There is a certain difference between gastric erosion and gastric ulcer in the degree of tissue damage, and the depth of gastric ulcer lesions is deeper and more serious than gastric erosion. 1. Gastric ulcer: gastric erosion to a certain degree, and the depth of erosion reaches the mucous membrane muscle layer, a gastric ulcer will be formed. Excessive stomach acid, Helicobacter pylori infection, overwork, improper diet and other reasons may cause damage to the gastric mucosa, the injury continues to deteriorate may cause gastric ulcer. 2. Gastric erosion: Gastric erosion is generally characterized by small-scale damage, necrosis or inflammation of the superficial layer of the mucosa. The cause of gastric erosion is similar to gastric ulcer, and long-term use of some lipid-lowering and antihypertensive drugs may also cause gastric mucosal damage, resulting in gastric erosion. In general, gastric erosion is more superficial than gastric ulcer. Gastric erosion is in the superficial layer of the gastric mucosa, while the damage to the mucosa caused by gastric ulcers has infiltrated the muscular layer of the mucosa. However, there is no obvious difference between these two diseases in terms of etiology and mechanism. Whether it is gastric erosion or gastric ulcer, patients should pay attention to it and go to the hospital in time for diagnosis and treatment. If left unattended, it may bring more serious harm to the body.