Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Reye's Syndrome ?
    ### Response:
    Reye's syndrome (RS) is primarily a children's disease, although it can occur at any age. It affects all organs of the body but is most harmful to the brain and the liver--causing an acute increase of pressure within the brain and, often, massive accumulations of fat in the liver and other organs.
    