Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Juvenile Huntington disease ?
    ### Response:
    Juvenile Huntington disease (HD) is a less common, early-onset form of Huntington disease that begins in childhood or adolescence. It is also a progressive disorder that causes the breakdown of brain cells in certain areas of the brain. This results in uncontrolled movements, loss of intellectual abilities, and emotional disturbances.
    