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Animation showing the cause and effects of endometriosis. The view zooms in to show the woman's reproductive system, including her bladder (yellow), uterus (red) and ovaries (white). The uterus opens to show the endometrium (red), the tissue that lines the inside of the uterus. The endometrium is seen extending out of the fallopian tube, past the ovary, and then grows in several places within the abdominal cavity. Even outside the uterus, the endometrium responds to the normal monthly hormonal cycle, and the misplaced tissues grow and bleed monthly. This causes intense pain in the pelvic region, and can lead to infertility. Endometriosis is common, with as many as 10% of women affected