Ectopic pregnancy, also known as ectopic pregnancy, is, as the name suggests, a pregnancy in which the gestational sac does not settle in the uterine cavity. The main reason for this is due to the abnormal function of the latter structure of the fallopian tubes. For a pregnancy to occur, the egg must unite with the sperm and be transported through the fallopian tubes to the uterine cavity where it lays in the endometrium. Tubal inflammation is the most common cause. Inflammation may cause decreased peristaltic function of the cilia in the fallopian tubes, or may cause blockage or narrowing of the fallopian tubes or may cause tubal cysts, all of which can affect the transport of the fertilized egg into the uterine cavity. Inflammation of the fallopian tubes can be caused by vaginitis, cervicitis, endometritis and other upstream infections, or by a history of uterine operations such as abortion. Ectopic pregnancy is more likely to occur if there has been previous tubal surgery, such as post-sterilization recanalization. Ectopic pregnancy can also be caused by structural abnormalities of the fallopian tubes, such as overgrowth and lack of cilia, as well as psychological factors that may cause tubal spasms and eventually interfere with the delivery of the fertilized egg. The increasing number of assisted reproductive technologies in recent years has also increased the probability of ectopic pregnancy. Occupancies in the pelvic cavity, such as myoma cysts, can also affect the structure of the fallopian tubes, or adhesions of pelvic organs can affect the normal function of the fallopian tubes. All of the above are causes of ectopic pregnancy, which should be treated actively once it occurs to avoid life-threatening hemorrhage due to rupture of the ectopic mass.