Ileitus is the inflammation of the final section of the small intestine accompanied by abdominal pain. It may be due to irritation of the lining, bacterial infection, or the absorption process of the small intestine being comprised in some way. These diseases can be chronic and can also be caused by colitis. Treatments can include steroid medication to reduce inflammation, low fiber diet, pain medication, antibiotics.
[Disclaimer: this answer is not a professional medical advice.]
If you mean non-specific ilieitis, then you are pertaining to the inflammation of the ileum, which is the part of the small intestine closest to the colon or large intestine.
There are several recommendable treatment procedures for this, including bed rest and a low-fiber diet, which would lessen the pressure on the ileum. (For samples of low-fiber meals for a whole day, check out the source provided below.) Certain vitamin supplements also help.
There are also certain medications, including corticosteroids for the inflammation, antibiotics for any pathogen, and analgesics for the pain. For extreme cases patients opt for their ileum to be removed--an operation called ileostomy.
However, it would be best if you seek professional medical advice, because cases differ per individual, and a doctor must assess the particular case in order to recommend a treatment procedure appropriate for the particular condition of the patient.