Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Myotonic dystrophy ?
    ### Response:
    What are the signs and symptoms of Myotonic dystrophy? Signs and symptoms of myotonic dystrophy often begin in a person's 20s or 30s, but they can begin at any age. Symptoms often include progressive muscle weakness and wasting (particularly in the legs, hands, neck and face); stiffness and tightness of the muscles; cataracts; and cardiac conduction defects (irregular electrical control of the heartbeat).
    