Stomach cancer has a high incidence in China, which groups are more likely to suffer from stomach cancer? Precancerous lesions: Precancerous lesions refer to benign diseases with cancer tendency, such as: (1) chronic atrophic gastritis, the cancer rate can reach 10%; (2) chronic gastric ulcer, the cancer rate is less than 3%; (3) gastric polyps, with diameter >2cm, multiple and wide base, the cancer rate is high; (4) partial gastrectomy, the cancer rate of residual stomach can reach 0.3%-10%. 2, poor dietary habits: such as irregular diet, fast eating, high salt/hot food, pickled, smoked, dried seafood, overnight vegetables with high content of carcinogenic substances nitrite, red meat with barbecue, frequent consumption of moldy food, less fresh vegetables, etc. 3.Long-term alcoholism and smoking: alcohol can change the mucous membrane cells and cause cancer. Smoking is also a strong risk factor for gastric cancer, and those who start smoking in adolescence are at the greatest risk. 4.Family history of gastric cancer or esophageal cancer: the incidence of gastric cancer among patients’ family members is 2~3 times higher than normal population. 5.Long-term poor psychological status: such as depression, sadness, pining, loneliness, depression, hatred, disgust, low self-esteem, self-blame, guilt, interpersonal tension, mental breakdown, sulking, etc., the risk of stomach cancer is significantly higher. 6.Some special occupations: long-term exposure to sulfuric acid dust and mist, lead, asbestos, herbicides and metal industry workers have significantly higher risk of stomach cancer. 7.Geology and water quality containing harmful substances: areas with volcanic rocks, high peat and deep and large faults have small Ca/SO4 ratio in water and high content of nickel, selenium and cobalt. Volcanic rocks contain high levels of 3,4 benzo(a)pyrene, and peat has high levels of organic nitrogen and other nitrosamine precursors, which can easily damage the gastric mucosa. Selenium and cobalt can also cause gastric damage, and nickel can promote the carcinogenic effect of 3,4 benzo(a)pyrene. 8, Helicobacter pylori (Hp) infection: some studies say that about half of gastric cancer is related to H. pylori infection. About 60% of our country is infected with the bacteria, but only 0.03% of the population suffer from gastric cancer.