The recurrence period of anal fistula is about 1-2 years after anal fistula surgery, which is a disease that can easily recur due to the following reasons: 1. the patient did not change the medication in time after surgery or the medication was not changed properly; 2. the surgery was not very successful because the original internal opening was not found during the surgery; 3. the fistula may have been removed during the surgery and the foreign body or dead space was not removed. The fistula was not removed cleanly during the surgery, leaving a foreign body or dead space in the affected area. The actual fact is that you can find a lot of people who have been in the business for a long time.