Stomach cancer is a relatively common malignant tumor in China. Although the specific causes of gastric cancer occurrence are not clear yet. However, research shows that the risk factors for the occurrence of gastric cancer are as follows: 1. Infection of Helicobacter pylori in the stomach. The infection rate of H. pylori in high incidence areas of gastric cancer is significantly higher than that in low incidence areas. 2. Chronic gastric diseases: such as chronic gastritis, gastric polyps, intestinal epithelial hyperplasia or atypical hyperplasia of gastric mucosa, etc.. These lesions may be transformed into cancer after a long time. 3, dietary factors: long-term eating of smoked and pickled foods, lack of fresh vegetables and fruits, etc. have a higher chance of stomach cancer. 4.Smoking: smokers have higher risk of stomach cancer than non-smokers. 5.Hereditary factors: Those whose parents or siblings have stomach cancer have a higher chance of developing stomach cancer. Therefore, it is recommended that people with the above risk factors should pay attention to their diet, eat more fruits and vegetables and less smoked and pickled foods; they should review gastroscopy regularly for early prevention and treatment.