Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Crohn's Disease ?
    ### Response:
    Crohn's disease is a chronic, or long lasting, disease that causes inflammationirritation or swellingin the gastrointestinal (GI) tract. Most commonly, Crohn's affects the small intestine and the beginning of the large intestine. However, the disease can affect any part of the GI tract, from the mouth to the anus.
    