Bleeding 2 months after anal fistula surgery may be caused by anal fistula recurrence, anal fissure, hemorrhoids, perianal abscess and other diseases. 1. anal fistula recurrence: some patients in the surgical treatment of anal fistula, due to defecation stimulation, drainage is not complete may lead to anal fistula recurrence, defecation, repeated stimulation resulting in bleeding. 2. anal fissure: after surgery, the fistula is repaired, but the scar tissue due to fecal stimulation, may lead to rupture caused by anal fissure, bleeding symptoms. 3. Hemorrhoids: after anal fistula surgery, patients may be due to poor bowel habits, sedentary, dietary stimulation and other reasons caused by hemorrhoids, can also lead to bleeding. 4. perianal abscess: after anal fistula surgery due to fecal stimulation, fecal matter may cause infection from the inner mouth, resulting in the formation of perianal abscess, abscess rupture may appear bleeding, pus and other symptoms. When bleeding again 2 months after anal fistula surgery, it is recommended that the patient go to the anorectal department for follow-up in a timely manner to further identify the cause of the targeted treatment, to avoid delaying the aggravation of the condition.