There are many reasons for fever after gallbladder cancer surgery, part of which is infection, part of which is the patient’s combined gallstones or other problems. When gallbladder cancer is combined with gallstones, there are some stones in the bile ducts, especially at the end of the bile ducts, in addition to the stones in the gallbladder. If there is proper drainage, it will not occur in general, but if there is no drainage or no drainage, bile will collect in the abdominal cavity, which will cause abdominal infection and fever in the patient. Therefore, the causes of fever are multifaceted and need to be investigated from several angles.