Ulcerative colitis need to do colonoscopy, colonoscopy is necessary to clarify the diagnosis, understand the extent of the lesion and the judgment of the condition, and choose a treatment plan. Patients with ulcerative colitis usually need to do colonoscopy, do colonoscopy forceps abnormal intestinal tissues sent for pathological examination, can clarify the diagnosis of ulcerative colitis, and other diseases causing abdominal pain and diarrhea, such as Crohn’s disease, intestinal tuberculosis, etc., to diagnose ulcerative colitis. Colonoscopy allows visualization of the lesions and is therefore helpful in clarifying the extent of the disease as well as determining the condition. Combining the results of the colonoscopy helps the doctor to develop a more appropriate treatment plan. If ulcerative colitis patients need to do colonoscopy must go to a regular hospital to carry out, follow the doctor’s instructions, so as to avoid adverse consequences.