Ectopic pregnancy, also known as ectopic pregnancy, can be divided into tubal pregnancy, cervical pregnancy and ovarian pregnancy according to different parts of the ectopic pregnancy, the most common of which is tubal pregnancy, and the etiology of ectopic pregnancy varies in different parts. 1. tubal pregnancy 1. tubal inflammation: if inflammation occurs in the fallopian tube, resulting in partial blockage of the fallopian tube and weakening of the overall function of the fallopian tube, it may lead to ectopic pregnancy; 2. tubal dysplasia: tubal dysplasia or malformation reduces the function of the fallopian tube in transporting pregnant eggs and makes it difficult for fertilized eggs to reach the uterine cavity smoothly; 3. history of tubal surgery: if the fallopian tube is not open after surgery, it may also easily cause ectopic pregnancy; 4. 4. abnormal fertilized egg wandering: if the fertilized egg takes too long to migrate, it can be bedded in the fallopian tube to form tubal pregnancy; 5. tumor compression: pelvic tumor can compress or traction the fallopian tube, which can displace or deform the fallopian tube and obstruct the passage of fertilized egg, which can cause ectopic pregnancy. The specific pathogenesis of cervical pregnancy is still unclear, but it may be related to the normal implantation of the fertilized egg due to damage to the endometrium or changes in the environment of the uterine cavity as a result of excessive fertilization, abortion, cesarean delivery and intrauterine device. One is that the sperm and egg meet and unite at the fallopian tube and fertilization occurs normally, but the egg formed after fertilization flows backwards through the fallopian tube to the ovary and develops on the surface of the ovary; the other may be a defective ovulation of the egg cell, resulting in fertilization in the follicle.