Gastroenterology and hepatology > Ulcerative colitis – severity

  • Ulcerative colitis affects the large intestine – colon and rectum (back passage) only; never the small intestine.
  • The extent of involvement of the large intestine can vary.
  • The pattern of disease activity can also vary.
  • Some people may have a severe initial presentation followed by a single mild relapse, or mild recurring relapses over time. Others may have severe persistent disease.
  • Strict adherence to medications reduces the risk of relapse.