How much does endometriosis affect fertility?

Dr Sarah Jarvis MBE Difficulty becoming pregnant (reduced fertility) is a symptoms of endometriosis. This may be due to clumps of endometriosis blocking the passage of the egg from an ovary to the Fallopian tube. Sometimes, the reason for reduced fertility is not clear. For more information, go to https://patient.info/health/pelvic-pain-in-women/endometriosis