Ten days after the operation and fever may be the surgical site wound infection, may also be respiratory tract infection and other diseases. 1. Wound infection: If you are undergoing major surgery such as open heart surgery or craniotomy, it is difficult for the wound to recover completely in a short period of time after surgery, and secondary infection of the surgical wound may occur, which may cause fever, and it is necessary to improve the examination to clarify the cause of the disease and then use targeted medication to fight the infection. 2. Respiratory tract infection: the body’s immunity is low after the operation, and the invasion of bacteria and viruses can cause respiratory tract infection, such as fever, cough, nasal congestion, runny nose and other symptoms, which requires the use of antibiotics or antiviral drugs, such as amoxicillin, oseltamivir, etc. It is recommended that postoperative patients should have a fever after operation. It is recommended that postoperative patients with fever should complete the examination in time and follow the doctor’s instructions to standardize the use of medication.