Although the causes of gastric cancer have not been fully identified, a lot of information shows that it is closely related to environmental factors, dietary habits, precancerous lesions and genetic factors. Here are eight preventive measures: 1. Eat less or no pickles Pickles contain a large amount of nitrite and secondary amines, which can synthesize nitrosamines under the action of suitable acidity or bacteria in the stomach, and these compounds are strong carcinogens. So the food should be fresh, and advocate refrigerator refrigeration. 2.No or less smoked and fried food Smoked fish and bacon contain a large amount of carcinogenic substances, such as 3-4 benzopyrene and cyclic aromatic hydrocarbons. Fried, baked, burnt food and reused high temperature cooking oil also contain such carcinogenic substances and should be consumed sparingly. 3, do not eat moldy food in daily life, often encounter moldy food, mold is caused by contaminated mold, some of the mold is a toxic fungus, is a very strong carcinogenic substances, while some food in the role of toxic fungi produce a large number of nitrite and secondary amines, into the body under certain conditions, the stomach can synthesize nitrosamines and carcinogenic compounds. Smoke contains many carcinogenic or carcinogenic substances such as benzo(a)pyrene, polycyclic aromatic hydrocarbons and dibenzocarbazole, which is one of the causes of esophageal cancer and gastric cancer. Although alcohol itself is not a carcinogenic substance, strong alcohol can stimulate the gastric mucosa, damage the mucosal tissue and promote the absorption of carcinogenic substances, and it is more harmful if drinking alcohol and smoking at the same time. Because alcohol can enhance the permeability of cell membranes, thus strengthening the absorption of carcinogenic substances in smoke. 5. To develop good eating habits, if the diet is not regular and quantitative, overeating, eating too fast and too hot, it is a damaging stimulus to the stomach and has a certain relationship with the occurrence of stomach cancer. At the same time, high salt intake and boredom during meals are also related to gastric cancer. 6.Eat more fresh vegetables and fruits, eat more food containing vitamin A, B and E, and strengthen protein intake appropriately to protect gastric mucosa. 7.Protect the hygiene of edible water because contaminated water sources contain many kinds of cancer-causing metal ions, so be sure to use regular tap water and try to use well water in rural areas. Atrophic gastritis is closely related to gastric cancer and is a precancerous lesion; gastric ulcer malignant gastric cancer accounts for 5-10%; gastric polyadenomatous polyps are more common than single polyps, and polyps with a diameter of more than 2cm show a tendency of malignant transformation; pernicious anemia is also related to gastric cancer. Therefore, people who suffer from atrophic gastritis, gastric ulcer, gastric polyadenomatous polyp and pernicious anemia must go to hospital frequently for examination and treatment to eliminate precancerous lesions and prevent the occurrence of gastric cancer.