How PCOS is connected to endometrial cancer
PCOS Does Not Automatically Become Cancer
PCOS is a recognized risk factor for endometrial hyperplasia and endometrial cancer, but most people with PCOS do not develop cancer. The connection is best understood as a risk pathway, not a direct or inevitable progression. [NCI; NICHD]
The Risk Pathway
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PCOS can cause infrequent or absent ovulation.
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Without regular ovulation, the body may not produce enough progesterone to balance estrogen’s effect on the uterine lining.
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The endometrium may continue to grow without shedding regularly.
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Over time, this can contribute to endometrial hyperplasia; some forms of hyperplasia can progress to cancer.
Insulin resistance, obesity, diabetes, and metabolic syndrome—conditions that can occur with PCOS—may add to risk. These factors overlap, so no one factor explains every case. [NCI; NICHD]
What You Can Do
Track your bleeding pattern. Do not assume months without a period are harmless. Ask your clinician how your uterine lining should be protected if periods are infrequent. Keep recommended follow-up for blood pressure, cholesterol, and diabetes risk. Discuss safe movement, nutrition, sleep, and weight-support goals without stigma. Never start hormones, supplements, or insulin-sensitizing medicine solely for cancer prevention without medical guidance.