The main symptom of anal fistula is fluid flow from the anus, which can be combined with redness, swelling and pain in the anus, and even an increase in body temperature. It is a common name for an anal fistula, which is caused by an infection in the anus and consists of an internal fistula, a sinus tract and an external fistula. When the disease is detected, it needs to be treated as soon as possible with surgery in a hospital’s general surgery department, or anorectal surgery. The fistula is usually removed under anesthesia and the medication is changed regularly. If the condition is severe, the fistula should be sutured and treated with antibiotics, such as cephalosporin or penicillin, at a later stage. The most important thing is to avoid alcoholic beverages and spicy foods during the treatment period, and to consume fresh fruits and vegetables and sitz baths.