and elevated prostate-specific antigen levels.[3][125][126] In cases of refractory gross hematuria attributed to BPH (after excluding other etiologies such as malignancy or infection via appropriate evaluation including cystoscopy), the American Urological Association (AUA) guidelines recommend 5-alpha reductase inhibitors (5-ARIs, e.g., finasteride or dutasteride) as an appropriate treatment option. These medications reduce prostate volume and vascularity over weeks to months, thereby decreasing the likelihood of recurrent bleeding episodes from fragile prostatic vessels. Phosphodiesterase-5 inhibitors (PDE5Is), notably tadalafil at a daily 5 mg dose, enhance nitric oxide-cyclic guanosine monophosphate signaling to relax prostatic and bladder smooth muscle, providing dual benefits for LUTS and erectile dysfunction. Clinical trials show IPSS reductions of 4-6 points and Qmax improvements of 1-2 mL/s after 12 weeks, with sustained effects over one year. Tadalafil is approved for BPH monotherapy or combination use, particularly in men with comorbid erectile dysfunction. Side effects are mild, including headache (3-5%), dyspepsia, and back pain, with low rates of hypotension when used alone. The AUA moderately recommends PDE5Is for men with both LUTS/BPH and erectile dysfunction.[3][126][130] Anticholinergics, such as solifenacin or oxybutynin, block muscarinic receptors to reduce bladder overactivity and storage symptoms like urgency and frequency, often added to alpha-blockers when irritative symptoms predominate. They yield additional IPSS storage subscore improvements of 2-3 points but may worsen post-void residual volume, requiring caution in men with elevated residuals (>150-200 mL). Side effects include dry mouth (20-30%), constipation, and blurred vision, limiting use in older patients. The EAU suggests anticholinergics as adjunctive therapy for predominant storage LUTS unresponsive to alpha-blockers.[125][126] Combination therapies enhance outcomes in select patients, particularly those with larger prostates. The combination of an alpha-blocker and 5ARI (e.g., doxazosin plus finasteride in the MTOPS trial or tamsulosin plus dutasteride in the CombAT trial) achieves 50% greater symptom reduction and 66% lower risk of progression compared to monotherapy, with prostate volume decreases of 25-30% and sustained IPSS benefits over 4-5 years. Alpha-blocker plus anticholinergic combinations improve storage symptoms by 4-5 IPSS points in men with mixed LUTS. The AUA strongly recommends alpha-blocker/5ARI combination for prostates >40 g to prevent progression.[3][125][126] Recent advancements include beta-3 adrenergic agonists like mirabegron, which activate beta-3 receptors in the bladder to promote detrusor relaxation and reduce overactive bladder symptoms in BPH patients. Added to alpha-blockers, mirabegron provides additional IPSS reductions of 2-4 points and improves patient-reported urgency without significantly increasing post-void residual. Side effects are minimal, primarily hypertension (1-2%) and urinary tract infections. The EAU conditionally recommends beta-3 agonists for men with persistent storage symptoms on alpha-blocker monotherapy.[125][131][130]

