Surgical injury, absorption of necrotic tissues or toxin stimulation can cause body temperature at 37.5~37.8℃; another preoperative bowel cleansing is not complete, so that the contents of the intestine can flow out and contaminate the trauma, which can also cause fever; there are more local bacteria in the anus, which can enter the tissue through incision, puncture and any other damage to the skin barrier, leading to infection, and the postoperative trauma is mostly open, so the postoperative trauma The postoperative wounds are mostly open, so the postoperative wounds are highly susceptible to infection and fever. The former is generally not necessary to deal with, the latter two must take timely anti-infection, wound drainage, drug exchange and other therapeutic measures. Etiology: ① Drug reaction. Such as the application of hemorrhoids or local injection of hemorrhoids liquid, etc., are prone to drug-related temperature increase, but generally in the 38 ℃ or so. (2) Local incision infection or perianal abscess after surgery due to purulent secretions not cleared, resulting in toxin absorption into the blood and resulting in increased body temperature. (3) Temperature increase caused by other complications, especially in elderly people who are vulnerable to respiratory tract infection and urinary tract infection due to their weak constitution. Treatment: ①The fever caused by drug reaction, generally do not need to deal with, wait for the drug slowly absorbed body temperature will gradually return to normal. If the temperature is 38℃ for a longer period of time, oral antipyretic and analgesic drugs or antipyretic and antitoxic drugs can be taken as appropriate. Fever caused by local infection of the trauma should be treated with oral metronidazole or bacterial culture to find out the most sensitive antibiotics. If an abscess is formed locally, promptly incise and drain the abscess to keep the trauma drained. For fever caused by other complications after surgery, such as respiratory tract infection and urinary tract infection, other diseases can be treated at the same time based on the treatment of anorectal diseases.