Endometriosis is a painful condition in which the tissues that line the inside of the uterus also grow outside the uterus cavity. The lining of the uterus is called the endometrium. Endometriosis most commonly involves your bowel, ovaries, fallopian tubes, and the tissues that surround your pelvis. Endometrial-like tissues are hardly located beyond the area where pelvic organs are there. If endometrial tissue spreads outside of the uterus, it is called an endometrial implant.

Also, monthly changes in your hormonal cycle affect the misplaced endometrial tissue, making the area inflamed and painful. This employs that tissue will grow, stiffen, and break down. If the tissue that broke was not disposed of, it becomes trapped in the pelvis area.

If endometriosis gets into ovaries, cysts called endometrial tissue might develop. In fact, the surrounding tissue to endometriosis may become scarred and inflamed or infected.