Fever 10 days after surgery is an abnormal phenomenon, the possible reasons are postoperative wound infection, infection in other parts of the body, necrotic material absorption and other factors. 1. Postoperative wound infection: if the fever is still present 10 days after the operation, it suggests that the infection has been more serious if the wound is infected after the operation. If the postoperative incision is accompanied by accumulation of fluid and pus and fever, it is necessary to open the wound as soon as possible to drain the wound thoroughly, remove necrotic tissues, strengthen the anti-infective treatment, and control the symptoms of fever. 2. Infection in other parts of the body: it is common in the postoperative period due to bed rest and other factors, immunity decline, resulting in respiratory tract, urinary system and other infections. At this time, the infection is often serious, the body temperature is very high, need to be treated with intravenous cefoperazone, moxifloxacin and other strong antibiotics, and intravenous lysergic acid and other drugs to reduce fever. 3. Absorption of necrotic material: some people have more necrotic material remaining in the body after surgery, such as splenectomy. These necrotic substances are gradually absorbed, and the body temperature may rise. Generally, you can take ibuprofen, paracetamol and other drugs to treat, if necessary, need to operate again to remove the necrotic material. There are many reasons for fever 10 days after surgery, so it is necessary to consult a doctor in time to find out the cause of the fever and treat it under the doctor’s guidance.