Parkinson Disease. By: Ashley & Kendra. What is it?. Parkinson Disease (PD) is a progressive disorder of the central nervous system that often impairs the sufferer\'s motor skills, speech, and other functions. Causes. The cause of Parkinson Disease remains unknown.
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1. How many people are affected by Parkinson Disease in the United States?
2. About how old is a person who develops Parkinson Disease?
3. Give an example of a primary symptom for Parkinson Disease?