Disabilities make it harder to take part in normal daily activities. They may limit what you can do physically or mentally, or they can affect your senses. Disability doesn't mean unable, and it isn't a sickness. Most people with disabilities can - and do - work, play, learn, and enjoy full healthy lives. Mobility aids and assistive devices can make all the difference.
About one in every five people in the United States has a disability. Some people are born with a disability. Some get sick or have an accident that results in a disability. Some people develop disabilities as they age. Almost all of us will have a disability at some point.
References and abstracts from MEDLINE/PubMed (National Library of Medicine)