PCOS looks different on everyone
Two women with PCOS can have almost completely different symptoms. That's one reason it goes undiagnosed for years. Here's the full picture of what PCOS can cause and why.
Cycle symptoms
- Irregular periods — cycles longer than 35 days, or fewer than 8 periods a year.
- Missing periods — months with no bleeding at all.
- Heavy or unpredictable bleeding — when ovulation doesn't happen regularly, the uterine lining can build up and shed heavily.
Skin and hair symptoms
- Acne — often along the jawline, chin, and back; can persist well past the teen years.
- Excess hair growth — on the face, chest, or back (doctors call this hirsutism).
- Scalp hair thinning — widening part or shedding, driven by androgen excess.
- Dark skin patches — velvety darkened areas on the neck, armpits, or groin, linked to insulin resistance.
Weight and metabolic symptoms
- Weight gain — especially around the abdomen, and weight that's unusually hard to lose.
- Insulin resistance — the body's cells respond poorly to insulin; it underlies many PCOS symptoms and raises long-term diabetes risk.
- Fatigue — persistent tiredness even with enough sleep.
Fertility symptoms
PCOS is a leading cause of ovulatory infertility — when ovulation doesn't happen regularly, pregnancy can't happen regularly either. The good news: restoring ovulation is often very achievable with treatment.
Mood symptoms
Women with PCOS report higher rates of anxiety and depression. Hormones, sleep disruption, and the stress of unexplained symptoms all play a role. These deserve care too — not dismissal.
When to get evaluated
If you have two or more of these symptoms — especially irregular periods plus any skin, hair, or weight changes — it's worth an evaluation. You don't need to wait until you're trying to conceive.
Frequently Asked Questions
Can you have PCOS with regular periods?
It's less common, but possible. Some women ovulate irregularly while still bleeding monthly. A provider looks at the whole picture — symptoms, labs, and history — not just cycle length.
Does PCOS always cause weight gain?
No. Many women with PCOS are at a typical weight ('lean PCOS'). The hormone imbalance is the core issue, not weight itself.