Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Monoclonal gammopathy of undetermined significance ?
    ### Response:
    Monoclonal gammopathy of undetermined significance (MGUS) is a condition in which an abnormal protein called monoclonal protein is detected in the blood. MGUS typically does not cause any problems, although some affected people may experience numbness, tingling or weakness.
    