One cause of male pattern baldness is genetics, or having a family history of baldness. Research has found that male pattern baldness is associated with male sex hormones called androgens. The androgens have many functions, including regulating hair growth. Each hair on your head has a growth cycle.
The cause of hypertrichosis is unknown. Congenitalhypertrichosis is believed to be a genetic disorder that is inherited or occurs as a result of spontaneous mutation. Acquired hypertrichosis lanuginosa sometimes occurs in people who at a later stage are diagnosed with a cancer of some form.