Spasticity is usually caused by central nervous system injuries, such as brain injuries or spinal cord injuries. Spasticity is a little different from stiffness.
One of the things that was identified through research is that patients with cerebral palsy have higher rates of depression and anxiety than you would see in the general population.
Cerebral palsy is a damage to the developing brain in the motor part of the brain. Individuals with cerebral palsy have problems with weakness and sometimes also involuntary movements.