Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Cushing's Syndrome ?
    ### Response:
    Cushing's syndrome, also called hypercortisolism, is a rare endocrine disorder caused by chronic exposure of the body's tissues to excess levels of cortisol - a hormone naturally produced by the adrenal gland. Exposure to too much cortisol can occur from long-term use of synthetic glucocorticoid hormones to treat inflammatory illnesses.
    