Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Swallowing Disorders ?
    ### Response:
    If you have a swallowing disorder, you may have difficulty or pain when swallowing. Some people cannot swallow at all. Others may have trouble swallowing liquids, foods, or saliva. This makes it hard to eat. Often, it can be difficult to take in enough calories and fluids to nourish your body.
    