Fever in patients after stent placement in the bile duct may be due to bacteremia, biliary tract infection, and absorbed fever. 1. Bacteremia: intraoperative contrast requires injection of contrast agent, and a certain pressure can exist when injecting contrast agent. If there are bacteria in the patient’s biliary system, it can lead to bacteria entering the bloodstream to form bacteremia, which leads to postoperative fever in the patient. 2. Biliary tract infection: there is a jugular abdominal structure in the area where the bile duct and the intestines are combined, which is usually closed and open when the bile passes through. After bile duct stent surgery, it is equivalent to forcibly exercising the patient’s jugular abdomen to keep open, at this time, the contents of the patient’s intestinal tract or bacteria can enter the biliary system through the biliary stent and bile ducts, which can cause biliary tract infection and fever. 3. Absorption fever: due to the patient after surgery, local bleeding or tissue necrosis decomposition products absorption caused by fever, usually around 38 ℃. If the patient has fever after placing the biliary stent, it is recommended to consult a doctor in time, under the guidance of the doctor, improve the relevant examination, clarify the cause of the disease and standardize the treatment.