Gastritis is the most common disease of the stomach and is mainly caused by edema and congestion on the gastric mucosa. The main cause of the disease is edema and congestion on the gastric mucosa. Many people suffer from gastritis due to poor diet and emotions, so pay attention to the maintenance of the stomach after the disease and avoid triggering factors to have the possibility of self-healing. The patient with mild gastritis needs to eat food that is easy to digest and absorb, and reduce the intake of spicy, stimulating and cold food. If you do not take care of your stomach, there is a chance that gastritis will worsen and even develop into atrophic gastritis. Once it develops into atrophic gastritis, it is more difficult to treat and requires the choice of medication. Some people suffer from gastritis due to H. pylori infection. If H. pylori is not eradicated in time, the disease will recur, so medication is needed for eradication. For patients with H. pylori infection, they can be treated with a combination of levofloxacin, metronidazole, and omeprazole.