Gastritis is an inflammatory response to various irritants that damage the gastric mucosa. Gastritis is the most common digestive disease and can be categorized into acute gastritis, chronic gastritis and other special types of gastritis. Acute gastritis can be characterized by epigastric pain, nausea, vomiting, and even vomiting blood, black stools and other symptoms; some patients with chronic gastritis may have no obvious symptoms, while some may have epigastric pain, loss of appetite, fullness after meals, nausea and other symptoms. Patients with gastritis can use gastric acid inhibitors such as omeprazole and gastric mucosal protectants such as aluminum thioglycollate under the guidance of a doctor, and patients with acute gastritis accompanied by markedly active bleeding can be treated with hemostasis under gastroscopy. Patients diagnosed with gastritis should actively cooperate with the doctor’s treatment.