Ileitis is an inflammation of the ileum, which is the last part of the small intestine. This condition can cause symptoms like abdominal pain, diarrhea, and weight loss. It often occurs in people with Crohn's disease, a type of inflammatory bowel disease, but can also result from infections or other factors. Treatment for ileitis typically involves medications to reduce inflammation and manage symptoms. In some cases, dietary changes may help alleviate discomfort. If the condition is severe or doesn't respond to treatment, surgery might be necessary to remove the affected portion of the ileum.