The patient with suspected colitis can be examined by the following methods to avoid deterioration of the disease: 1. Blood tests, when patients with colitis undergo blood tests, the hemoglobin decreases, and in severe cases there is a heavy decrease in hemoglobin content, and the white blood cell count increases during the onset of the disease, and the accelerated blood sedimentation is a clear sign of the active phase of this disease. 2. The patient can be examined by X-ray barium enema, which can reveal the coarse mucosa of the intestine, the hardening of the intestinal wall, and the shortening of the intestinal canal. 3. colonoscopy, which is an important means of identifying such diseases, can be performed on the whole colon or the end of the ileum to observe whether the patient’s intestine has mucosal changes.