Ileitis is an inflammation of the

ileum The ileum () is the final section of the small intestine in most higher vertebrates, including mammals, reptiles, and birds. In fish, the divisions of the small intestine are not as clear and the terms posterior intestine or distal intestine m ...

, a portion of the

small intestine The small intestine or small bowel is an organ (anatomy), organ in the human gastrointestinal tract, gastrointestinal tract where most of the #Absorption, absorption of nutrients from food takes place. It lies between the stomach and large intes ...

. Crohn's ileitis is a type of

Crohn's disease Crohn's disease is a type of inflammatory bowel disease (IBD) that may affect any segment of the gastrointestinal tract. Symptoms often include abdominal pain, diarrhea (which may be bloody if inflammation is severe), fever, abdominal distensi ...

affecting the ileum. Ileitis is caused by the bacterium '' Lawsonia intracellularis''. Inflammatory bowel disease does not associate with ''Lawsonia intracellularis'' infection.

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Inflammations Noninfective enteritis and colitis {{disease-stub