Most ovarian cysts are part of the normal functioning of the ovary. Other cysts are growths that need to be removed. This can cause painful bleeding into the ovary. Endometriosis is a condition in which the type of tissue that lines the uterus implants in locations outside the uterus. This typically cause pelvic pain around the time of the menstrual period, but can cause pain at other times in the cycle.
Fibroids are benign growths in the muscle of the uterus.
Fibroids are very common, and usually are not painful. Some fibroids can cause pelvic pressure and pain. Click here to learn more about fibroids. Infection can also be caused by other bacteria. Infection of the fallopian tubes is called salpingitis.