Postoperative fever may be normal, or it may indicate wound infection, upper respiratory tract infection, pneumonia and other abnormalities. Postoperative fever may be physiologic fever. In the clinic, some postoperative patients will have normal fever response, mainly due to the absorption of sterile necrotic material, which is called absorption fever, and it is usually a low fever, and high fever does not occur, so postoperative fever may be normal. However, if the postoperative fever has a high temperature and does not subside for a long time, it may be caused by a postoperative infection. The most common is usually a wound infection, at which time the wound may show redness, swelling, and inflammatory exudate. It may also be due to the patient’s postoperative weakness and complications of upper respiratory tract infection, pneumonia, etc., causing fever symptoms. It is recommended that the patient’s family consult the doctor in time, under the guidance of the doctor to deal with, so as not to aggravate the symptoms, the patient’s body harm.