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 ma ...

, a portion of the

small intestine The small intestine or small bowel is an organ in the gastrointestinal tract where most of the absorption of nutrients from food takes place. It lies between the stomach and large intestine, and receives bile and pancreatic juice through the p ...

. 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 distension ...

affecting the ileum. Ileitis is caused by the bacterium ''

Lawsonia intracellularis ''Lawsonia intracellularis'' is a species of bacterium. It is obligately intracellular and was isolated from intestines of pigs with proliferative enteropathy disease. Pathogenicity ''Lawsonia (bacterium), Lawsonia intracellularis'' is highly p ...

''. Inflammatory bowel disease does not associate with ''Lawsonia intracellularis'' infection.

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Inflammations Noninfective enteritis and colitis {{disease-stub