Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) What I need to know about Crohn's Disease ?
    ### Response:
    Intestinal blockage can occur in people with Crohns disease when scar tissue blocks the intestinal passage. A narrow intestinal passage is called a stricture. When the passage blocks completely, food and stool stop moving, causing abdominal cramps and vomiting.
    