Cerebral palsy is the term that covers a wide range of physical disabilities caused by damage to the brain during development. The impairment can range from severe to mild. Movement and posture are impaired, and other conditions such as intellectual impairment, epilepsy, blindness, or deafness may also exist, depending on which area of the brain has been affected and the extent of the damage. Most people with cerebral palsy are not intellectually disabled, and most cerebral palsy individuals with physical impairments usually have a normal range of intelligence. It is believed that 85% to 95% of individuals with cerebral palsy also have speech impairments. Palsy is a synonym for paralysis, but in this case has come to describe weakness and inability to make many voluntary movements and suppress involuntary ones. The form of cerebral palsy may change form from year to year, especially during the early years of growth.