Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Adrenal Insufficiency and Addison's Disease ?
    ### Response:
    Adrenal insufficiency is an endocrine, or hormonal, disorder that occurs when the adrenal glands do not produce enough of certain hormones. The adrenal glands are located just above the kidneys.
                
Adrenal insufficiency can be primary or secondary.
    