The severity of intestinal melanosis is generally judged from the color of the intestinal wall and the condition of the mucosal blood vessels under the microscope. Enteromelanosis can be categorized into degree I, degree II and degree III according to the degree of lesions, and the differentiation method mainly relies on the results of colonoscopy observation. In Grade I melanosis, the color of the intestinal surface is light brown, and the lesion area is limited to a certain range or a certain section, and the vascular lines of the mucosa are vaguely visible, and the demarcation line between the mucosa and other normal parts of the surrounding area is not too clear. II degree intestinal melanosis intestinal dark brown, most of the lesions can be seen in the left half of the colonic mucosa, mucosal blood vessels are not very clear, and the mucosa of the lesion site and the surrounding normal tissue mucosal demarcation is clearer. In degree III intestinal melanosis, the intestinal tract is dark brown, the lesion appears in the whole colon, and the blood vessels on the mucosal surface are difficult to observe clear texture, and even the texture of the blood vessels in some positions disappears completely. If the above symptoms occur, it is recommended to go to the hospital in time for early and regular treatment.