PMOS

PMOS 101: Symptoms, Causes & What to Do Next

May 20266 min read

Reviewed by Zuvi’s OB/GYN medical panel

What PMOS actually is

PMOS is a hormonal disorder characterised by elevated androgens (male hormones), irregular ovulation, and — in many but not all cases — small follicle cysts on the ovaries. The name is a bit misleading: you don't need cysts to have PMOS, and having ovarian cysts doesn't mean you have PMOS. Diagnosis is based on at least two of three criteria: irregular cycles, elevated androgens (on a blood test or visible as acne/excess hair), and polycystic ovaries on ultrasound.

Polycystic ovaries on a scan aren't the whole story

It is worth clearing up a mix-up that causes a lot of unnecessary worry. When an ultrasound shows many small follicles on the ovaries, the report may call them "polycystic ovaries" — the medical term is polycystic ovarian morphology, or PCOM. On its own, this appearance is very common and usually harmless: plenty of women have polycystic-looking ovaries alongside regular cycles and no symptoms at all, and need no treatment. PMOS is the broader syndrome, and it is only diagnosed when that scan finding comes together with other signs like irregular ovulation or higher androgens. In other words, a scan alone cannot diagnose PMOS — how your cycles behave and how you feel matter just as much. If you have been told you have polycystic ovaries but feel well and your periods are regular, there is a good chance it is PCOM rather than the syndrome.

Read: PCOS vs PMOS — what's the difference?

Common symptoms

Irregular or absent periods are the most common sign, but PMOS shows up differently in different people. Other symptoms include acne (particularly along the jawline), excess facial or body hair (hirsutism), thinning scalp hair, difficulty losing weight, and skin tags or dark patches around the neck and armpits. Not everyone will experience all of these — some people have very mild presentations and discover PMOS only when trying to conceive.

What causes it

PMOS has a strong genetic component — if your mother or sister has it, your risk is higher. Insulin resistance is central to most cases: when cells don't respond well to insulin, the pancreas produces more of it, and excess insulin signals the ovaries to produce more androgens. This hormonal cascade disrupts normal ovulation. Lifestyle factors like chronic stress, poor sleep, and a high-glycaemic diet can worsen insulin resistance and amplify symptoms.

What to do next

If you suspect PMOS, the first step is a blood panel (day 2–5 of your cycle) to check LH, FSH, testosterone, prolactin, and fasting insulin, along with a pelvic ultrasound. There is no cure, but PMOS is very manageable. Lifestyle changes — particularly reducing refined carbohydrates and improving sleep — can restore regular cycles in many people. Your gynaecologist may also recommend hormonal therapy, metformin, or other medications depending on your goals (cycle regulation vs. fertility vs. symptom management).

References & sources

This article reflects clinical guidance from the following recognised medical bodies.

Educational information only — not a substitute for personal medical advice. Always consult your own doctor.

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