Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Spasticity ?
    ### Response:
    Spasticity is a condition in which there is an abnormal increase in muscle tone or stiffness of muscle, which might interfere with movement, speech, or be associated with discomfort or pain. Spasticity is usually caused by damage to nerve pathways within the brain or spinal cord that control muscle movement.
    