Chronic atrophic gastritis type C3 indicates that the degree of atrophy is more serious, suggesting that the mucosal atrophy has reached the upper curvature side of the gastric body, and the possibility of carcinoma is increased. Chronic atrophic gastritis can be divided into C0-3, O1-3 six types. Among them, C0-1 indicates that mucosal atrophy is mainly dominated by the gastric sinus or gastric angle; C2 indicates that mucosal atrophy reaches the lesser curvature of the lower part of the stomach; C3 indicates that mucosal atrophy has reached the lesser curvature of the upper part of the gastric body, and the degree of atrophy is more serious, and the possibility of cancerous transformation is also increased. O1 indicates that the mucosal atrophy has exceeded the anterior and posterior walls from the cardia to the gastric body; O2 indicates that the mucosal atrophy is between O1 and O3; O3 indicates that only the greater curvature of the gastric body has normal mucosa, while the rest of the gastric body has atrophy. If the patient is diagnosed with chronic atrophic gastritis type C3, it is recommended to go to the regular hospital in time, after clarifying the cause of the disease, under the guidance of the doctor to carry out targeted treatment, in order to reduce the adverse effects of the disease.