Pelvic inflammatory disease also known as PID is an infection caused by a bacteria, virus, or fungus. In most cases pelvic inflammatory disease is caused by a sexually transmitted disease. Some of these disease are gonorrhea and Chlamydia. Pelvic inflammatory disease is usually treated by antibiotics over a long period of time through intravenous methods. If left untreated pelvic inflammatory disease can cause sepsis and eventually lead to an ectopic pregnancy.
When an egg leaves the ovary a cyst is often left in its place. A cyst is a fluid filled pocket when ruptured can spill blood into the abdomen. Blood will cause the peritoneum which is covers the abdomen to become irritated and result in sever abdominal pain. The peritoneum is much like the pleural space covering the lungs in that the peritoneum holds fluid in between its layers in order to assist in free movement of the bowel during digestion. Ruptured ovarian cysts are most commonly caused during sexual intercourse and the pain is felt almost immediately. You must seek a physician immediately.