Tubal occlusion is the most common factor causing infertility, and inflammation of the pelvis is a common cause of tubal occlusion. There are many causes of tubal blockage, the most common being tubal occlusion caused by inflammation of the fallopian tubes (chlamydia, gonorrhea, Mycobacterium tuberculosis, etc.) or destruction of the mucosa of the fallopian tubes. Inflammation of adjacent organs, such as appendicitis, can also spread to the fallopian tubes, and secondary infections caused by postpartum, post-abortion, post-scraping, etc. can also lead to tubal blockage; secondly, there are congenital tubal dysplasia and tubal blockage caused by congenital defects; there is also tubal blockage caused by endometriosis, which refers to the endometrium planted in the ovaries, fallopian tubes, pelvic cavity, peritoneum, etc., which can lead to adhesion of tissues and can cause tubal blockage when it is implicated in the fallopian tubes; of course, there are also medical conditions that can cause tubal blockage. Of course, there are also medical causes, such as tubal ligation, and the less common mechanical blockage, which refers to pseudo blockage caused by dislodged emboli or short term spasm of the fallopian tubes. In order to reduce the occurrence of tubal blockage, it is important to pay attention to sexual hygiene, timely treatment of gynecological inflammation, good contraceptive measures and reduce the number of abortions.