The short answer
This page explains how polycystic ovary syndrome relates to cancer risk, especially endometrial cancer, and what can lower that risk. It is general education, not individual medical advice.
Federal health agencies link PCOS to an increased risk of endometrial cancer, the cancer of the lining of the uterus.
The link runs through problems with ovulation, obesity, insulin resistance, and diabetes, which are all common in PCOS.
Hormonal contraceptives that combine estrogen and progestin lower the risk of endometrial cancer, according to NCI.
Having PCOS does not mean you will get cancer, and managing weight, blood sugar, and cycles are the levers to discuss with your care team.
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PCOS and cancer risk are connected mainly through one cancer type. That is endometrial cancer, the cancer of the uterine lining. Federal health agencies list polycystic ovary syndrome (PCOS) among the conditions linked to a higher risk of this cancer. The link is real, but it is not a prediction. Several of the things that drive it can be managed.
What PCOS is
The HHS Office on Women's Health (OWH) describes PCOS as a health problem that affects 1 in 10 women of childbearing age. Put another way, between 5% and 10% of women ages 15 to 44 have it. The exact cause is not known. Two features stand out. One is high levels of androgens, which are hormones such as testosterone. The other is high levels of insulin, the hormone that regulates blood sugar.
The National Institute of Child Health and Human Development (NICHD) says clinicians look for two or more of these features:
- Absence of ovulation, leading to light or skipped periods
- High androgen levels
- Follicle growths in one or both ovaries Ovulation means the release of an egg. With PCOS, OWH explains, the egg may not develop as it should. Or it may not be released as it should be.
Why PCOS is linked to endometrial cancer
NCI lists PCOS among conditions linked to a higher risk of endometrial cancer. OWH pulls the threads together in one sentence. Problems with ovulation, obesity, insulin resistance, and diabetes, all common in women with PCOS, raise the risk of cancer of the endometrium.
The hormone piece matters here. NCI notes that estrogen, a hormone made by the body, can affect the growth of some cancers, including endometrial cancer. When ovulation is skipped, cycles become irregular. The lining of the uterus is then not shed on a regular schedule.
The metabolic piece stacks on top. NCI states that having obesity, or gaining weight as an adult, raises the risk of endometrial cancer. It says type 2 diabetes may raise it too. Both are more common with PCOS. OWH reports that more than half of women with PCOS will have diabetes or prediabetes before the age of 40.
What is not established
The federal pages we reviewed name endometrial cancer as the cancer linked to PCOS. They do not list ovarian cancer, breast cancer, or other cancer types as established PCOS risks.
PCOS does bring other long-term health concerns. MedlinePlus lists type 2 diabetes, heart disease, high blood pressure, abnormal cholesterol, sleep apnea, depression, and anxiety. Those deserve attention in their own right.
One more thing risk language cannot do: tell you what will happen to you. NCI frames avoiding risk factors as a way that may help prevent certain cancers, not a guarantee. Likewise, having a risk factor does not mean cancer is certain.
Steps that lower risk, to discuss with your team
- Regulating cycles. OWH lists hormonal birth control among the medicines used to treat PCOS. NCI states that hormonal contraceptives combining estrogen and progestin decrease the risk of endometrial cancer. Whether this fits you is a decision to make with your care team.
- Weight and blood sugar. Obesity and type 2 diabetes each raise endometrial cancer risk. OWH names lifestyle changes, especially weight loss, and medicines as the main ways to manage PCOS.
- Moving more. NCI notes that physical activity may lower the risk of endometrial cancer.
- Screening for diabetes. Prediabetes is common in PCOS. Ask when and how often your blood sugar should be checked.
Symptoms worth reporting
Irregular bleeding is common in PCOS. That can make it hard to know what is normal for you. Two changes are worth reporting to your care team rather than watching. The first is a bleeding pattern that clearly changes from your usual. The second is any bleeding after menopause. Persistent new changes still deserve evaluation, so that whatever is behind them can be found and addressed. Our page on common signs of endometrial cancer covers this in detail.
Sources
Common questions
Does PCOS cause cancer?
PCOS is linked to a higher risk of endometrial cancer, according to NCI and the HHS Office on Women's Health. A risk factor is not a cause in any one person, and most risk can be discussed and managed. Having PCOS does not mean cancer will develop.
Why would PCOS raise endometrial cancer risk?
The Office on Women's Health says problems with ovulation, obesity, insulin resistance, and diabetes, all common in women with PCOS, increase the risk of developing cancer of the endometrium. NCI notes that estrogen can affect the growth of some cancers, including endometrial cancer.
Is PCOS linked to ovarian or breast cancer too?
The federal pages we reviewed name endometrial cancer as the cancer linked to PCOS. They do not list ovarian or breast cancer as established PCOS risks. If you have a family history of those cancers, raise it with your care team separately.
Can birth control pills really lower cancer risk?
NCI states that hormonal contraceptives combining estrogen and progestin decrease the risk of endometrial cancer. The Office on Women's Health lists hormonal birth control among the medicines used to treat PCOS. Whether they fit your situation is a decision for you and your care team.
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Sources last checked: 2026-08-21 what this meansLast updated: 2026-08-21Next planned review: 2027-08-21
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Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes, and this is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Source checked — This page was written with AI assistance and then compared with the sources listed on it, looking for statements those sources do not back up. That check is not a sentence-by-sentence record and can miss errors. It is not a medical review, and it does not confirm the page is complete or right for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
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