The appearance of anal fistula is a hole. The appearance of anal fistula is a hole, and in the external mouth of the anal fistula continuous or intermittent outflow of a small amount of purulent, mucous, bloody secretions, due to the stimulation of secretions, the skin around the anal fistula often itchy clinical symptoms, a small number of patients can occur perianal eczema. The external mouth of the anal fistula can have feces, gas discharge, the patient fistula drainage is smooth, then no pain, such as the external mouth closure, drainage is not smooth then there will be pain. Patients in the physical examination, generally visible perianal papillary protrusion, in the anal fingerprinting, in the dentate line near the palpable tenderness should be knotted inner mouth. If the low anal fistula, can be touched cord-like fistula, feasible anal fistula incision or excision. If the above symptoms, it is recommended to go to the hospital in time, early formal treatment, follow the doctor’s instructions.