In endometriosis, tissue that normally lines the uterus is found in other parts of the body, such as the ovaries, fallopian tubes, vagina, cervix, bladder, or intestines. The cause is unknown. Sometimes there are no symptoms.
If symptoms do occur, they may include heavy, painful periods; abdominal or lower back pain; and pain when having a bowel movement.
Treatment may include medication to relieve symptoms, such as pain relievers, hormone therapy, or surgery to remove the tissue or part or all of the organs affected.

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