Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Cushing's Syndrome ?
    ### Response:
    Cushing's syndrome occurs when the body's tissues are exposed to high levels of cortisol for too long. Many people develop Cushing's syndrome because they take glucocorticoids-steroid hormones that are chemically similar to naturally produced cortisolsuch as prednisone for asthma, rheumatoid arthritis, lupus, and other inflammatory diseases.
    