What is endometriosis?
The word "endometriosis" (say: "end-oh-me-tree-oh-sis") means a problem with the lining of the uterus. The lining is called the endometrium or endometrial tissue. Normally, every month when you have your period, the lining comes out in your menstrual flow.
Endometrial tissue is usually only inside your uterus. However, if you have endometriosis, tissue from the lining of the uterus may move through the fallopian tubes and get on your ovaries, in your pelvis, on your bladder or in other areas. When you have your period, this tissue swells and bleeds, just like the lining of your uterus. This is often painful, and scar tissue can form in your pelvic area.
Written by familydoctor.org editorial staff