The stomach is an important digestive organ. It has five major physiological functions: 1. admission and storage of food function. 2. digestion and absorption function. The mechanical and chemical digestion of food (primary digestion) is carried out through the peristalsis of the stomach and its secretion of gastric acid, the synergistic action of pepsin, etc. 3, transport and controlled emptying functions. After further processing and digestion of the food, the food becomes chyme, which is then systematically delivered to the intestine for further digestion and absorption. The cardia (entrance to the stomach) and pylorus (exit from the stomach) play a key role in this process. The gastric cardia has the role of preventing the regurgitation of gastric contents into the esophagus, and the rhythmic opening and closing control of the pylorus prevents gastric contents from entering the small intestine too quickly.4. Defense function. The mucosal barrier of the stomach, gastric acid, secretory immunoglobulin lgG, lgA and lymphoid tissue can prevent the invasion of pathogenic bacteria and foreign bodies.5, secretion function. The stomach can secrete gastric acid (hydrochloric acid), pepsin, gastrin, gastric actin, growth inhibitor, endogenous factor, etc.. Among them, the most important is the secretion of gastric acid, pepsin and endogenous factors. They are biochemicals indispensable for food digestion, and endokines play an important role in the absorption of iron. Gastrectomy is required due to complications of gastric tumors or gastric or duodenal ulcers, such as ulcer perforation, ulcer bleeding, pyloric obstruction, etc. The extent of gastrectomy and the reconstruction of the gastrointestinal tract after the resection varies according to the condition. The common ones are hemi-gastrectomy, distal gastrectomy, proximal gastrectomy and total gastrectomy. As for the gastrointestinal tract reconstruction, there are various ways depending on the condition. In conclusion, the structure, volume and physiology of the stomach have changed greatly after gastrectomy surgery, and the body needs a gradual adaptation and recovery process, which requires patient and meticulous guidance from doctors and nurses, but the key lies in the patient’s own care. So what issues should patients pay attention to when they go home after gastrectomy surgery? One, usually have a regular work and rest. Do appropriate activities, do not overexert yourself, keep your mood relaxed, do not get cold. Do not rub the abdomen when bathing, especially at the surgical incision. Second, the focus should be on diet after discharge from the hospital. After gastrectomy, patients often have symptoms such as abdominal distension, heartburn, acid reflux, intestinal tinnitus, and even palpitations, panic, cold sweat and other so-called “dumping syndrome” symptoms when they first start eating, which are related to the changes in the structure and physiological function of the stomach after gastrectomy. After gastrectomy, despite the reconstruction of the gastric digestive tract, it is still difficult to completely avoid the partial loss of stomach function. This requires patients to make corresponding changes to their dietary habits after gastric surgery. 1, eat less and more meals, gradually natural: 5~6 meals per day after discharge, try not to exceed 100 grams per meal; gradually increase the amount of food, to 6~8 months later gradually return to 3 meals per day, but the amount of food to about 150 grams per meal is appropriate, try not to exceed 200 grams; 1 year later, with the gradual growth of the residual stomach, close to the normal diet. 2, avoid eating raw and cold, chew slowly: the gastrointestinal anastomosis and other places reconstructed after gastrectomy are very delicate, so the diet should avoid raw, cold, hard, spicy and other stimulating diets, and avoid drinking strong alcohol! In the early postoperative period, the diet should be mainly nutritious liquid and semi-liquid, with easily digestible food containing high protein, high vitamin and vitamin A, B, C and other high nutrition food. Chew slowly and avoid overeating! 3, moderate amount of vegetables and fruits, rather salty than sweet: moderate consumption of vegetables, fruits and salt food, do not eat too sweet food. Because too sweet food will stimulate the secretion of gastric acid, the residual stomach is not conducive to the recent surgery. Some patients can also cause “dumping syndrome”. 4, if there is anemia, iron folic acid supplementation: because the gastrectomy removed the cells that secrete endogenous factors, which are involved in the absorption of B vitamins, and then participate in the body’s hematopoietic function. Therefore, if the patient has anemia should follow medical advice to supplement vitamin B and folic acid. It is also necessary to eat more iron-rich foods and take iron supplements as prescribed by the doctor if necessary to correct anemia. Third, pay attention to the follow-up consultation. After gastrectomy, it is easy to cause residual gastritis, recurrence of ulcer, anastomotic ulcer, etc. Therefore, if symptoms such as stomach discomfort and pain occur, it is necessary to consult the doctor in time and do gastroscopy if necessary; for patients who have undergone gastrectomy for gastric cancer, it is more important to follow up closely. After five years, the frequency of gastroscopy should be decided according to the situation.