The main clinical manifestations are abdominal pain, bloating, acid reflux, belching and other indigestive manifestations of the upper gastrointestinal tract, which are not considered to be particularly related to Helicobacter pylori. Gastric cancer is a malignant tumor originating from the epithelium of the gastric mucosa, and currently has a fairly high incidence among digestive system tumors, mostly related to long-term consumption of smoked and pickled foods, and also mainly related to genetic factors. Helicobacter pylori is clearly a primary cause of gastric cancer. Stomach diseases such as gastric polyp, atrophic gastritis or intestinal hyperplasia and remnant stomach or atypical hyperplasia have a certain chance to transform into gastric cancer. Erosive gastritis is not a direct causative factor of gastric cancer, but it is very common in clinical practice. Both of them need to be treated by controlling diet, avoiding spicy and oily food, and eating more fresh and high-protein food.