About half a million Americans are diagnosed with Parkinson's disease every
year. Parkinson's is a chronic neurological disorder with symptoms most commonly
present in people ages 50 and older, though recent trends have shown an increase
in the number of people ages 40 and younger who have developed the disease.
Public awareness of and interest in Parkinson's disease have never been greater
due to the number of public figures such as Muhammad Ali, Michael J. Fox, and
Janet Reno who are living with the disease. It is also at the center of the
controversy surrounding stem cell research. The A to Z of Parkinson's Disease