Ulcerative colitis, or ulcerative nodes for short, is an immune abnormality that occurs in the body under a variety of adverse circumstances, resulting in damage to the colonic mucosa due to abnormal immunity. Its essence is an immune disorder, and its manifestation is damage to the intestinal mucosa. In addition to the manifestations of colitis, patients with ulcerative colitis often have damage to several organ tissues such as the skin, eyes, bones and joints, and liver. It can be said that the history of ulcerative colitis is the intestinal manifestation of a systemic immune disorder. The treatment of ulcerative colitis requires a very high value of the doctor’s experience. An experienced doctor can choose different drugs, different dosage forms, different combinations, and phased treatment according to the patient’s time of onset, degree of onset, and extent of onset, thus rapidly inducing acute symptom relief and sustaining remission.