The main conditions that can lead to ectopic pregnancy are inflammation and tubal abnormalities. The main site of ectopic pregnancy is tubal pregnancy, accounting for more than 90% of ectopic pregnancy. 1. Inflammation: when patients have inflammation such as chronic pelvic inflammatory disease, tubalitis, etc., the inflammation can lead to tubal adhesion, causing unfavorable tubal peristalsis or tubal incompetence, sperms can’t pass through the tubes to reach the designated site, so it will cause ectopic pregnancy. 2. Tubal abnormality: when tubal deformity or developmental abnormality, the tubes can not make the sperm or fertilized egg pass through normally, so it will lead to ectopic pregnancy. Ectopic pregnancy patients often have abdominal pain, irregular vaginal bleeding and other symptoms, should go to the hospital in time for examination, under the guidance of professional doctors for treatment.