Chronic gastritis is a chronic inflammatory lesion of gastric mucosa, which is mainly infiltrated by lymphocytes and plasma cells. The etiology is not completely clear, and the main reasons are Helicobacter pylori infection and duodenal bile reflux. This disease is a common disease, and male patients are slightly higher than female patients.

Chronic gastritis lacks specific symptoms in clinic, and the severity of symptoms is often inconsistent with the degree of mucosal lesions. Most patients often have no symptoms, and if they do, they are mostly dyspeptic symptoms, such as fullness and belching after meals. A few patients may have anorexia, nausea, epigastric pain, vomiting and even vomiting blood, emaciation and diarrhea.