Surgical and Minimally Invasive Procedures

Surgical interventions for benign prostatic hyperplasia (BPH) are indicated in patients with severe symptoms refractory to medical therapy, acute urinary retention, recurrent urinary tract infections, recurrent bladder stones, or significant post-void residual urine volume exceeding 300 mL. For patients with acute urinary retention (AUR), initial management involves immediate urethral or suprapubic catheterization to relieve retention. Alpha-blockers (e.g., tamsulosin) are recommended to be administered for at least three days to increase the success rate of trial without catheter (TWOC). If TWOC fails or retention recurs, surgical intervention is indicated, with options such as transurethral resection of the prostate (TURP), holmium laser enucleation of the prostate (HoLEP), GreenLight laser photoselective vaporization, or minimally invasive options like Rezum or UroLift, depending on prostate size and patient factors. Long-term catheterization is considered only for patients unfit for surgery. These procedures aim to relieve bladder outlet obstruction by reducing prostate tissue volume, improving urinary flow, and alleviating lower urinary tract symptoms.[3][132][125] For moderate to severe symptoms unresponsive to medications, minimally invasive surgical therapies (MISTs) or procedures like transurethral resection of the prostate (TURP) are recommended, with guidelines emphasizing shared decision-making to balance efficacy, risks, and quality of life. Emerging non-intrusive options include prostatic urethral lift (UroLift), water vapor thermal therapy (Rezūm), prostatic artery embolization (PAE), temporary nitinol devices (iTIND), drug-coated balloons (Optilume), and recent prostatic stents (e.g., Zenflow, ProVee as of 2025), often preferred for preservation of sexual function and outpatient feasibility (see Surgery for benign prostatic hyperplasia for details). Transurethral resection of the prostate (TURP) remains the historical gold standard for surgical management of BPH in prostates typically 30-80 g in size, involving the removal of approximately 30-40 g of adenoma tissue via a resectoscope through the urethra.[133] It achieves symptom improvement in 80-90% of patients, with durable relief of obstruction and an average International Prostate Symptom Score (IPSS) reduction of about 70%.[133] Common risks include bleeding requiring transfusion in up to 2% of cases and urinary incontinence in 5-10% of patients, though long-term reoperation rates are low at around 5% over five years.[134][135] For very large prostates exceeding 80 g, where transurethral approaches may be less feasible, open simple prostatectomy via a retropubic approach is recommended, entailing an abdominal incision to enucleate the adenoma.[3] This procedure provides effective symptom relief similar to TURP but involves longer hospitalization (typically 3-5 days) and recovery periods of 4-6 weeks compared to endoscopic options.[136][137] Minimally invasive procedures offer office-based alternatives for patients with smaller prostates (<80 g) seeking to preserve sexual function and avoid general anesthesia. The prostatic urethral lift (UroLift) system deploys permanent implants to retract obstructing lateral lobes, resulting in an IPSS reduction of 10-15 points at one year with low retreatment rates (<5%).[138][139] Rezūm water vapor thermal therapy delivers steam injections to ablate prostate tissue, achieving comparable IPSS improvements of 10-15 points and preserving ejaculation in over 90% of cases.[140][141] The temporary implantable nitinol device (iTind) is placed for 5-7 days to reshape the urethra, yielding IPSS drops of 10-12 points with minimal complications and no impact on ejaculatory function.[141] Laser therapies, particularly holmium laser enucleation of the prostate (HoLEP), enable complete adenoma removal akin to open prostatectomy but endoscopically, suitable for all prostate sizes with reduced bleeding risk (transfusion rate <1%) compared to TURP.[132][142] HoLEP provides equivalent long-term efficacy to TURP, including Qmax improvements of 15-20 mL/s, but with shorter catheterization times and hospital stays.[143][144] The 2025 American Urological Association (AUA) guideline updates emphasize a preference for enucleation techniques like HoLEP in centers with surgical expertise, recognizing their size-independent applicability and favorable safety profile for patients on anticoagulation.[145][146]

