After anal fistula surgery at night pain to sleep, you can take pain medication, avoid infection, keep bowel movement and other ways to ease the treatment. 1. take pain medication: after anal fistula surgery will appear in the affected area of the pain, the patient can use ibuprofen and other drugs under the guidance of the doctor for pain relief, if the symptoms can not be relieved, you can take tramadol and other drugs to relieve the pain. 2. Avoid infection: patients should do a good job in the postoperative care, to avoid infection, resulting in pain aggravation, patients can be under the guidance of the doctor, the use of 1:5000 potassium permanganate solution for cleaning the affected area sitz bath, is conducive to anti-inflammatory and bactericidal. 3. Keep the bowel clear: patients in the postoperative period to avoid the occurrence of constipation, eat more fresh fruits and vegetables, avoid eating stimulating, greasy, spicy food, avoid constipation and other conditions, the wound caused by stimulation to aggravate the pain. After anal fistula surgery, patients should follow the doctor’s instructions to do a good job of nursing and medication, discomfort symptoms need to be timely medical treatment to avoid aggravation of the condition.