It is mostly caused by perineal diseases and can be divided into colorectal diseases and gynecological pelvic lesions according to the site of onset: 1, colonic and rectal infectious diseases, such as acute enteritis, bacterial dysentery, Escherichia coli infection, food poisoning, amoebic dysentery, etc. 2, gynecological pelvic lesions, such as gynecological inflammation, ectopic pregnancy rupture, uterine adenomyosis, appendicitis, pelvic The patient needs to pay attention, reduce squatting time, wash the perineum and perianal area in time after defecation, adjust the diet, increase the intake of fresh fruits and vegetables, eat less or no spicy stimulating greasy food, drink more water, strengthen their own exercise, improve their own quality, and actively treat perianal, colorectal and gynecological diseases.