Emerging and Alternative Treatments

Recent advancements in pharmacotherapy for benign prostatic hyperplasia (BPH) include gonadotropin-releasing hormone (GnRH) antagonists, such as degarelix, which directly inhibit prostate cell growth and reduce prostate volume. In a clinical study evaluating neoadjuvant androgen deprivation therapy, degarelix treatment resulted in a significant 36% reduction in prostate volume after 12 weeks, compared to baseline.[147] Although relugolix, another GnRH antagonist, is primarily approved for advanced prostate cancer and demonstrates rapid testosterone suppression leading to prostate-specific antigen declines, ongoing research is exploring its potential in BPH management, including for prevention of urinary retention. As of November 2025, analogs like teverelix are advancing in clinical development for BPH to offer rapid symptom relief and prostate volume reduction.[148][149][150] Artificial intelligence (AI) is increasingly applied in BPH to develop predictive models for disease progression and treatment outcomes, incorporating parameters like prostate-specific antigen (PSA) levels and urinary flow rates. Machine learning algorithms, such as those trained on the Medical Therapy of Prostatic Symptoms (MTOPS) dataset, have achieved acceptable discrimination (area under the curve approximately 0.80–0.85) in forecasting responses to medical therapies, enabling personalized algorithms that optimize patient selection for interventions.[151] These models enhance conceptual understanding of progression risk by integrating clinical and urodynamic data, reducing reliance on invasive diagnostics.[152] Regenerative medicine approaches, particularly stem cell injections, represent an investigational strategy for BPH by targeting tissue repair and reducing inflammation-associated hypertrophy. Early-phase clinical trials using autologous adipose-derived stem/stromal cells (AD-cSVF) are exploring potential symptom relief through anti-inflammatory effects, with studies evaluating long-term improvements in lower urinary tract symptoms.[153] Alternative medicine therapies for BPH, including naturopathic remedies such as saw palmetto (typically dosed at 160 mg twice daily), pygeum africanum, and beta-sitosterol; Ayurvedic formulations like Gokshura (Tribulus terrestris); and Traditional Chinese Medicine (TCM) practices such as herbal formulations and acupuncture, offer non-pharmacological options. Homeopathic medicines are sometimes proposed for BPH symptoms, but there is no reliable scientific evidence that any homeopathic medicines are effective for treating benign prostatic hyperplasia (BPH, prostate enlargement). The National Center for Complementary and Integrative Health (NCCIH) states that there is little evidence to support homeopathy as an effective treatment for any specific health condition and that it is not recommended as a substitute for conventional care.[154] There is limited high-quality scientific evidence that Ayurveda, TCM, or naturopathy reliably improve prostate-related urinary symptoms (e.g., from BPH or lower urinary tract symptoms). While some small clinical studies and traditional uses suggest potential symptom relief from specific herbs or practices, large, well-designed trials often show no significant benefit over placebo. A 2025 overview of dietary supplements indicated modest benefits in International Prostate Symptom Score (IPSS) reductions and urinary flow improvements for saw palmetto and beta-sitosterol, though results vary across studies.[155] Cochrane systematic reviews and other rigorous assessments confirm that beta-sitosterol improves urinary symptoms and flow measures in mild to moderate BPH, while pygeum shows similar modest IPSS benefits; however, saw palmetto provides little to no benefit over placebo in high-quality trials, including a 2023 Cochrane review and large placebo-controlled studies such as STEP (2006) and CAMUS (2011) referenced in American Urological Association guidelines.[156][157][158][159][160] Conventional medical treatments are generally recommended, and patients should consult a healthcare provider before using these therapies due to possible herb-drug interactions, lack of regulation, and variable product quality. Observational studies have explored mineral imbalances in BPH. A 2017 study found a high calcium-to-magnesium (Ca/Mg) ratio imbalance in 80% of BPH patients compared to controls, with levels normalizing after phytotherapeutic treatment.[73] Magnesium may support prostate health by promoting smooth muscle relaxation in the prostate and bladder, potentially improving urine flow and reducing lower urinary tract symptoms. Low magnesium has been linked to prostate issues in some research, though evidence is limited. Vitamin C (ascorbic acid), as an antioxidant, may help mitigate oxidative stress and inflammation contributing to BPH progression. Some studies suggest dietary vitamin C intake is associated with reduced BPH symptoms or risk,[161] but evidence for supplemental forms like magnesium ascorbate (providing both magnesium and vitamin C) is preliminary and mixed. Animal studies have shown vitamin C can prevent testosterone-induced prostate hyperplasia.[162] These nutritional factors are not established treatments and require further research; consult healthcare providers before supplementation. Sleep disturbances, frequently resulting from nocturia in patients with benign prostatic hyperplasia, may be managed with select insomnia medications. No direct head-to-head studies compare ramelteon, suvorexant, and low-dose doxepin for the treatment of insomnia in patients with benign prostatic hyperplasia. Low-dose doxepin is generally avoided in BPH due to its anticholinergic effects, which can increase the risk of urinary retention and worsen symptoms. Ramelteon has shown evidence of reducing nocturia (a key sleep disruptor in BPH) when combined with alpha-1 blockers. Suvorexant has no specific BPH data but no known urinary adverse effects.[163][164] Neuromodulation techniques, such as sacral nerve stimulation, provide targeted relief for refractory BPH cases, particularly persistent symptoms following surgical interventions. In an institutional series of 24 patients with post-BPH surgery urinary issues, 41.7% achieved sustained symptom improvement with a mean follow-up of 34 months, highlighting its role in managing detrusor overactivity and incomplete emptying.[165] Efforts to preserve bladder function in BPH focus on anti-fibrotic agents to mitigate detrusor muscle damage from chronic obstruction. Pirfenidone, an established anti-fibrotic, has been shown in a 2024 rat model of underactive bladder (potentially relevant to BPH complications) to suppress bladder fibrosis, increase bladder compliance, and improve voiding parameters by reducing fibrotic factor expression.[166] Recent reviews emphasize these agents' potential in halting progressive remodeling, aligning with 2025 paradigms for integrated BPH care.[167]

