Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) What I need to know about Crohn's Disease ?
    ### Response:
    Crohn's disease is a disease that causes inflammation,* or swelling, and irritation of any part of the digestive tractalso called the gastrointestinal (GI) tract. The part most commonly affected is the end part of the small intestine, called the ileum.
                

    