Gastric cancer is one of the common malignant tumors in China. By tracing the lifestyles of patients suffering from gastric cancer, the occurrence of gastric cancer is mainly related to dietary habits, what are other risk factors besides? Japanese scholars have studied the risk factors of gastric cancer in East Asia, such as high salt, smoked foods, foods with high nitrite content, which induce intestinal chemistry of stomach and eventually lead to cancer. Smoked food, pickled food and barbecued food are common delicacies on the table of East Asians. These foods either contain high amount of nitrite or certain amount of carcinogens, such as -acrylamide, benzo(a)pyrene, etc., which may not be harmful to proper intake, but long-term partial eating will indeed cause harm to the stomach. 2, H. pylori infection H. pylori for short HP, the World Health Organization report shows that about 50% of gastric cancer is related to H. pylori, H. pylori is the main pathogenic bacteria of the upper gastrointestinal tract diseases, can cause gastric ulcers and gastric cancer. About 60% of the population in China is infected with H. pylori. HP infection is closely related to eating habits, easy to detect and easy to treat. Atrophic gastritis is a chronic digestive disease characterized by atrophy of the epithelium and glands of the gastric mucosa, thinning of the gastric mucosa, thickening of the mucosal base, or with pyloric glandular hyperplasia and intestinal glandular hyperplasia, or atypical hyperplasia. This disease is classified as precancerous lesion of gastric cancer and one of the risk factors of gastric cancer. History of gastrectomy The history of gastrectomy, especially the history of major gastrectomy, is one of the high-risk factors for the occurrence of gastric cancer, the reason of which is still unclear, but it is necessary to be vigilant about 15-20 years after the surgery of gastric cancer. 5.Smoking Long-term smoking as a risk factor for gastric cancer alone can increase the risk of occurrence of gastric cancer by 1.5 times. The more risk factors a person has, the higher the possibility of gastric cancer. In addition, the more high-risk people, such as patients with atrophic gastritis and gastrectomy, should pay more attention to changing their lifestyles to prevent the occurrence of gastric cancer.