More than 2 months after the anal fistula surgery, the wound suddenly flow of pus and blood, mostly due to pseudo-healing, secondary infection, anal fistula recurrence and other factors, should be timely consultation to identify the cause of the disease. 1. False healing: due to the healing process of anal fistula, internal and external mouth healing, internal pus can not be discharged in a timely manner, resulting in inflammation continues to infiltrate, break through the external mouth, can appear after anal fistula surgery more than two months wound suddenly pus and blood symptoms. 2. secondary infection: mostly due to incomplete hygiene cleaning, germs invasion, moisture and other factors, resulting in surgical incision site inflammation infiltration, invasion of the surrounding soft tissues and blood vessels, can cause anal fistula surgery more than two months after the wound suddenly flow of pus and blood symptoms. 3. anal fistula recurrence: mostly due to bad habits are not corrected or low immunity and other factors, resulting in the formation of local abscesses again, due to the incision site tissue is relatively weak, the abscess is easier to break through, resulting in anal fistula surgery more than two months after the wound suddenly pus and blood symptoms. In daily life, avoid intake of spicy stimulating food, should pay attention to personal hygiene, adhere to the sitz bath, if there is a sudden flow of pus and blood symptoms, should go to the hospital in a timely manner, by the doctor to clarify the cause of the disease as soon as possible to give treatment to avoid aggravation of the condition.