X-linked hypertrichosis, also known as X-linked congenital generalized hypertrichosis, is a hereditary disorders characterized by generalized congenital hypertrichosis and thick eyebrows.

Hypertrichosis is characterized as excessive hair growth anywhere on the body, in either men or women. X-linked hypertrichosis affects males more than females.

X-linked hypertrichosis was first mapped in chromosome Xq24-q27.1 in a Mexican family; however, the underlying genetic facts remain unknown. X-linked hypertrichosis is inherited in an X-linked dominant pattern of inheritance.