Long-term gastritis may lead to stomach cancer, but it is not absolute, and it should be noted that long-term gastritis will increase the chance of cancer when it evolves into atrophic gastritis and gastric ulcer. 1. Ordinary gastritis: ordinary gastritis and chronic non-atrophic gastritis, as long as they are controlled in time, generally have good prognosis and will not evolve into gastric cancer. 2. Atrophic gastritis: Helicobacter pylori is the main cause of atrophic gastritis, but bile reflux, long-term use of non-steroidal anti-inflammatory drugs, alcohol consumption, autoimmune mechanism and heredity can all lead to the disease. If there is atrophic gastritis accompanied by intestinal epithelial hyperplasia and obvious heterogeneous hyperplasia, then the probability of cancer will be relatively increased, and close observation is needed. 3. Gastric ulcer: Gastritis triggered on the basis of Helicobacter pylori infection, if not diagnosed and treated in time, may be complicated with gastric ulcer, which has a certain risk of cancer. It is recommended that once the symptoms of stomach discomfort appear, gastroscopy should be done regularly for early detection of gastric malignant tumors.