Chronic atrophic gastritis 0-1, or chronic atrophic gastritis type O1, refers to the limit of gastric mucosal atrophy just past the cardia. Chronic atrophic gastritis is graded endoscopically into closed and open atrophy. Closed atrophy is Close, represented by C, and is categorized as C1, C2, and C3 according to severity, while open atrophy is Open, represented by O, and is categorized as O1, O2, and O3. Chronic atrophic gastritis O1 refers to the gastric mucosal atrophy is not only limited to the gastric sinus, but also along the small curvature of the gastric sinus upward, just beyond the cardia, to the anterior and posterior wall of the gastric body, and C3 belongs to the same chronic atrophic gastritis moderate. The main manifestations are abdominal pain, loss of appetite, feeling of fullness, heartburn, acid reflux, belching, and nausea. For patients with severe conditions, there may be lethargy, insomnia and forgetfulness, accompanied by emotional tension, anxiety, depression and other symptoms. Chronic atrophic gastritis type O1 should seek timely medical treatment and standardized diagnosis and treatment under the guidance of professional doctors to avoid progression of the disease.