Atrophic gastritis c1 can not be judged as whether it belongs to the category of the first level, the two belong to the CO grading as well as endoscopic grading, respectively, and should be viewed differently. 1. Atrophic gastritis CO grading according to the scope of the patient’s gastric mucosal atrophy lesions will be divided into c1, c2, c3, o1, o2, o3 six types of subtypes, of which the c represents close, known as the closed type; o on behalf of the open, known as the open type. Among them, c1 refers to the mucosal atrophy range in the gastric sinus. 2. Atrophic gastritis is graded according to endoscopic findings and is divided into three levels. Grade I mucosa becomes fine granules, blood vessels are partially visible, and single gray intestinal epithelial hyperplasia nodule. Grade II mucosa is moderately granular, with continuous and homogeneous vascularity and multiple gray mesenteric epithelialized nodules. Grade III mucosa is coarsely granular, with loss of folds, superficial vascularity, and diffuse gray mesenteric epitheliomatous nodules. There is no equivalence between the two different classifications due to their different bases. If the diagnosis of atrophic gastritis is clear, you should consult a doctor in a timely manner to clarify the grading of the condition and standardize the treatment under the guidance of a professional physician to avoid delaying the condition.