How long you live with ulcerative colitis varies according to the condition and treatment effect. If the lesion is mild and the treatment is timely, it may not affect your life expectancy; if the lesion is severe, and complications such as toxic megacolon, intestinal perforation, and carcinoma occur, the survival period may be shortened, and may even be life-threatening. Ulcerative colitis is a kind of autoimmune-related inflammatory bowel disease, chronic process, there is no effective way to cure, easy to recur, not easy to be completely cured. If the ulcerative colitis is mild and long-term remission, and timely and standardized treatment, no complications occur, often a good prognosis, can have no impact on life. If the ulcerative colitis lesions are extensive, involving deeper intestinal wall, and the condition is serious, without timely treatment, toxic megacolon, intestinal perforation, cancer and other complications may occur, which will seriously affect the prognosis, and may even be life-threatening. Patients with ulcerative colitis should go to the hospital in time and be treated under the guidance of a doctor.