It is usually believed that chronic atrophic gastritis o grade is more severe than c grade, so o1 is more severe than c3. Patients with chronic atrophic gastritis usually suffer from bloating, abdominal pain, loss of appetite, acid reflux and heartburn. The severity of chronic atrophic gastritis can be divided into six grades, which are c1, c2, c3, o1, o2, o3. c3 refers to the gastric mucosal atrophy beyond the gastric angle, to the side of the curvature of the gastric body, and continues to develop towards the cardia. o1 refers to the gastric mucosal atrophy beyond the cardia, inflammation has not involved the gastric body and fundus, belonging to the moderate degree of atrophic gastritis. o1 is a little more serious than c3. If diagnosed as chronic atrophic gastritis, early standardized treatment is recommended to reduce the adverse effects of the disease.