Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Parkinson's Disease ?
    ### Response:
    Parkinson's belongs to a group of neurological conditions called movement disorders. The four main symptoms of Parkinson's disease are: - tremor, or trembling in hands, arms, legs, jaw, or head  - rigidity, or stiffness of the limbs and trunk  - bradykinesia, or slowness of movement  - postural instability, or impaired balance.
    