An ectopic pregnancy is one where there is abnormal implantation of the embryo outside of the womb (uterus). Development most commonly occurs in the fallopian tubes but can also take place in the ovary or cervix. In the scenario where there is abnormal implantation, the developing fetus cannot survive. Many cases are caused by blockage of the fallopian tube, which impedes the transit of the fertilized egg to the uterus. A history of pelvic infections or past surgery on the tubes can cause this condition, although sometimes the cause is unknown. Symptoms of an ectopic pregnancy include pelvic pain and abnormal bleeding. Both medical and surgical treatments are available for this serious complication of pregnancy.