Gastritis should be treated with medication based on a clear understanding of the cause of the disease. Therapeutic drugs involved are antibiotics, bismuth, proton pump inhibitors, vitamins and so on. There are many causes of gastritis, such as Helicobacter pylori-associated gastritis, duodenal-gastric reflux, gastric mucosal trophic factor deficiency, eosinophilic gastritis, etc., which can be treated with medication according to the specific cause. In case of H. pylori infection, a quadruple therapy containing bismuth is currently advocated, i.e., a proton pump inhibitor (e.g., omeprazole, lansoprazole, etc.) + 2 antibiotics (e.g., clarithromycin, amoxicillin, etc.) + 1 bismuth (e.g., bismuth potassium citrate, bismuth pectin, etc.). In case of gastritis caused by duodeno-gastric reflux, drugs to protect gastric mucosa and improve gastrointestinal dynamics such as magnesium aluminum carbonate, domperidone, mosapride tablets, etc. can be used. Gastritis caused by gastric mucosal trophic factor deficiency can be supplemented with vitamin B12 and so on. Eosinophilic gastritis can be relieved with glucocorticoids such as prednisone. Patients who have gastritis, please go to the hospital in time, clarify the cause of the disease, and standardize the use of drugs under the guidance of the doctor.