Some patients will have absorbing fever within the first 3 days after the procedure. If the temperature is not very high, do not worry too much. If the fever persists or is recurrent, the cause should be actively sought. The causes of recurrent fever after surgery are commonly the following: 1. The patient himself is operated for infectious diseases and the infection foci cannot all be surgically removed. For example, septic perforation of appendicitis, formation of infection in the abdominal cavity, peritonitis. Surgery can remove the appendix to flush the abdominal cavity, but abdominal infection control also needs late antibacterial drug treatment for a period of time: 2, the surgical site or incision infection, the patient’s original surgical site is not infected, but the surgical trauma will lead to the destruction of the skin mucosal barrier, the patient’s immunity is reduced, there may be surgical infection; 3, tension, poor rest, after surgical trauma or tracheal intubation catheterization invasive operation Non-surgical site infections may then occur. For example, appendectomy, lung infection, urinary tract infection situation; 4. The patient’s original febrile disease appears repeatedly, such as lupus erythematosus which is originally feverish. In patients with these diseases, the immune system may be aggravated by the surgical blow, and the original routine amount of medication may be insufficient, leading to fever again; 5. Drugs or built-in materials, etc. may sometimes lead to fever. In conclusion, recurrent fever after surgery is a complex situation, and the cause should be found for the specific patient.