The evolution of gastritis to gastric cancer takes a period of time For most patients, if the patient has chronic gastritis, that is, there is chronic inflammatory changes in the gastric mucosa, there is usually a vague pain and discomfort in the abdomen, accompanied by a feeling of fullness and distension in the abdomen, nausea, acid reflux, belching and other symptoms. After a period of time, if the chronic inflammation is not treated, it will continue to progress, for example, it will develop into chronic atrophic gastritis, and there may also be enterocytosis, which means that the cells will have intestinal epithelial-like metaplasia. After some time, there will be precancerous lesions, which may be atypical hyperplasia or high-grade intraepithelial neoplasia. If the disease continues to progress, there may be focal cancer, which may be very small in size and may be point-like. If the disease continues to progress and the tumor continues to increase in size, it may be mass-type or ulcer-type gastric cancerous lesions.