Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Restless Legs Syndrome ?
    ### Response:
    The four key signs of restless legs syndrome (RLS) are:
                
A strong urge to move your legs. This urge often, but not always, occurs with unpleasant feelings in your legs. When the disorder is severe, you also may have the urge to move your arms.
    