Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Degenerative Nerve Diseases ?
    ### Response:
    Degenerative nerve diseases affect many of your body's activities, such as balance, movement, talking, breathing, and heart function. Many of these diseases are genetic. Sometimes the cause is a medical condition such as alcoholism, a tumor, or a stroke. Other causes may include toxins, chemicals, and viruses.
    