Going to have to correct you sushee.

When you suffer Endometriosis, your period (in my case this happened) regurtitates back inside of you and comes out of your fallopian tubes, as well as coming out the way it is meant too leaving endometrial tissue outside of your uterus.

This misplaced tissue develops into growths or lesions which respond to the menstrual cycle in the same way that the tissue of the uterine lining does: each month the tissue builds up, breaks down, and sheds. Menstrual blood flows from the uterus and out of the body through the vagina, but the blood and tissue shed from endometrial growths has no way of leaving the body. This results in internal bleeding, breakdown of the blood and tissue from the lesions, and inflammation -- and can cause pain, infertility, scar tissue formation, adhesions, and bowel problems.

Hope that helps

Love