Patients with gastritis and gastric ulcers may develop gastric cancer after years of recurrent disease, although the cancer rate is relatively low. A small percentage of gastric ulcers may become cancerous, mainly at the edge of the ulcer. It is mainly for huge gastric ulcers, and also for patients with long term persistent gastric ulcers. If gastritis exists with gastric mucosal atrophy, it may also evolve into gastric cancer. In the case of chronic superficial gastritis, gastric cancer almost never occurs. When there is gastric mucosal atrophy, it may further develop into atypical hyperplasia, at which time there is a risk of gastric cancer. Patients with gastritis or gastric ulcers, especially those who currently have gastric ulcers, need to cooperate with a specialist to give regular anti-ulcer treatment. If atrophic gastritis is present, aggressive treatment is also needed.