Women normally produce low levels of male hormones (androgens). If your body makes too much of this hormone, you may have unwanted hair growth.

In most cases, the exact cause is never known. The condition often runs in families.

A common cause of hirsutism is polycystic ovarian syndrome (PCOS). Women with PCOS and other hormone conditions that cause unwanted hair growth may also have:

• Acne
• Problems with menstrual periods
• Trouble losing weight
• Diabetes

If these symptoms start suddenly, you may have a tumor that releases male hormones.

Other, less common causes of unwanted hair growth may include:

• Thyroid disorders
• Tumor or cancer of the adrenal gland
• Tumor or cancer of the ovary
• Cushing syndrome
• Congenital adrenal hyperplasia
• Hyperthecosis -- a condition in which the ovaries produce too much male hormones

Use of certain medicines may also be the cause of unwanted hair growth, including:

• Testosterone
• Danazol
• Anabolic steroids
• DHEA
• Glucocorticoids
• Cyclosporine
• Minoxidil
• Phenytoin

Female body builders may take male hormones (anabolic steroids), which may result in excessive hair growth.

In rare cases, women with hirsutism have normal levels of male hormones, and the specific cause of the unwanted hair growth cannot be identified.

The main symptom of this condition is the presence of coarse dark hair in areas that are sensitive to male hormones. These areas include:

• Chin and upper lip
• Chest and upper abdomen
• Back and buttocks
• Inner thigh

Your health care provider will examine you and ask about your symptoms.

Tests that may be done may include any of the following:

• Thyroid stimulating hormone (TSH)
• Prolactin
• Testosterone test
• DHEA-sulfate test
• Pelvic ultrasound (if virilization, or development of male characteristics, is present)
• CT scan or MRI (if virilization is present)
• 17-hydroxyprogesterone blood test
• ACTH stimulation test

Hirsutism is generally a long-term problem. There are many ways to remove or treat unwanted hair. Some treatment effects last longer than others.

• Medicines -- Drugs such as birth control pills, anti-androgen medicines, and spironolactone are a few options for some women.
• Electrolysis -- Electrical current is used to permanently damage individual hair follicles so they do not grow back. This method is expensive, and multiple treatments are needed. Swelling, scarring, and redness of the skin may occur.
• Laser energy directed at the dark color (melanin) in the hairs -- This method is best for a large area of very dark hair. It does not work on blond or red hair.

Temporary options include:

• Shaving -- Although this does not cause more hair to grow, it may make hair look thicker.
• Chemicals, plucking, and waxing -- These options are safe and inexpensive. However, chemical products may irritate the skin.

For women who are overweight, weight loss may be able to help reduce hair growth.

Hair follicles grow for about 6 months before falling out. Therefore, it takes many months of taking medicine before you will notice a decrease in hair growth.

Many women get good results with temporary steps to remove hair or lighten it.

Most of the time, hirsutism does not cause health problems. But many women find it bothersome or embarrassing.

Contact your provider if you have any of the following:

• The hair grows rapidly.
• You also have male features such as acne, deepening voice, increased muscle mass, male pattern thinning of your hair, increasing size of the clitoris, and decreased breast size.
• You are concerned that medicine you are taking may be increasing the growth of unwanted hair.

Hypertrichosis; Hirsutism; Hair - excessive (women); Excessive hair in women; Hair - women - excessive or unwanted

Bulun SE. Physiology and pathology of the female reproductive axis. In: Melmed S, Auchus RJ, Goldfine AB, Koenig RJ, Rosen CJ, eds. Williams Textbook of Endocrinology. 14th ed. Philadelphia, PA: Elsevier; 2020:chap 17.

Dinulos JGH. Hair diseases. In: Dinulos JGH, ed. Habif's Clinical Dermatology: A Color Guide in Diagnosis and Therapy. 7th ed. Philadelphia, PA: Elsevier; 2021:chap 24.

Tosti A. Diseases of hair and nails. In: Goldman L, Cooney KA, eds. Goldman-Cecil Medicine. 27th ed. Philadelphia, PA: Elsevier; 2024:chap 409.

Updated by: Linda J. Vorvick, MD, Clinical Professor, Department of Family Medicine, UW Medicine, School of Medicine, University of Washington, Seattle, WA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.