What is IBD?

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    Last Updated: May 16, 2025

    IBD, or inflammatory bowel disease, refers to a group of gastrointestinal diseases marked by chronic inflammation that affects the intestinal lining, and Crohn’s disease, ulcerative colitis (UC), and microscopic colitis are the most common types. Crohn’s disease can affect any part of the digestive tract, whereas UC and microscopic colitis specifically target the large intestine, and UC also causes ulcer formation.

    IBD is a term used to describe multiple gastrointestinal diseases characterized by chronic inflammation that damages different parts of the intestinal lining. Crohn’s disease, ulcerative colitis (UC), and microscopic colitis are the most common types of IBD.

    Crohn’s disease can cause inflammation anywhere along the digestive tract (from mouth to anus), but usually involves the small intestine and the first part of the large intestine. Microscopic colitis and UC cause inflammation solely in the large intestine. UC also leads to the formation of ulcers (small sores) in the large intestine.[1] [2] [3] [4]

    What is IBD? - Examine