Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Cushing's syndrome ?
    ### Response:
    Cushing's syndrome is an endocrine disorder caused by prolonged exposure of the body's tissues to high levels of cortisol (a hormone produced by the adrenal gland). It most commonly affects adults between age 20 and 50 years. Signs and symptoms of Cushing's syndrome include upper body obesity, fatigue, muscle weakness, high blood pressure, backache, high blood sugar, easy bruising and bluish-red stretch marks on the skin.
    