Gastritis is mostly caused by Helicobacter pylori infection, or factors such as improper diet, medications, and emotional stress, which lead to gastric mucosal damage. In terms of treatment, it is best to first conduct a gastroscopy and test for Helicobacter pylori to determine the type of gastritis and whether there is an infection. Treatment should then be guided by the results. If it is not possible to conduct these tests, one can use proton pump inhibitors to suppress stomach acid, in combination with gastric mucosal protectants. If reflux gastritis is present, prokinetic drugs should also be used to inhibit reflux. (Use of medications should be under the guidance of a doctor.)