Most rectal fistulas are caused by repeated inflammation and ulceration of the intestinal mucosa. Repeated inflammation and ulcers in the digestive system will not only affect the absorption of food and nutrients, but will also affect the health of the intestines, which will lead to the obstruction of the blood flow in the intestines, and even the intestinal system of some patients will be ruptured, and will be directly connected to the body surface. Rectal fistula is divided into internal fistula and external fistula, when the broken part of the rectum passes through the abdominal wall, and even communicates with the outside world, then it is called external fistula. In some patients, rectal fistulas are called internal fistulas when the contents of the rectum do not flow out of the abdominal wall. Rectal fistula in the treatment of the cause of the treatment, if necessary, can be treated with surgical methods, and should also regulate the diet, especially to avoid eating spicy, irritating food, otherwise, it will lead to intestinal inflammation aggravated by causing abnormal spasm.