There are many causes of ectopic pregnancy, but the most common and major causes are as follows: 1. inflammation: inflammation of the fallopian tubes, including peritubal inflammation and mucositis; 2. tubal dysplasia or congenital anomalies: for example, some people have overly long or slender fallopian tubes, abnormal cilia cell development or paraplegia; 3. history of pregnancy or surgery in the fallopian tubes: for example, the patient has had ectopic pregnancy or These patients are prone to ectopic pregnancy; 4. contraceptive failure: including failure of oral contraceptive pills or intrauterine device; 5. assisted reproductive technology: nowadays, there are many IVF cases, but there are also risks, one of which is ectopic pregnancy; 6. tumor compression: for example, ectopic pregnancy can be caused by uterine fibroids or large ovarian cysts pressing on the fallopian tubes. .