The common causes of fever after total gastrectomy include poor resistance of the patient, decomposition of damaged tissues after surgery and excessive consumption of tumor. 1. Poor resistance: Considering that the patient’s body resistance is relatively poor after surgery, the temperature may rise due to cold, bacterial, viral infection and other factors, which should be combined with the cause of the disease to carry out targeted treatment. 2. Decomposition of damaged tissues after surgery: the damaged tissues decompose and are absorbed by the body after total gastrectomy, causing inflammatory reaction to appear, fever, abdominal pain and other symptoms. 3. Over-consumption of tumor: the growth of tumor will cause over-consumption of body, which will cause metabolic disorder of the body, and symptoms such as decreased resistance, fever, loss of appetite, edema, anemia, etc. will appear. There are many factors affecting the total fever after total gastrectomy, it is recommended to go to the hospital in time to clarify the cause of the disease for targeted treatment to avoid further aggravation of the condition.