Spasticity is a condition in which certain muscles are continuously contracted.
This contraction causes stiffness or tightness of the muscles and may interfere with gait, movement, and speech. Spasticity is usually caused by damage to the portion of the brain or spinal cord that controls voluntary movement. It may occur in association with spinal cord injury, multiple sclerosis, cerebral palsy, anoxic brain damage, brain trauma, severe head injury, some metabolic diseases such as adrenoleukodystrophy, and phenylketonuria. The degree of spasticity varies from mild muscle stiffness to severe, painful, and uncontrollable muscle spasms. The condition can interfere with rehabilitation in patients with certain disorders, and often interferes with daily activities.