Gastric cancer is a malignant tumor of gastric epithelial origin, the incidence rate of which is about 17.6/100,000 worldwide, accounting for the first place of gastrointestinal malignancies in China and the third place among systemic cancers. The incidence rate of gastric cancer is about 17.6/100,000 in the world, which is the first place of gastrointestinal malignant tumor in China and the third place of systemic cancer. According to the statistics of World Health Organization in 2000, 42% of gastric cancer patients are in China, and the reasons may be related to dietary habits, living environment, Helicobacter pylori (HP) infection and other factors. People with high risk of gastric cancer include: 1. 2 to 3 times of risk of gastric cancer due to H. pylori infection; 2. people with precancerous lesions (chronic atrophic gastritis, gastric ulcer, gastric polyp, partial gastrectomy); 3. people with poor dietary habits (irregular meals, food that is too hot and spicy, pickled and smoked, high salt diet, less fresh vegetables, etc.); 4. people with long-term alcoholism and smoking; 5. People who have stomach cancer or digestive system tumor family; 6.Some special occupations (those who are engaged in coal mining, tin mining, wood processing, metal making, rubber processing, chemical fertilizer and pesticide, etc.); 7.Living in areas with geological and water quality containing harmful substances (such as volcanic rocks, high peat, areas with deep and large faults). The prevention of stomach cancer mainly lies in diet 1. avoid eating rough food 2. eat less or no salt-filled food 3. eat more fresh vegetables and fruits; drink more milk 4. eat less smoked, fried and baked food 5. improve eating habits and ways: eat on time, avoid overeating; food should not be too hot, eat not too fast; eat with happy mood and cheerfulness; do not drink strong alcohol and do not smoke. 6.In addition to that, you should do regular physical examination, and if you find stomach discomfort, you should go to hospital for examination and treatment in time. Treatment principles of gastric cancer: 1.Early treatment: Early detection, early diagnosis and early treatment are the keys to improve the curative effect of gastric cancer. 2.Surgery-based comprehensive treatment: Surgery as the center, chemotherapy, radiotherapy, traditional Chinese medicine and biology are important means to improve the prognosis of gastric cancer.