The causes of ectopic pregnancy are varied, in addition to tubal abnormalities, the common factors of ectopic pregnancy are pelvic inflammatory disease, endometrial thickening, etc., and should be promptly diagnosed to find out the cause of the disease, in order to avoid ectopic pregnancy. 1. Pelvic inflammatory disease: bacteria retrograde into the female reproductive system, will cause pelvic adhesions and inflammation of congestion, resulting in the occurrence of pelvic inflammatory disease, pelvic inflammatory disease will make it difficult for the fertilized egg to bed to the uterine cavity, and also difficult to develop normally, it will be in the uterine cavity outside of the part of the bed and development, which leads to the occurrence of ectopic pregnancy. 2. Thickness of endometrium: Thickness of endometrium can easily cause the fertilized egg to be unable to develop normally in the uterus, which may cause ectopic pregnancy. Women who have ectopic pregnancy should seek treatment in time, do a good job of pre-pregnancy checkups before preparing for pregnancy, and women who suffer from inflammation or other diseases must be cured before getting pregnant, which can effectively reduce the probability of ectopic pregnancy.