Lung infection after gastric cancer surgery is usually necessary to save, and the possibility of bacterial or viral infection is generally considered to be high, and most patients can be cured of lung infection after standardized treatment. Gastric cancer is cancer of stomach originated from gastric mucosa cells, and its etiology is related to Helicobacter pylori infection, precancerous lesions, heredity, environment, improper diet and other factors. If patients with gastric cancer develop lung infection after surgery, they usually need to take treatment measures. For lung infection caused by bacterial infection, patients can take oral antibiotic drugs, such as amoxicillin, cefonicid, etc. under the instruction of doctor. For viral infections, oral oseltamivir, zanamivir, etc. can be taken as prescribed by the doctor, and most of the patients can achieve the effect of eradication after standardized drug treatment. The prognosis can be improved and the quality of life can be enhanced. In daily life, patients with gastric cancer need to have balanced diet, choose high protein, high vitamin, high calorie, easy to digest or semi-liquid diet. Reduce the intake of spicy and stimulating food, and quit smoking and drinking at the same time. Please strictly follow the doctor’s instructions for medication, do not self-medicate.