SLOT: Full Definition
What is hirsutism?
Hirsutism — also called excess facial hair or male-pattern hair growth — is the appearance of thick, dark, coarse hair in areas where women typically grow only fine vellus hair: the upper lip, chin, jawline, chest, lower abdomen, lower back, and inner thighs. It is different from the normal vellus or fine terminal hair most women have on these areas. The hallmark is coarse, pigmented, terminal hair in a male-pattern distribution.
Hirsutism affects roughly 5-10% of women of reproductive age and is one of the most visible signs of androgen excess. It is a symptom that almost always has a treatable hormonal driver.
What conditions cause hirsutism?
The overwhelming majority of hirsutism cases trace back to androgen excess:
- Polycystic Ovary Syndrome — by far the most common cause, responsible for roughly 75-80% of hirsutism
- Idiopathic hirsutism — increased skin sensitivity to normal androgen levels
- Late-onset congenital adrenal hyperplasia — genetic enzyme variant that elevates androgens
- Cushing's syndrome — excess cortisol with associated androgen elevation
- Androgen-secreting tumors of the ovary or adrenal — rare but important to rule out when symptoms are severe or rapid-onset
- Insulin resistance — drives ovarian androgen production
- Certain medications — including some progestins
Mild increases in upper lip or chin hair are also common in Perimenopause and Menopause, when estrogen falls relative to androgens.
When is hirsutism a red flag?
Most hirsutism develops gradually and reflects PCOS or genetic predisposition. Red flags requiring urgent workup include rapid onset of hair growth over weeks to a few months, deepening voice, clitoral enlargement, severe acne developing alongside, scalp hair thinning in a male pattern, and rapid weight gain. These can suggest a tumor or significant adrenal pathology and warrant prompt evaluation with a fuller hormone workup.
What typically helps
At Modern Thyroid Clinic, hirsutism prompts a thorough hormonal evaluation: total and free Testosterone Total Free, Dhea S, sex hormone binding globulin, 17-hydroxyprogesterone, prolactin, fasting insulin and glucose, A1c, and a full thyroid panel. Imaging is added when labs suggest it.
Treatment is tailored to the cause. For PCOS, foundational work focuses on insulin resistance — nutrition, strength training, and sometimes berberine or metformin. Spironolactone blocks androgens at the hair follicle and is highly effective, though hair growth slows over 6-12 months. Cosmetic treatments (laser, electrolysis) provide faster visible relief and complement medical therapy. With consistent treatment, most women see meaningful reduction in unwanted hair growth.
Common symptoms
Common questions
Is hirsutism always PCOS?
PCOS accounts for roughly three-quarters of hirsutism cases, but not all. Other causes include idiopathic hirsutism (normal androgens but very sensitive skin receptors), late-onset congenital adrenal hyperplasia, Cushing's syndrome, and rare androgen-secreting tumors. Family pattern, ethnicity, and the rate of hair growth all matter in sorting out the cause. A proper workup with full androgen labs and ovarian ultrasound clarifies the picture so treatment is matched to the underlying driver, not assumed.
Will treatment make the hair fall out?
Treatment slows new hair growth and softens existing hairs, but it rarely makes coarse terminal hairs disappear on their own. That is why combined treatment is so effective — medical therapy (such as addressing insulin resistance or using spironolactone) prevents new growth and reduces darkness, while laser hair removal or electrolysis removes existing coarse hairs. Most women notice slower growth and finer texture within 6-9 months of medical therapy, with cosmetic treatments accelerating visible change.
What labs do you run for hirsutism?
A standard hirsutism panel at Modern Thyroid Clinic includes total and free testosterone, DHEA-S, sex hormone binding globulin, 17-hydroxyprogesterone (drawn in the morning to screen for late-onset CAH), prolactin, fasting insulin and glucose, A1c, and a full thyroid panel. We add LH, FSH, and pelvic ultrasound when PCOS is suspected. Markedly elevated androgens or rapid symptom onset prompt adrenal imaging to rule out a tumor.
Think you might be dealing with this?
Talk to a Modern Thyroid Clinic specialist about your symptoms, labs, and next steps.
Book a Discovery CallThis content is for educational purposes only and is not medical advice. Consult a licensed clinician for diagnosis and treatment. Content on this page does not create a doctor-patient relationship with Modern Thyroid Clinic.