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Crohn’s disease can affect different sections of the digestive tract. Types of Crohn’s disease include:

  • Ileocolitis: Inflammation occurs in the small intestine and part of the large intestine, or colon. Ileocolitis is the most common type of Crohn’s disease.
  • Ileitis: Swelling and inflammation develop in the small intestine (ileum).
  • Gastroduodenal: Inflammation and irritation affect the stomach and the top of the small intestine (the duodenum).
  • Jejunoileitis: Patchy areas of inflammation develop in the upper half of the small intestine (called the jejunum).

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