Chronic non-atrophic gastritis with erosion requires a biopsy of the eroded area during a gastroscopy for a pathological examination to determine the nature of the erosion, whether it is inflammatory, intestinal metaplasia, or atypical hyperplasia, etc. If the erosion is inflammatory, oral medication is needed for treatment, such as treatment against Helicobacter pylori, as well as acid suppression, stomach protection, promotion of gastric motility, and protection of the gastric mucosa. If intestinal metaplasia or moderate to severe atypical hyperplasia is present, endoscopic mucosal resection is recommended. This is because moderate to severe intestinal metaplasia or atypical hyperplasia has a certain rate of malignancy, and endoscopic mucosal resection is necessary for thorough treatment, as oral medication alone cannot completely cure this lesion.