Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) early-onset primary dystonia ?
    ### Response:
    Early-onset primary dystonia is a condition characterized by progressive problems with movement, typically beginning in childhood. Dystonia is a movement disorder that involves involuntary tensing of the muscles (muscle contractions), twisting of specific body parts such as an arm or a leg, rhythmic shaking (tremors), and other uncontrolled movements.
    