Gynecologic Conditions

PCOS Symptoms and Diagnosis: What to Know About Polycystic Ovary Syndrome

By the Find Her Doctor editorial team · Updated November 1, 2026 · 5 min read

PCOS (polycystic ovary syndrome) is a common hormone condition that causes irregular or missed periods, signs of high androgens like extra facial or body hair and acne, and sometimes many small follicles on the ovaries. You're diagnosed when you have at least two of those three features and other causes have been ruled out. PCOS is also tied to insulin resistance and long-term health risks, so a diagnosis matters even if you're not trying to get pregnant.

It's one of the most common hormone disorders in people of reproductive age, and many people go years without a diagnosis. A familiar pattern: irregular periods in high school, put on the pill "to regulate things," and nobody connects the dots until years later, when they stop the pill and their cycle doesn't come back.

The symptoms, grouped the way clinicians think about them

Symptoms often start around the first period, though some people notice them later, often after weight gain.

Your cycle

• Irregular periods, such as cycles longer than about 35 days or fewer than eight periods a year
• Missed periods for months at a time
• Very heavy bleeding when a period finally comes

Signs of high androgens

• Hirsutism: coarse, dark hair on the face, chin, chest, belly or back. Many people quietly pluck or wax chin hairs for years and never mention it to a doctor. Mention it. It's a diagnostic clue, not a cosmetic footnote.
• Acne, especially stubborn or adult acne
• Thinning hair on the scalp

Metabolic and other signs

• Weight gain or trouble losing weight, especially around the waist
• Darkened, velvety skin in body folds like the neck or armpits (acanthosis nigricans), a sign of insulin resistance
• Skin tags
• Trouble getting pregnant because ovulation is irregular
• Mood changes, including higher rates of anxiety and depression

Not everyone has every symptom, and PCOS happens in people of all body sizes. "You're not overweight, so it can't be PCOS" is a myth.

What causes it?

The exact cause isn't known. PCOS runs in families, and two factors seem central:

• Higher-than-normal androgen levels, which interfere with ovulation
• Insulin resistance, where the body doesn't respond well to insulin. Higher insulin levels can push the ovaries to make more androgens.

How diagnosis works

There's no single test. Most clinicians use the Rotterdam criteria, supported by ACOG and the 2023 international PCOS guideline. For adults, PCOS is diagnosed with at least two of these three:

1. Irregular or absent ovulation, usually shown by irregular periods
2. High androgens, either as symptoms (like hirsutism) or on a blood test
3. Polycystic ovaries on ultrasound, or, under the 2023 guideline, a high anti-Müllerian hormone (AMH) level in adults

Other conditions with similar symptoms have to be ruled out first. Expect a blood draw and possibly an ultrasound.

One thing to know: hormonal birth control can affect some of these results. Bring a list of your medicines, and ask whether you need to do anything differently before testing.

For teens and parents

Diagnosis works differently in adolescents. Irregular cycles are normal for the first few years after the first period, and many teens have ovaries that look "polycystic" on ultrasound. So the international guideline says teens need both irregular cycles and high androgens to be diagnosed, and it doesn't recommend ultrasound for diagnosis within eight years of the first period. A teen with some signs may be called "at risk" and re-checked later. That's not a brush-off; it's careful practice.

Why it matters beyond periods

PCOS is linked to a higher risk of:

• Type 2 diabetes and prediabetes
• High cholesterol and high blood pressure
• Sleep apnea
• Endometrial hyperplasia and endometrial cancer, because without regular ovulation, the uterine lining can build up without shedding
• Fatty liver disease
• Depression, anxiety and eating disorders
• Pregnancy complications, such as gestational diabetes

Regular screening and treatment can lower these risks.

Treatment is matched to your goals

The question your clinician will ask is, "What bothers you most right now?" Treatment for someone who wants regular periods and clearer skin looks different from treatment for someone trying to conceive.

• Lifestyle changes. Regular activity and a healthy eating pattern can improve insulin resistance and cycle regularity. For people at a higher weight, modest weight loss can help symptoms.
• Hormonal birth control. Combined pills, the patch or the ring can regulate periods, lower androgens, improve acne and hirsutism, and protect the uterine lining.
• Progestin therapy. Taken cyclically or as a hormonal IUD, it protects the uterine lining if you're not on combined birth control.
• Metformin. A diabetes medicine sometimes used to improve insulin resistance and metabolic health.
• Anti-androgen medicines, such as spironolactone, for excess hair or acne. These are usually paired with reliable birth control because they aren't safe in pregnancy.
• Hair removal and skin care for hirsutism and acne. Medicine for hair growth takes months to show results, so many people combine it with laser or other removal methods.

If you're trying to get pregnant, ovulation induction and other fertility treatments are options, and a reproductive endocrinologist can guide you.

Is it PCOS or something else?

Irregular periods have many causes, including thyroid disease, high prolactin, stress, intense exercise and weight changes. See our guide to missed periods when you're not pregnant. The "cysts" in PCOS are also different from the single larger cysts in our ovarian cysts guide.

Your prep checklist

• Track your periods for several months: start dates and how long each lasts. A phone app is fine.
• List your symptoms, such as hair growth, acne, hair thinning or skin changes, and when they started.
• Note family history of PCOS, diabetes, high cholesterol or heart disease.
• Bring your medicine list, including birth control.

Questions to ask:

• Which of the criteria do I meet?
• What screening do I need for diabetes and cholesterol, and how often?
• Which treatment fits my goals right now, and what if my goals change?

When to see a doctor

Book with a gynecologist or primary care clinician if you:

• Have fewer than eight periods a year, or go three months or more without one
• Notice new or worsening facial or body hair, acne or scalp hair loss
• Have darkened skin patches in body folds
• Have trouble getting pregnant
• Have very heavy bleeding when your period does come

Your next step

PCOS is often diagnosed and managed by gynecologists, primary care clinicians and endocrinologists, with reproductive endocrinologists brought in when fertility is the goal. Browse gynecologists, check gynecology in Westchester County, or use the provider search to find care in the five boroughs, Long Island or the Hudson Valley.

Frequently asked questions

Sources

• ACOG — Polycystic Ovary Syndrome (PCOS) (Patient FAQ)
• ACOG — Polycystic Ovary Syndrome (Practice Bulletin 194)
• International Evidence-based Guideline for the Assessment and Management of Polycystic Ovary Syndrome (2023)
• NIH, NICHD — Polycystic Ovary Syndrome (PCOS)
• MedlinePlus — Polycystic Ovary Syndrome

This article is for general education and is not medical advice. It does not replace an evaluation by a licensed clinician who knows your history. If you think you have a medical emergency, call 911.