Causes

Hirsutism may be caused by:

• Polycystic ovary syndrome (PCOS). This condition, which often begins with puberty, causes an imbalance of sex hormones. Over years, PCOS may slowly result in excess hair growth, irregular periods, obesity, infertility and sometimes multiple cysts on the ovaries.
• Cushing syndrome. This occurs when your body is exposed to high levels of the hormone cortisol. It can develop from your adrenal glands making too much cortisol or from taking medications such as prednisone over a long period.
• Congenital adrenal hyperplasia. This inherited condition is characterized by abnormal production of steroid hormones, including cortisol and androgen, by your adrenal glands.
• Tumors. Rarely, an androgen-secreting tumor in the ovaries or adrenal glands can cause hirsutism.
• Medications. Some medications can cause hirsutism. These include minoxidil (Minoxidil, Rogaine); danazol, which is used to treat women with endometriosis; testosterone (Androgel, Testim); and dehydroepiandrosterone (DHEA). If your partner uses topical products containing androgens, you can be affected as well, through skin-to-skin contact.

Often hirsutism occurs with no identifiable cause.