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MedicineNet: Crohns Disease
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http://www.medicinenet.com/crohns_disease/article.htm
Crohn's disease is a chronic inflammatory disease of the intestines. It primarily causes ulcerations (breaks in the lining) of the small and large intestines, but can affect the digestive system anywhere from the mouth to the anus. It also is called granulomatous enteritis or colitis, regional enteritis, ileitis, or terminal ileitis.