Spasticity is also colloquially referred to as an unusual “tightness”, stiffness, or “pull” of muscles.
It is a neuromuscular condition usually caused by damage to the portion of the brain or spinal cord that controls voluntary movement. The damage causes a change in the balance of signals between the nervous system and the muscles.
It is typically found in people with cerebral palsy, traumatic brain injury, stroke, multiple sclerosis, and spinal cord injury.
It is usually treated with anti-spasticity medications.