In short: in PCOS (also called PCOD), higher levels of male-type hormones (androgens) can shrink hair follicles on the top of the head, causing thinning at the parting and crown. It is treatable. Doctors usually treat the hormones (often with a contraceptive pill and/or spironolactone) and the follicles (with minoxidil). Expect 6–12 months before regrowth is clearly visible.
How PCOS causes hair loss
- PCOS is a hormonal condition. Many women with it have higher androgens (such as testosterone) or follicles that are more sensitive to them.
- In follicles on the scalp, androgens (via DHT) cause gradual shrinking: thick hairs are replaced by thinner, shorter ones. This is the same process as female pattern hair loss.
- Insulin resistance, common in PCOS, can raise androgen levels further.
Hair thinning can happen even if your testosterone blood test is normal, because follicle sensitivity matters too.
What PCOS hair loss looks like
- A wider parting and scalp showing on top
- A thinner ponytail
- The front hairline usually stays; some women have thinning at the temples
- Often alongside irregular periods, acne, facial or body hair, or weight gain → Not sure it's PCOS? Take the cause finder
Getting diagnosed
PCOS is usually diagnosed when at least two of these are present, after other causes have been ruled out:
- Irregular or absent periods
- Signs of high androgens (acne, excess hair, scalp hair thinning) or high androgens on a blood test
- Polycystic ovaries on ultrasound
Tests often include: testosterone (total ± free), DHEA-S, TSH, prolactin, blood sugar or HbA1c, lipids, plus ferritin and vitamin D, because other causes of hair loss often coexist.
Who to see: a gynaecologist or endocrinologist for PCOS, plus a dermatologist for the hair. Many women need both.
Treatments that help
| Treatment | What it does | Evidence for hair | Notes |
|---|---|---|---|
| Minoxidil (2%, or 5% foam; or low-dose oral) | Stimulates follicles | Strong for female pattern thinning | First-line for the hair itself |
| Combined oral contraceptive pill (some types have anti-androgen effects) | Lowers androgens; regulates periods | Moderate | Prescribed by your gynaecologist; not for everyone |
| Spironolactone | Blocks androgens | Moderate | Must not be taken during pregnancy; reliable contraception needed |
| Weight loss, if overweight (5–10% of body weight) | Can lower androgens and insulin | Indirect | Helps PCOS overall |
| Metformin | Improves insulin resistance | Indirect, limited for hair | For metabolic PCOS; prescribed by your doctor |
| Finasteride / other anti-androgens | Block DHT | Limited in women | Specialist use only, with strict contraception |
| Correcting low iron or vitamin D | Removes extra causes | Helps if deficient | Test first |
Often the most effective approach is a combination: hormone treatment plus minoxidil, with deficiencies corrected.
Supplements and home remedies
- Inositol is studied for PCOS periods and metabolism. Evidence for hair specifically is limited.
- Biotin helps only if you're deficient, which is rare. → Biotin
- Spearmint tea, saw palmetto, rosemary oil: small or early studies only. Don't rely on them instead of proven treatment.
- Oiling and hair masks can improve how hair looks and feels. They don't treat the hormonal cause.
How long until regrowth?
| Time | What to expect |
|---|---|
| 0–3 months | Shedding may continue or briefly increase (especially with minoxidil) |
| 3–6 months | Shedding slows |
| 6–12 months | Visible improvement in density for many women |
| Ongoing | Treatment usually needs to continue to keep results |
Take monthly photos of your parting in the same light. → How to track progress
Planning a pregnancy?
Stop spironolactone and other anti-androgens before trying to conceive, as your doctor advises. Topical minoxidil is also usually stopped during pregnancy and breastfeeding. Discuss this early with your doctors.
See a doctor soon if you have: round bald patches that appear suddenly · hair coming out in clumps · redness, pain, pus, scaling or scarring on the scalp · hair loss with fever, weight loss, irregular periods, acne or new facial hair · eyebrow or eyelash loss · hair loss in a child.
Sources
- Teede HJ, et al. Recommendations from the 2023 International Evidence-based Guideline for the Assessment and Management of Polycystic Ovary Syndrome.
- Lucky AW, et al. J Am Acad Dermatol. 2004;50:541–53.
Medical review pending: not yet reviewed by a dermatologist. Medical disclaimer
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