What Is Polycystic Ovary Syndrome (PCOS)?

Irregular periods, stubborn acne, hair growing where you don't want it — if that combination sounds familiar, you may have wondered whether one condition could explain all of it. Often, it can. Polycystic ovary syndrome, usually shortened to PCOS, is a hormone pattern that affects how the ovaries work, and it's one of the most common reasons women of reproductive age visit a gynaecologist. The short animated video above (just over two minutes) introduces it plainly: PCOS is a common endocrine — hormone system — disorder, and women who have it may have enlarged ovaries dotted with small collections of fluid called follicles. Here's the walkthrough most patients actually want, question by question.

What is actually going on with the hormones?

In a typical cycle, the ovaries respond to a carefully timed sequence of hormone signals, ripen one follicle, and release an egg. In PCOS, that timing is disrupted. Levels of androgens — hormones everyone produces, but which run higher in PCOS — can interfere with egg development and release, so ovulation happens irregularly or sometimes not at all. Many follicles start to mature but stall partway, which is what gives the ovaries their "polycystic" appearance on an ultrasound scan: not true cysts that need removing, but a ring of small, unfinished follicles. Insulin often plays a supporting role too — many women with PCOS respond less well to insulin, and the extra insulin the body makes in response can push androgen levels higher still.

Which signs tend to show up first?

The pattern varies a lot from person to person, which is part of why PCOS is missed. Periods that come unpredictably, arrive months apart, or stop for stretches are the classic clue. Skin and hair often tell the story as well: acne that persists past the teenage years, thinning hair at the hairline, or new coarse hair on the face, chest or back. Weight gain that's hard to shift is common too. And because ovulation is irregular, PCOS is a frequent finding when someone is trying to conceive and it isn't happening. If several of these sound like you, it's worth raising them together with your clinician rather than treating each one as a separate nuisance — a related hormone-and-pain condition is covered in our guide to what endometriosis is, which shows how differently two common gynaecology conditions can behave.

How would a doctor confirm it?

There's no single test that stamps the diagnosis. Your clinician will usually piece it together from three things: your history of irregular or absent ovulation, signs or blood tests showing higher androgen activity, and sometimes an ultrasound looking at the ovaries. Typically, meeting two of those three is enough once other causes of the same symptoms — thyroid problems, for instance — have been ruled out with blood work. The site's "Polycystic Ovarian Disease" video (a little over three minutes) covers the same ground if you'd like a second explanation. A diagnosis conversation should also look ahead: because of the insulin connection, your clinician may check blood glucose and cholesterol and revisit them over time.

What does living with it involve?

PCOS is managed rather than cured, and the plan is built around your priorities. Regular physical activity and balanced eating are the foundation for almost everyone, because improving insulin sensitivity eases several parts of the pattern at once — even modest, sustainable changes help. Beyond that, treatment is targeted: cycle-regulating treatment if periods are the main issue, skin-directed options if acne or hair growth bother you most, and fertility support if and when you're trying to conceive. Which of those fits is a personal conversation with your own clinician, and it can change as your life stage does. The reassuring bottom line? Once it's named, PCOS is a well-understood, very workable condition — most of the work is steady, ordinary day-to-day management, not procedures.

MedicalVideos.com has published trusted medical videos since 2007. The site was founded by Dr. Mohamed Ibrahim, MD, PhD — physician-scientist.

Frequently Asked Questions

Does PCOS mean I have cysts that need surgery?
No. The "cysts" in the name are small, immature follicles visible on a scan — part of how the ovaries are working, not growths that need removing. Surgery is not a standard treatment for PCOS itself.

Can I still get pregnant if I have PCOS?
Many women with PCOS conceive, sometimes naturally and sometimes with help to prompt ovulation, because the main obstacle is irregular egg release rather than the eggs themselves. If you're trying, raise it early so timing and support can be planned.

Why does PCOS affect weight and blood sugar?
Many women with PCOS respond less well to insulin, so the body produces more of it — and higher insulin can drive both weight gain and higher androgen levels. That's why activity, eating patterns and periodic glucose checks are part of routine care.

Is PCOS something that goes away after menopause?
The reproductive features settle once periods stop, but the metabolic side — insulin resistance and cardiovascular risk factors — can persist, so the health checks your clinician recommends are worth continuing.

Do I need an ultrasound to be diagnosed?
Not always. Diagnosis usually rests on a combination of irregular ovulation, androgen signs or blood tests, and scan findings — typically two of the three, after other causes are excluded. Your clinician decides which pieces are needed in your case.

Educational only — this article is general information about polycystic ovary syndrome, not medical advice and not a diagnosis. If you have irregular periods, persistent acne, unusual hair growth or difficulty conceiving, discuss them with your own clinician, who can arrange the right tests for you.