Chronic gastritis includes three types: chronic non-atrophic gastritis, chronic atrophic gastritis, and special types of gastritis. The severity of chronic gastritis depends on the type of gastritis and the extent of the lesion. If the chronic gastritis is chronic non-atrophic gastritis, and the gastric mucosa only shows hyperemia or edema without erosion, then it is relatively mild. With treatment, it can be cured in a short time. If chronic gastritis presents with erosion, and the nature of the erosion includes moderate to severe intestinal metaplasia or atypical hyperplasia, or if there is atrophy of the intrinsic gastric glands, then the condition is relatively severe. Treatment is relatively complicated, and there is a certain risk of cancer transformation.