There is no definite conclusion on how often gastric ulcers become cancerous. The current belief is that the cancer rate of gastric ulcers is about 1%, so most patients do not become cancerous. Gastric ulcers are potentially cancerous. Gastric ulcers generally occur as a result of decreased gastric barrier function with enhanced invasive factors. Most patients with gastric ulcers are accompanied by H. pylori infection, which may lead to carcinogenesis in patients who are repeatedly untreated under the stimulation of chronic inflammation and the action of H. pylori. For most patients, if H. pylori is eradicated, active treatment of gastric ulcer and regular medication, the prognosis is good and the risk of cancer is low. It is only necessary to review the gastroscopy regularly and not to worry too much. Most patients with gastric ulcer may not develop cancer in their lifetime, but some patients, if not well controlled, will have higher risk of gastric cancer, but there is also an increasing difference in cancer time, which may be several years or decades.