Bleeding three days after anal fistula surgery may be related to the open incision and local blood vessel rupture and other factors. If the amount of bleeding after anal fistula surgery is small, this is a normal physiological phenomenon, because the incision used in anal fistula surgery is mostly open incision, when defecation due to friction, local tearing of the anus and other factors that can cause a small amount of local bleeding phenomenon, usually after the bleeding can disappear on its own. If the amount of bleeding after anal fistula surgery is large, patients still have persistent blood seepage from the wound after the stool, this time there may be local small blood vessel rupture, resulting in bleeding phenomenon. In this case, we need to consult a doctor in time, if necessary, can be in the local suture to stop bleeding. In order to avoid postoperative bleeding, patients should pay attention to a reasonable diet, quit smoking and drinking, maintain a regular routine, keep bowel movement, and actively cooperate with the treatment; in the case of a large amount of bleeding in a timely manner to avoid the adverse effects of postoperative medical treatment.