Disorder of the female reproductive system in which endometrium (uterine lining) grows in an abnormal location because some endometrial fragments traverse the fallopian tubes into the abdominal cavity and become embedded on structures there, usually the ovaries, rather than exiting the uterus via the vagina (during menstruation). Symptoms include pain on menstruation, sexual intercourse, defecation, and/or urination; heavy menstrual flow; blood in the urine; and infertility. Diagnosis is best made by laparoscopy. Treatment includes surgery and hormones to suppress ovulation for six to nine months.

This entry comes from Encyclopædia Britannica Concise.
For the full entry on endometriosis, visit Britannica.com.

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