Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Graves' Disease ?
    ### Response:
    Graves ophthalmopathy is a condition associated with Graves disease that occurs when cells from the immune system attack the muscles and other tissues around the eyes.
                
The result is inflammation and a buildup of tissue and fat behind the eye socket, causing the eyeballs to bulge out.
    