Gastric cancer is the most common malignant tumor in China. Its histological types include adenocarcinoma, adenosquamous carcinoma, squamous carcinoma, hepatocellular adenocarcinoma, mural cell-like adenocarcinoma, undifferentiated carcinoma and carcinoid carcinoma. It is most commonly found in the pyloric region of the human body, followed by the lesser curvature of the stomach and then the cardia, with the greater curvature and fundus of the stomach being less common. There are more men than women with this disease, and the higher the location of gastric cancer, the greater the ratio of men to women. The mortality rate of gastric cancer is low below 35 years old, but increases rapidly after 40 years old, and accounts for 70% of cases above 55 years old. Early stage of gastric cancer has no obvious manifestation or even no feeling, but in the middle and late stage, obvious gastrointestinal symptoms may appear, but they are not characteristic. The main manifestations of gastric cancer are: stomach pain, loss of appetite, emaciation, weakness, nausea, vomiting, bleeding and black stool, upper abdominal pressure pain and lump, etc. Gastric pain is the most common symptom of gastric cancer. The nature of pain is non-specific and is mostly suspected to be chronic gastritis or peptic ulcer first. Loss of appetite, emaciation and weakness can sometimes be the first symptoms of gastric cancer. Etiology and risk factors: nitroso compounds, polycyclic aromatic hydrocarbon compounds, Helicobacter pylori, high salt diet, chronic atrophic gastritis, intestinal epithelial hyperplasia of gastric mucosa, long-term untreated heterogeneous hyperplasia of gastric mucosa and long-term recurrent gastric ulcers can trigger carcinogenesis. Pre-operative instructions: It is very important to maintain a calm mood, eliminate tension and fear, and pay attention to rest and sleep before surgery. Your supervising nurse will explain to you about the disease and the surgery to help you increase your confidence in the treatment. Please pay attention to small and frequent meals, eat high-calorie, high-protein, vitamin-rich, easy-to-digest, non-irritating food, such as meat porridge, egg custard, soup, etc. Quit smoking and alcohol. According to the needs of your disease, please actively cooperate with the medical staff to perform the function check of heart, lung, liver, kidney and other important organs to ensure your safety and the smooth operation. In the morning of the operation day, please cooperate with the nurse to keep the gastric tube and urinary catheter ready. Post-operative instructions: Fasting water after surgery, keep the gastrointestinal decompression tube fixed and unobstructed, and do not pull it out by yourself. 5-7 days after surgery, the nurse will remove the gastric tube according to your condition. If there is no discomfort, you can have semi-liquid diet on the 2nd day, and full liquid on the 3rd day. If there is no abdominal pain and bloating after eating, you can have semi-liquid diet on the 4th day, and white rice porridge is good. Avoid raw, cold, hard and irritating foods. Pay attention to a small number of meals, 6-7 meals per day at the beginning, then gradually reduce the number of meals and increase the amount of each meal, and gradually transition to a normal diet. Early activity can promote intestinal peristalsis, prevent intestinal adhesions, promote respiration and blood circulation, and reduce postoperative complications. According to the condition, generally on the 1st postoperative day, you can move around in bed in a semi-recumbent position, and on the 2nd day, you can get out of bed and move around indoors. According to individual differences, it is better not to feel strained. Note for discharge: The cure of disease depends on long-term postoperative cooperation. Within one year after gastrectomy, stomach capacity is limited, so it is easy to eat small amount of meals, and eat a nutritious and easily digestible diet, and then slowly transition to a normal diet. Avoid raw, hard, spicy and stimulating food, overeating, smoking and alcohol. Be optimistic and keep your mood relaxed. Avoid overexertion. For those who need to take medication, please strictly follow the instructions or follow the doctor’s advice, pay attention to the time, manner, dosage and side effects of medication. Avoid taking drugs that are damaging to the gastric mucosa, such as aspirin, anti-inflammatory pain, corticosteroids, etc. Review regularly and consult for discomfort.