Itching after anal fistula surgery can be considered to be the normal state after anal fistula surgery, infection after anal fistula surgery, and scar formation after anal fistula surgery. 1. Normal state after anal fistula surgery: after anal fistula surgery, the wound wound can secrete purulent secretions. The secretion liquid can produce stimulation to the skin around the incision, resulting in perianal in a moist state, which leads to itching, eczema and other symptoms, the situation is a normal state. 2. Post-operative infection: when the wound after anal fistula surgery is infected with bacteria or fail to keep the perianal area clean after defecation, it can lead to the occurrence of post-operative infections, which can lead to itching after anal fistula surgery. 3. postoperative scar formation: when the postoperative healing of anal fistula scar formation, can lead to anal closure is not tight, so that the intestinal fluid in the rectum leaked out of the anus, resulting in perianal moist, itching and other symptoms. When itching occurs after anal fistula surgery, it is recommended that the anal skin should be cleaned regularly to keep the anal area dry. At the same time, should pay attention to diet, keep bowel movement. If the symptoms are serious, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor to carry out targeted treatment, to avoid delaying the condition.