Epidemiology

Prevalence and Incidence

Benign prostatic hyperplasia (BPH) is a common condition among aging men, with histological evidence observed in approximately 50% of men by age 60, 80–90% in men over 70, and up to 90% by age 85 based on autopsy studies.[32][7] These studies indicate that histological prevalence rises exponentially after age 50, starting at around 20-30% in men aged 40-50, reflecting microscopic glandular and stromal proliferation even in the absence of symptoms.[168] In contrast, symptomatic BPH, characterized by lower urinary tract symptoms (LUTS), affects a smaller proportion, with only about 10% of men in their 40s-50s experiencing noticeable LUTS, while prevalence increases to roughly 50% by age 60.[1] In addition to existing histological prevalence (approximately 50% by age 60, 80–90% over 70, up to 90% by age 85), recent 2025 global analyses estimate the lifetime risk of developing BPH from age 40 onward at 27.29% (95% CI 27.26–27.31), with most cases occurring after age 50. Symptomatic prevalence is approximately 45% in men over 45 years, increasing to about 80% in men over 70. Regional variations persist, with higher lifetime risks in Eastern Europe (37.57%) and lower in sub-Saharan Africa (around 15%). These figures reflect updated Global Burden of Disease and other epidemiological studies accounting for aging populations and improved detection.[169][170] Globally, the prevalence of BPH reached 94 million cases among men aged 40 and older in 2019, up from 51 million in 1990, driven by population aging and longer life expectancy.[171] By 2021, the global number of prevalent cases had increased to 112.5 million (95% UI: 88.1–142.6 million).[172] The age-standardized prevalence rate was 2,480 per 100,000 population in 2019, with higher crude rates in older age groups.[171] In the United States, symptomatic BPH affects an estimated 14 million men, with National Health and Nutrition Examination Survey (NHANES) data showing self-reported prevalence of 11.8% among men over 40.[32][173] Incidence rates have also risen; globally, new cases totaled 11.3 million in 2019, while U.S. data from the Global Burden of Disease study indicate approximately 554,000 incident cases in 2019, with an age-standardized incidence rate of 196 per 100,000 population. Globally, the age-standardized rate was 280 per 100,000 in 2019.[174][175] Trends indicate a continued exponential increase post-50, with World Health Organization-linked Global Burden of Disease data showing annual new symptomatic cases rising alongside life expectancy, from 5.5 million incident cases in 1990 to over 11 million in 2019.[171] As of 2021, global prevalence reached 112.5 million cases among men aged 40 and older. Projections indicate further growth due to population aging, with the crude prevalence rate expected to reach 8,621 per 100,000 by 2035, while age-standardized rates remain stable, potentially affecting hundreds of millions more men due to aging populations in low- and middle-income countries.[172][170] Underreporting remains a significant issue, particularly in regions with cultural stigmas around urological health, leading to many cases going untreated in some areas due to reluctance to seek care for LUTS.[176] In the Middle East and North Africa, for instance, cultural perceptions contribute to lower diagnosis rates despite high underlying prevalence, exacerbating the global burden.[176]

Demographic Variations

Benign prostatic hyperplasia (BPH) exhibits notable racial and ethnic disparities in prevalence, prostate volume, and age at diagnosis. Black men in the United States demonstrate increased prostate transition zone and total prostate volumes compared to white men, contributing to a higher risk of BPH development.[33] The risk of BPH is approximately 41% higher among Black and Hispanic men relative to white men, with Black men often diagnosed at a younger age, averaging 63.1 years compared to 66.7 years for white men.[42][177] In contrast, Asian men experience a lower likelihood of BPH, potentially linked to dietary factors such as low-fat, high-fiber intake rich in phytoestrogens from soy products, which may exert protective effects against prostate enlargement.[178][179] Geographic patterns reveal substantial variations in BPH prevalence, with higher rates observed in Western and Eastern European populations compared to those in Africa and parts of Asia. Age-standardized prevalence in 2019 reached 6,480 per 100,000 in Eastern Europe, significantly exceeding the 987 per 100,000 in North Africa and the Middle East.[180] These differences may relate to urbanization and lifestyle shifts, as studies indicate higher BPH prevalence in urban settings versus rural areas in some regions, though findings are inconsistent across populations.[181] In low- and middle-income countries, including parts of Africa and Asia, reported prevalence ranges from 10% to 69% among men over 50, often lower than in high-income Western nations due to underdiagnosis but rising with increasing urbanization.[182] Socioeconomic factors profoundly influence BPH outcomes, particularly in low-income groups where access barriers lead to delayed diagnosis and more advanced presentations at the time of medical evaluation. Men from lower socioeconomic strata are less likely to receive a BPH diagnosis or surgical intervention, with studies showing Black and low-income individuals facing a 19% reduced likelihood of surgery compared to higher-income white counterparts.[183][184] This disparity contributes to elevated complication rates in underserved populations, as financial and healthcare access limitations exacerbate disease progression.[182] BPH is exclusive to biological males, with incidence rising sharply after age 50, but hormone therapy in transgender women (assigned male at birth) can modify prostate-related risks. Feminizing hormone therapy, involving estrogen and anti-androgens, appears to reduce the risk of BPH development by suppressing prostate growth, though the prostate remains in place and may still require monitoring for enlargement or other issues.[185] Recent global reviews from 2024–2025 highlight correlations between rising BPH incidence in developing nations and increasing obesity rates, with obesity elevating BPH risk by up to 28% via metabolic pathways, potentially amplified by climate-related lifestyle changes.[186][170] The Global Burden of Disease study projects continued increases in BPH prevalence through 2035, particularly in low-socioeconomic regions.[172]

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