PCOS stands for polycystic ovary syndrome, a hormonal condition that affects an estimated 10 to 13% of women of reproductive age worldwide. It causes a cluster of symptoms tied to elevated levels of androgens (often called “male hormones,” though all women produce them in smaller amounts), irregular ovulation, and metabolic changes that can ripple through nearly every system in the body.
What Happens in Your Body With PCOS
The central problem in PCOS is that the ovaries produce too many androgens. This overproduction is driven by a feedback loop: the pituitary gland releases too much of a hormone that stimulates the ovaries, and insulin (the hormone that controls blood sugar) amplifies the signal. Insulin acts like a co-pilot in the ovaries, pushing androgen production even higher. It also lowers levels of a protein that normally binds to androgens and keeps them inactive, so more of those hormones circulate freely and cause symptoms.
The adrenal glands contribute as well. In about 20 to 30% of women with PCOS, they pump out extra androgens on top of what the ovaries are already making. Fat tissue plays a role too: insulin triggers fat cells to convert precursor hormones into active androgens, which in turn promote the accumulation of abdominal fat. That extra abdominal fat then worsens insulin resistance, creating a self-reinforcing cycle between high androgens and high insulin that can be difficult to break without intervention.
Common Symptoms
PCOS shows up differently from person to person, but the most common signs fall into a few categories:
- Irregular periods. You might go months without a period, have unpredictable cycles, or experience unusually heavy or prolonged bleeding. Some women stop menstruating altogether.
- Excess hair growth (hirsutism). Coarse, dark hair can appear on the chin, sideburn area, chest, upper thighs, or back. This is the most visible sign of elevated androgens.
- Acne and hair thinning. Persistent acne along the jawline and chin is common, and some women notice thinning hair on the scalp in a pattern similar to male-pattern baldness.
- Ovarian cysts. Small fluid-filled sacs can line the outer edge of the ovaries, visible on ultrasound. Despite the syndrome’s name, not everyone with PCOS has these cysts, and having them alone doesn’t mean you have PCOS.
Symptoms often begin around the time of a first period but can also develop later, sometimes triggered by significant weight gain.
How PCOS Is Diagnosed
Doctors use what are known as the Rotterdam criteria. You need to meet at least two of three conditions: signs of high androgens (either visible symptoms like excess hair growth or elevated levels on a blood test), irregular or absent ovulation, and polycystic-appearing ovaries on ultrasound. Before confirming a diagnosis, your doctor will rule out other conditions that can mimic PCOS, such as thyroid disorders or adrenal gland problems.
Insulin Resistance and Metabolic Risk
Insulin resistance is not part of the official diagnostic criteria, but it affects roughly 65 to 70% of women with PCOS. Among those with a BMI over 30, that figure rises to 70 to 80%. Even lean women with PCOS aren’t immune: 20 to 25% of those with a BMI under 25 still have significant insulin resistance.
This metabolic disruption has real consequences over time. About 25 to 30% of women with PCOS develop impaired glucose tolerance by age 30, and around 8% progress to type 2 diabetes each year. Overall, the prevalence of type 2 diabetes in women with PCOS is roughly seven times higher than in women without it.
Long-Term Health Risks
Beyond diabetes, PCOS increases the risk of several other conditions. When ovulation doesn’t occur regularly, the uterine lining builds up without being shed, which raises the risk of endometrial cancer. One large study found the excess risk was about three times higher than in women without chronic anovulation. Cardiovascular risk factors like high cholesterol, elevated blood pressure, and central obesity also cluster more frequently in women with PCOS, partly because of the ongoing insulin resistance.
PCOS and Mental Health
The psychological toll of PCOS is significant and often underrecognized. A large meta-analysis found that women with PCOS had nearly four times the odds of experiencing depressive symptoms compared to women without the condition. For moderate to severe depression, the odds were even higher, at about four times. Anxiety was even more strongly linked: women with PCOS had more than five times the odds of anxiety symptoms, and over six times the odds of moderate to severe anxiety.
These elevated rates aren’t just a reaction to dealing with visible symptoms or fertility concerns. Hormonal and metabolic changes in PCOS appear to directly affect mood regulation. Current guidelines recommend psychological therapy as a first-line approach, and treating PCOS-specific features like irregular cycles, excess hair growth, and insulin resistance can itself improve mental health symptoms.
Fertility and Getting Pregnant
PCOS is the leading cause of anovulatory infertility, accounting for about 80% of cases where difficulty conceiving is tied to irregular or absent ovulation. But having PCOS does not mean you cannot get pregnant. Many women conceive naturally, and for those who need help, ovulation-inducing treatments are effective.
In one study of women with PCOS undergoing fertility treatment with medication to stimulate ovulation followed by intrauterine insemination, the cumulative clinical pregnancy rate per patient was about 39%, with a live birth rate of 31%. Nearly all of those pregnancies occurred within the first three treatment cycles.
Treatment and Management
There is no cure for PCOS, but the condition is highly manageable. Treatment is tailored to whichever symptoms matter most to you, whether that’s regulating periods, reducing unwanted hair growth, improving fertility, or addressing metabolic risk.
Lifestyle changes are the foundation. Losing even 5 to 10% of your body weight, if you’re carrying extra weight, can be enough to restore ovulation and improve hormonal balance. That means for someone weighing 180 pounds, a loss of 9 to 18 pounds can make a measurable difference. This works in part by lowering insulin levels, which weakens the cycle driving excess androgen production.
Combined hormonal contraceptives are commonly prescribed for women not trying to conceive. They regulate periods, reduce androgen levels, and protect the uterine lining from the buildup that raises cancer risk. For insulin resistance, medications that improve insulin sensitivity help lower both insulin and androgen levels simultaneously. Treatments for excess hair growth range from prescription creams and medications that block androgen effects to laser hair removal. For fertility specifically, ovulation-inducing medications are the standard first step before considering more advanced reproductive technologies.
Because PCOS is a lifelong condition, ongoing monitoring of blood sugar, cholesterol, and blood pressure matters, even when symptoms feel well controlled. The metabolic risks don’t disappear after menopause, so staying on top of these markers remains important at every stage of life.