Gastric ulcers can become cancerous, while the vast majority of gastric polyps do not become cancerous. If gastric ulcers are not treated in time and are accompanied by H. pylori infection, they may become cancerous in the long run, but the chance of cancer is not more than 1%. Most of the gastric polyps are inflammatory polyps or adenomatous polyps, which basically do not become cancerous. However, gastric polyps may cause uncomfortable symptoms such as bloating, belching, burping, etc. Therefore, when gastric polyps are found, electrocoagulation and electrosurgery under gastroscopy is needed as soon as possible. To determine whether a gastric ulcer is cancerous or not, it is mainly determined by taking the tissue of the ulcer surface for biopsy. If cancer cells and heavily heterogeneous cells are found in the tissue of ulcer surface, it is considered as gastric cancer, and in this case, surgery is needed as soon as possible.