Spasticity is a syndrome of abnormally increased muscle tone following damage to the central nervous system, and is a motor dysfunction characterized by a speed-dependent hyperexcitability of the tonic detrusor reflex due to increased excitability of the detrusor reflex. Speed-dependent spasticity means that the degree of muscle spasm is increased along with the increase in the speed of muscle stretching. Spasticity can occur after any damage to the central nervous system. However, clinically spasticity is most often seen in stroke, spinal cord injury, spinal cord lesions, cerebral palsy, and multiple sclerosis. Spasticity is a pathophysiological state. Its effects on patients include the following: 1. increased resistance to movement, making it difficult to complete random movements; 2. sluggish and difficult to control movements due to increased resistance, making it difficult to complete delicate movements; 3. difficulty in coordinating movements due to unresponsiveness, making it easy to fall; 4. tonic spasticity, inconvenient to care for and prone to complications such as pressure sores; 5. affecting gait and activities of daily living.