By Clare Knight, B.Sc.Reviewed by Emily Henderson, B.Sc. What is Endometriosis? Endometriosis is a condition defined by the presence of endometrial glands and stroma in areas outside of the uterus, typically in the ovaries, peritoneum, and the rectovaginal septum. At the beginning of the follicular phase of the menstrual cycle, these cells react similarly to those within...
