A fertilized egg that lays outside the uterine cavity is known as an ectopic pregnancy, which is usually referred to as a tubal pregnancy. Let’s first understand the normal pregnancy process: the egg and sperm meet in the fallopian tube, develop into a fertilized egg, and then gradually move towards the uterine cavity with the help of the fallopian tube cilia, and then implant in it; if the fallopian tube is inaccessible for various reasons, ectopic pregnancy will easily occur. The causes can be counted as follows; 1. Inflammation of the fallopian tube: it is the main cause of ectopic pregnancy. Mucositis can cause damage to the cilia in the fallopian tube, resulting in a lack of power for the movement of the fertilized egg; or mucosal adhesions in the tube and narrowing of the lumen, resulting in obstruction of movement, commonly caused by Neisseria gonorrhoeae and Chlamydia trachomatis infection; peripheral inflammation can cause adhesions outside the fallopian tube, distorting it and narrowing it, affecting the movement of the fertilized egg, which can be caused by infection after abortion or childbirth to form pelvic inflammatory disease; in addition, for Tuberculosis patients, such as tuberculosis bacillus infection involving the fallopian tubes, are also prone to the formation of ectopic pregnancy. 2. History of tubal surgery: For those who have a history of tubal surgery, the incidence of ectopic pregnancy is 10-20%, such as tubal ring ligation, cutting off sterilization, previous ectopic pregnancy due to electrocoagulation and window extraction, or separation of tubal adhesions and tubalplasty due to infertility, etc., which can lead to ectopic pregnancy due to tubal fistula or adhesion stenosis. For those who have been spontaneously absorbed after conservative treatment of early ectopic pregnancy, the risk of ectopic pregnancy in another pregnancy is still about 10%. In addition, congenital abnormalities of the fallopian tubes, such as dysplasia or abnormal function, mental stress, contraceptive failure, large fibroids of the uterus or ovarian tumors compressing the fallopian tubes can lead to an increased risk of ectopic pregnancy. In recent years, due to the introduction of second births, some older women have favored assisted reproduction techniques (IVF), leading to an increase in the incidence of ovarian, cervical and abdominal pregnancies, which were previously rare.