Low fever becomes high fever after cardia surgery, which is usually related to infection, perforation and other factors; if there is malignant tumor and high fever after surgery, it is considered to be caused by the stimulation of the organism by cancer cells. General treatment, drug treatment or surgical treatment should be taken according to the etiology, and the fever should also be reduced actively. 1. Postoperative infection: for example, postoperative infection with bacteria, virus and other microorganisms, which stimulate the organism repeatedly will cause fever and fever. For bacterial infections, cefixime can be taken orally, and for viral infections, ribavirin can be taken orally. When the temperature exceeds 38.5 degrees, oral ibuprofen suspension should be taken. 2. Intestinal perforation: cardia surgery is more traumatic, easy to cause intestinal perforation after surgery, if the degree of perforation is relatively large, need to be operated as soon as possible. When the fever is high, you can take ibuprofen and acetaminophen by mouth. 3. Cancer fever: mainly for pancreatic cancer patients after surgery, if it is determined that the cancer cells are gradually increasing and causing fever, radiotherapy should be taken as soon as possible to inhibit the cancer cells, and chemotherapy drugs can be cisplatin and paclitaxel. If the temperature exceeds 38.5 degrees, oral ibuprofen can be taken to reduce fever. If the fever does not go down after pancreatic surgery, it is recommended to consult a doctor as soon as possible and understand the cause of fever under the guidance of a professional doctor, and then carry out regular treatment; if medication is needed, it should be taken in accordance with the requirements of a doctor and avoid taking it without authorization.