After anal fistula surgery will be accompanied by anal falling sensation, may be a normal postoperative phenomenon, but also consider the postoperative trauma infection and other pathological reasons, it is recommended that the patient consult a doctor in a timely manner to check, choose the appropriate treatment program. In the process of anal fistula surgery, perianal skin and mucous membrane by surgical injury, easy to produce anal falling sensation, and the surgical process may damage the anal sphincter, aggravate the falling sensation; on the other hand, due to the anal fistula for infectious diseases, perianal tissues are susceptible to contamination by feces and other pollutants, resulting in traumatic oedema, resulting in a falling sensation. It is generally recommended that the patient under the guidance of the doctor, the use of 1:5000 potassium permanganate solution and other sitz baths to achieve swelling, anti-inflammatory, pain relief, or with hemorrhoid ointment, hemorrhoid pessary and other local medication, to ease the discomfort of the perianal area. The above situation, it is recommended to first exclude the normal postoperative reaction, timely to the hospital for examination, to clarify the cause of the disease, to avoid delaying the condition, follow the doctor’s instructions.