Hyperhidrosis

Hyperhidrosis is a medical condition in which a person exhibits excessive sweating, more than is required for the regulation of body temperature. Although it is primarily a physical burden, hyperhidrosis can deteriorate the quality of life of the people who are affected, frequently leading to psychological, physical, and social consequences. Hyperhidrosis can lead to difficulties in professional fields, with more than 80% of patients experiencing moderate to severe emotional effects from the disease.

This excess of sweat happens even if the person is not engaging in tasks that require muscular effort, and it does not depend on the exposure to heat. Common places to sweat can include underarms, face, neck, back, groin, feet, and hands. It has been called by some researchers 'the silent handicap'.

Both diaphoresis and hidrosis can mean either perspiration (in which sense they are synonymous with sweating) or excessive perspiration, in which case they refer to a specific, narrowly defined, clinical disorder.

Hyperhidrosis can either be generalized, or localized to specific parts of the body. Hands, feet, armpits, groin, and the facial area are among the most active regions of perspiration due to the high number of sweat glands (eccrine glands in particular) in these areas. When excessive sweating is localized (e.g. palms, soles, face, underarms, scalp) it is referred to as primary hyperhidrosis or focal hyperhidrosis. Excessive sweating involving the whole body is termed generalized hyperhidrosis or secondary hyperhidrosis. It is usually the result of some other, underlying condition.^{[citation needed]}

Primary or focal hyperhidrosis may be further divided by the area affected, for instance, palmoplantar hyperhidrosis (symptomatic sweating of only the hands or feet) or gustatory hyperhidrosis (sweating of the face or chest a few moments after eating certain foods).

Hyperhidrosis can also be classified by onset, either congenital (present at birth) or acquired (beginning later in life). Primary or focal hyperhidrosis usually starts during adolescence or even earlier and seems to be inherited as an autosomal dominant genetic trait. It must be distinguished from secondary hyperhidrosis, which can start at any point in life, but usually presents itself after 25 years of age. Secondary hyperhidrosis commonly accompanies conditions such as diabetes mellitus, Parkinson's disease, hyperthyroidism, hyperpituitarism, anxiety disorder, pheochromocytoma, and menopause.

One classification scheme uses the amount of skin affected. In this scheme, excessive sweating in an area of 100 cm² (16 in²) or more is differentiated from sweating that affects only a small area.

Another classification scheme is based on possible causes of hyperhidrosis.^{[citation needed]}