Spasticity is usually caused by central nervous system injuries, such as brain injuries or spinal cord injuries. Spasticity is a little different from stiffness.
There is insufficient research on adults living with cerebral palsy, (as referenced in my previous blog post on cerebral palsy and adulthood). Although there is a paucity of studies examining mental health in this population, medical researchers have speculated that the rate of depression is three to four times higher in people with disabilities such as CP than it is in the general population.