When the nurse gives the patient a temperature check after surgery and the temperature reaches 38℃, the patient is often worried that there is an abnormal situation. In fact, 38℃ is a normal reaction for a patient who has just undergone surgery. Generally, there is no need for special treatment with drugs, and physical cooling treatment such as warm water wipe is sufficient. Normal human body temperature is 36.5-37.1℃, and surgical patients with more than moderate surgery can have different degrees of fever, generally the increase is about 1 degree, if the increase in body temperature is too large or fever again after recovery close to normal, or fever persists, the doctor will look for the cause. Fever within 24 hours after surgery is often related to metabolic or endocrine abnormalities, hypotension, pulmonary insufficiency and blood transfusion reaction. 3-6 days after surgery, the surgeon will be alert to the possibility of the presence of infection, commonly such as intravenous catheter corresponding infectious fever, urinary catheter complicating urinary tract infection, surgical incision infection, pulmonary infection.