In endometriosis, the endometrial cells lining a woman's uterus are also located outside the uterus - most commonly on the ovaries, Fallopian tubes, and other areas in the pelvic cavity. In rare cases, the cells spread beyond the pelvic region. The most common symptoms are pelvic pain and abnormal bleeding. Women with endometriosis often have trouble becoming pregnant; multiple reasons have been suggested, including anatomical changes and problems related to hormone production.
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