More than 500,000 Americans have cerebral palsy (CP). There are more than 4,500 new cases of CP each year. The term cerebral palsy is not a diagnosis; it is a loose descriptive term that is used to describe a group of chronic disorders—specifically, motor disorders—which impair the control of movement. These disorders usually appear in the first few years of life.

Cerebral refers to the brain’s two hemispheres, or halves that contain the higher nerve centers. Palsy refers to any condition marked by tremor or any disorder that impairs control of body movement. CP is not describing disorders in the muscles or in the nerves. The impairment stems from damage to the motor areas of the brain, which in turn cause the brain to poorly control movement of the body’s muscles.