Gastric mucosal atrophy is mainly considered in atrophic gastritis, mild gastric ulcer, gastric cancer and other diseases. 1. Atrophic gastritis: when patients have atrophic gastritis, gastric acid secretion is excessive, and gastric acid stimulates gastric mucosa for a long time, leading to damage of gastric mucosa, gastric mucosal erosion and bleeding, leading to unclear gastric texture and atrophy of gastric mucosa. 2. Mild gastric ulcer: when gastritis further develops into gastric ulcer, it leads to more serious gastric mucous membrane breakage, on the basis of gastric mucous membrane atrophy, accompanied by obvious breakage, redness, swelling and pain. 3. Gastric cancer: In addition to thickening of gastric wall, gastric cancer will also lead to atrophy of gastric mucosa at the place of thickening, ulceration, bleeding, erosion, etc. In addition, gastric mucosa will be atrophied, bleeding, erosion and so on. In addition, there may be other reasons for gastric mucous membrane atrophy, so it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment under the guidance of the doctor.