The degree of pain after anorectal surgery varies. In mild cases, the pain is only localized and slight, with no obvious effect on the whole body, while in severe cases, the pain may cause restlessness, groaning, sweating, and affecting diet and sleep. The nature of the pain is distending, burning, crushing or throbbing pain, etc., which may be persistent or intermittent. Generally, the pain is more serious in 24~48h after surgery, and then gradually relieved. However, the pain may be aggravated by stimulation or injury, such as defecation, dressing change, and so on. Postoperative trauma localized congestion and edema, due to inflammation stimulation, the patient consciously anal drop discomfort or a sense of fullness, because of the drop often caused by the urge to defecate and make the frequency of defecation increase, sometimes want to defecate not to solve or have a sense of urgency and heaviness. Etiology: (1) Surgical injury to the anal opening, anal canal skin and local tissues, so that the traumatic nerve endings are exposed and stimulated to produce pain. (2) After surgery, the wound dressing is too tight or friction wound after defecation, and fecal impaction can cause pain. (3) Postoperative anal edema, the formation of blood clots or wound infection, pus and other pain. (4) Urinary obstruction may aggravate the pain. Treatment: (1) For postoperative pain, first of all, stabilize the patient’s mood, and give analgesic treatment to patients who have just finished surgery. For mild pain, oral analgesic tablets or fenbendazole capsules, 1~2 tablets each time, or 200mg of Cilostro capsules orally, and for severe pain, intramuscular pethidine 50-75mg can be injected. (2) For inflammatory pain, symptomatic anti-infective treatment should be given. (3) Special such as internal hemorrhoids prolapse embedded timely sent back to reset, external hemorrhoids edema combined with thrombus should be cut to decompression and stripping thrombus, anal formation of abscesses given to the incision and drainage of pus. ′ (4) postoperative use of long-acting analgesic methylene blue injection plus bupivacaine liquid local closure can prevent postoperative pain.