Endometriosis is a very serious female condition that is a cause of infertility. In cases that result in endometriosis, the endometrial tissue that is inside of the uterus grows outside and attaches to other organs, such as the ovaries and fallopian tubes. Unfortunately, this disease worsens with time and does tend to reoccur even after treatment.

The symptoms of this condition can include very painful periods, heavy amounts of menstrual bleeding and pain during intercourse. Ovarian cysts are another side effect of endometriosis and they can be very painful as well. They interfere with ovulation and cause excessive amounts of bleeding, even when you're not on your period.