Bleeding after four months of anal fistula surgery is due to pseudo-healing and recurrence. 1. Pseudo healing: pseudo healing may be due to incomplete surgery and postoperative rehabilitation is not scientific, there is adhesion and fusion in the middle of the wound, but underneath it is a cavity, and the swelling around the anus is easy to appear, and when a small abscess breaks out in the perianal area, it will lead to pus flow and bleeding. 2. recurrence: anal fistula recurrence of the first symptom is pain, followed by lumps around the anus, and accompanied by obvious symptoms of pus, mucous color yellow secretion, if after four months of local bleeding, pus symptoms, it is a recurrence of anal fistula. When the patient’s anal fistula surgery four months later, or bleeding symptoms, should promptly seek medical attention, a clear diagnosis, under the guidance and advice of the doctor for treatment. Avoid aggravation of the condition.