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A condition in which tissue that normally lines the uterus grows in other areas of the body, usually inside the abdominal cavity, but acts as if it were inside the uterus. Bloodshed monthly from the misplaced tissue has no place to go, and tissues surrounding the area of endometriosis may become inflamed or swollen. This can produce scar tissue. Symptoms include painful menstrual cramps that can be felt in the abdomen or lower back, or pain during or after sexual activity, irregular bleeding, and infertility.