Ulcerative colitis colonoscopy features are as follows: 1. ulcerative colitis colonoscopy can see the intestinal mucosal vascular texture is obviously blurred, disordered or disappeared, the mucosa can see obvious congestion, edema, with blood attachment, some secretion attachment is also more obvious, erosion and ulcers appear, the colonic pouch can become shallow or even disappear; 2. many pseudo-polyps, mucosal bridge formation can be seen, in this In this case, it can be judged that the changes are consistent with ulcerative colitis. In general, ulcerative colitis is a continuous lesion, and microscopically sometimes some very deep, hyperplastic polyps can be seen.