What Is PCOS? Symptoms, Causes, and What to Do About It

If you just found out you have PCOS, or you are reading a symptom list and quietly recognizing yourself in it, you are in the right place. PCOS can feel confusing and frustrating, especially when it comes with that unhelpful line: “there is no cure.”

Here is the honest, hopeful truth: you can do a lot about PCOS. It has no single magic fix, but it responds remarkably well when you understand what is happening in your body and take the right steps. This guide walks you through exactly what PCOS is, how it is diagnosed, and what actually helps.

What PCOS actually is

PCOS stands for polycystic ovary syndrome, and at its core it is a hormonal imbalance. In women with PCOS, the ovaries (and sometimes signals from the brain) produce higher than normal levels of male hormones called androgens. This is very often paired with insulin resistance, where the body has to make more insulin to keep blood sugar in check.

That combination throws off ovulation, the monthly release of an egg, which is the root of most PCOS symptoms. When ovulation is irregular, periods become unpredictable, hormones stay out of balance, and the visible signs (acne, unwanted hair, weight changes) follow.

The name is also a bit of a trap. The “cysts” you might see on an ultrasound are not true cysts. They are lots of small follicles that never fully matured. You can absolutely have PCOS without them, which is why doctors no longer rely on ultrasound alone.

The symptoms to recognize

PCOS looks different from one woman to the next, which is part of why it is so often missed. The most common signs include:

• Irregular, infrequent, or missing periods, the single most common symptom. Learn more in our guide to PCOS and irregular periods.
• Persistent acne or oily skin, especially along the jaw and chin. See PCOS acne.
• Excess hair growth (hirsutism) on the face, chest, or stomach. See PCOS and unwanted hair.
• Thinning hair or hair loss on the scalp. See PCOS hair loss.
• Trouble losing weight or weight gain around the middle. See how to lose weight with PCOS.
• Difficulty getting pregnant, because ovulation is disrupted. See PCOS and pregnancy.
• Fatigue, cravings, and mood changes, often tied to insulin resistance.

You do not need to have every symptom to have PCOS. Two women with the same diagnosis can look completely different, which is why PCOS is often described in types.

What causes PCOS?

There is no single cause, but researchers point to a few interacting drivers:

1. Insulin resistance. Present in most women with PCOS, high insulin pushes the ovaries to make more androgens. This is the central lever, and it is why nutrition and movement matter so much. Read more in insulin resistance and PCOS.
2. Higher androgens. Excess male hormones cause acne, unwanted hair, and disrupted ovulation.
3. Genetics. PCOS often runs in families, so if your mother or sister has it, your risk is higher.
4. Low-grade inflammation, which appears to play a supporting role.

Importantly, PCOS is not your fault and it is not caused by anything you did. It is a medical condition, and it deserves real care.

How PCOS is diagnosed

Doctors diagnose PCOS using the Rotterdam criteria. You are considered to have PCOS when at least 2 of these 3 are present, after ruling out other conditions:

1. Irregular or absent ovulation (long, unpredictable, or missing cycles).
2. Signs of high androgens, either physical (acne, excess hair) or on a blood test.
3. Polycystic ovaries on ultrasound, or a high level of AMH (anti-Müllerian hormone).

In practice, this means a conversation with your doctor, a blood test to check hormones, and sometimes an ultrasound. If you feel dismissed, it is completely reasonable to ask for a referral to a gynecologist or endocrinologist. You know your body.

What to do about PCOS: the 4 levers

The 2023 international guidelines are clear that the first-line treatment for PCOS is not a pill, it is lifestyle. Here is where to start.

1. Understand and track your body

You cannot manage what you cannot see. Tracking your cycles, symptoms, energy, and habits reveals patterns that are invisible day to day, and it transforms doctor visits: you arrive with data instead of guesses.

2. Nutrition and movement

This is the most powerful lever against insulin resistance, and it does not require an extreme diet:

• Favor lower glycemic foods (vegetables, legumes, whole grains) that keep blood sugar steady.
• Add protein and healthy fats to every meal to blunt glucose spikes.
• Move regularly. A mix of cardio and strength training improves insulin sensitivity.

Even modest changes can bring periods back and ease symptoms. The goal is hormonal balance, not thinness. Start with our PCOS diet guide and weight loss guide.

3. Medical treatment

Depending on your goals, your doctor may suggest:

• Combined birth control pills, often first-line for regulating cycles and reducing acne and unwanted hair.
• Metformin, when insulin resistance is significant. See metformin for PCOS.
• Inositol and other supplements, which have growing evidence for insulin and ovulation. See inositol for PCOS and the best supplements for PCOS.
• Fertility treatment if you are trying to conceive.

No treatment is one-size-fits-all. The right choice depends on your priority symptoms and your stage of life.

4. Mental wellbeing

PCOS raises the risk of anxiety and depression. This is not “in your head,” it is a real part of the condition and deserves to be taken seriously. Sleep, stress management, and support are part of treatment, not extras.

Living well with PCOS long term

Managed well, PCOS does not stand in the way of a full life or a healthy pregnancy. It mostly asks for consistency over time. The guidelines describe a “lifelong health plan” focused on prevention, of excess weight gain, type 2 diabetes, and heart health, rather than one-off fixes.

The starting point is always the same: understand your own body. That is where everything begins.