Gastroenterology and hepatology > Crohn’s disease – what is it?

  • Crohn's disease is one of two conditions collectively known as inflammatory bowel disease (IBD). The other is ulcerative colitis.
  • It is a chronic (persistent) disease that causes inflammation of the digestive (gastrointestinal) tract.
  • Crohn's disease can affect any part of the gastrointestinal tract, both upper and lower.
  • It affects all layers of the bowel wall, from the lining to deeper layers.
  • Initially, patchy ('skip') lesions form in inflamed areas.
  • Ulcers may develop, giving the bowel a cobblestoned appearance.

    For more information on Crohn's disease, go to:
    Crohn's disease – complications and severity
    Crohn's disease – tests and treatments