Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) autoimmune Addison disease ?
    ### Response:
    Autoimmune Addison disease affects the function of the adrenal glands, which are small hormone-producing glands located on top of each kidney. It is classified as an autoimmune disorder because it results from a malfunctioning immune system that attacks the adrenal glands.
    