Who’s who in Crohn’s disease? A medical fieldwork guide June 6, 2019 Crohn’s disease is a lifelong condition in which parts of the digestive system become inflamed. The areas of inflammation are often patchy with sections of normal gut in between, and these inflammation patches may be small or extend quite a distance along part of the gut. Crohn’s disease can affect any part of the digestive system, from the mouth to the anus, but it’s most likely to affect the end of the small intestine. As well as affecting the lining of the bowel, Crohn’s may also go deeper into the bowel wall. Back to blogs written by GKA