The main difference between Crohn's disease and ulcerative colitis is the:

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The location of inflammatory changes within the gastrointestinal tract is the main difference between Crohn's disease and ulcerative colitis. Crohn's disease can affect any part of the digestive tract from the mouth to the anus, while ulcerative colitis only affects the colon and rectum. The severity of signs and symptoms, etiology, and type of inflammatory response can vary within each disease but are not the main distinguishing factors between them.

The Main Difference Between Crohn's Disease and Ulcerative Colitis Is