Some people are afraid of surgery, thus delaying it again and again, even for decades, resulting in many complications. From clinical observation, the most common complications with fistula survival are the following 1, anorectal stenosis: anal fistula lesions often invade the end of the anal, anal canal, rectal wall, so that connective tissue hyperplasia, the formation of a circular or semi-annular scar, due to repeated inflammatory stimulation over the years resulting in scar contracture, so that the anal, anal canal, rectal cavity narrowing, so that the stool occurs thinning, flattening, difficult to defecate, and even bloating, nausea, vomiting and other symptoms of intestinal obstruction, clinical examination, found that the anal canal or rectum has During clinical examination, it is found that there is obvious scarring in the anal canal or rectum, the anus is tight, and even the index finger is difficult to pass, and individual patients have scarring bulge at the end of the rectum, similar to the signs of rectal cancer, which is easily misdiagnosed. Some people think they have habitual constipation without examination, and the effect of treatment with a lot of Chinese and Western medicines is not obvious; some people mistakenly think they have an intestinal tumor and are terrified, but in fact, the clinical investigation is due to chronic inflammation of the fistula. 2, incomplete anal incontinence: due to repeated attacks of anal fistula, resulting in extensive infection of the muscles and soft tissues around the anal canal rectum, a large number of connective tissue proliferation, hardening, so that the loss of elasticity around the anus, thus affecting the anal closure function, sometimes it is difficult to control the thin stool, resulting in incomplete anal incontinence. 3, anal chronic eczema: due to repeated attacks of anal fistula, fistula often has secretions overflow, long-term stimulation of perianal skin, resulting in chronic perianal skin eczema, skin malnutrition, elastic fading, often forming a wide range of perianal chap-like changes, the patient itch unbearable. 4, anal fistula cancer: clinical observation and domestic and foreign literature reports, anal fistula more than ten years prone to cancer, generally believed to be related to the long-term chronic inflammatory stimulation of anal fistula. It is possible that the destruction of the lymphatic structure in the local area has led to a decrease in the ability of cellular immune monitoring, resulting in the gradual cancerous transformation of the fistula tissue. The data show that if the fistula originates from the anal gland, it is more likely to be an adenocarcinoma. The more time it takes, the more maladies there will be and the more likely complications will arise.