Chronic atrophic gastritis is a digestive system disease characterized by atrophy of the intrinsic gastric glands. It is commonly seen in middle-aged and elderly people. Clinically, it mainly manifests as loss of appetite, nausea, belching, heartburn, and continuous or intermittent bloating and dull pain in the upper abdomen. A minority of patients may experience upper gastrointestinal bleeding, weight loss, anemia, and malnutrition, with incidence rates increasing significantly with age. Chronic atrophic gastritis can be divided into autoimmune gastritis and multifocal atrophic gastritis, also referred to as Type A gastritis and Type B gastritis, respectively. Gastric mucosal biopsy is a reliable method for its diagnosis.