Gastritis is a gastric mucosal inflammation caused by a variety of causes and is one of the most common digestive diseases. According to the clinical onset of urgency, the general can be divided into two types: acute and chronic gastritis; according to different causes can be divided into Helicobacter pylori-associated gastritis, stress gastritis, autoimmune gastritis. Gastritis caused by different causes of its pathological changes are also different, usually including three processes that epithelial injury, mucosal inflammation and epithelial regeneration. Acute gastritis according to its pathological changes can be divided into simple, erosive hemorrhagic, corrosive, purulent gastritis, chronic gastritis according to its pathological changes can be divided into non-atrophic, atrophic and special types of gastritis three categories. Various types of gastritis diagnosis and differential diagnosis mainly based on endoscopy.
