Three months after the anal fistula surgery and blood, may be due to infection, hemorrhoids, anal fissure and other factors, the specific circumstances need to be judged under the guidance of the doctor. 1. Infection: anal fistula patients in the surgical process disinfection awareness is not strong or do not pay attention to personal hygiene after surgery, easy to lead to bacterial infection, due to the stimulation of inflammation, the wound healing is poor, there may be three months of surgery and the phenomenon of blood. 2. hemorrhoids: anal fistula patients in the post-surgery, prolonged sedentary, may lead to poor local blood circulation, blood stasis in the rectal venous plexus, so that the varicose veins, thus inducing hemorrhoids, the phenomenon of local blood. 3. anal fissure: anal fistula patients after treatment, long-term consumption of too spicy, stimulating food, may lead to gastrointestinal peristalsis slowed down, intestinal water is absorbed, so that the stool is dry, in defecation, too hard, will lead to the patient bleeding phenomenon. Anal fistula patients in three months after surgery and blood, generally does not belong to the normal phenomenon, it is recommended to consult a doctor in time to check, to clarify the cause of the disease, and under the guidance of the doctor to give treatment, to avoid aggravation of the condition.