Does endometriosis turn into cancer?

Endometriosis itself doesn't “turn into” cancer in most cases. But the lining of endometriomas (ovarian endometriotic cysts) can, very rarely, develop cellular changes leading to specific ovarian cancer subtypes. Absolute risk stays low — over 97% of people with endometriosis don't develop ovarian cancer.

How much does endometriosis increase ovarian cancer risk?

The relative risk for endometrioid and clear cell ovarian cancers is roughly 1.3-1.9 times the general population. That translates to an absolute lifetime risk of approximately 1.7-2.5% (versus 1.3% baseline) — still low.

Should I have more frequent screenings if I have endometriosis?

Standard endometriosis follow-up already includes regular gynecological care and monitoring of endometriomas — that's the most effective “screening” available. There's no specific cancer-screening protocol recommended for endometriosis beyond standard care. Talk to your doctor about your individual risk profile.

Does removing endometriomas reduce cancer risk?

Surgically removing endometriomas eliminates the tissue where these specific cancers could potentially develop, so it may reduce risk — but ovarian surgery also reduces ovarian reserve. The decision involves balancing cancer risk reduction against fertility preservation. For most people, monitoring rather than prophylactic removal is recommended.

Does hormonal therapy increase or decrease cancer risk?

Hormonal suppression of endometriosis (combined pill, progestins, etc.) appears to be neutral or slightly protective for endometriosis-associated ovarian cancer. Long-term hormonal contraceptive use is generally associated with reduced ovarian cancer risk in the general population.