Anal fistula is a common anorectal disease, the possibility of recurrence after surgery is also very high, the main method of judgment is based on the patient’s symptoms and local anal examination. 1. Patient symptoms: the first symptom of anal fistula recurrence is pain, followed by a lump around the anus, accompanied by obvious pus symptoms, sticky yellow secretion, if the lump appears around the anus after the operation, indicating pseudo-healing, if the local bleeding and pus for a long time, it means that anal fistula has recurred. 2. local examination: through the rectal ultrasound or perianal MRI, you can understand whether there is pus formation around the anus, symptoms of infection, to determine whether the anal fistula recurrence. When the anal fistula recurs after surgery, you need to consult a doctor in time, under the guidance and advice of the doctor for the next step in the treatment, to avoid aggravation of the condition, causing adverse consequences.