Was told i had ulcerative colitis 18 months ago, had another colonoscopy today and he now says crohn's colitis? what is the difference, thank you

Different diseases: These 2 conditions can be difficult to tell the difference between and pathology review of a biopsy is often needed. Ulcerative colitis only affects the internal lining of the colon. Crohn's disease can affect any part of the intestinal tract from stomach to small bowel ; colon, and affects the full thickness of the bowel wall. Different medical treatments, different risk factors.