Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Irritable Bowel Syndrome ?
    ### Response:
    Irritable bowel syndrome (IBS) is a problem that affects the large intestine. It can cause abdominal cramping, bloating, and a change in bowel habits. Some people with the disorder have constipation. Some have diarrhea. Others go back and forth between the two.
    