Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Benign hereditary chorea ?
    ### Response:
    Benign hereditary chorea (BHC) is a rare movement disorder that begins in infancy or childhood. Signs and symptoms in infants may include low muscle tone, involuntary movements (chorea), lung infections, and respiratory distress. Signs and symptoms in children may include delayed motor and walking milestones, jerky muscle movements (myoclonus), upper limb dystonia, motor tics, and vocal tics.
    