Parkinson’s disease is a brain disorder that leads to shaking, stiffness, and difficulty with walking, balance, and coordination. It affects about half a million people in the United States although the numbers may be much higher. The average age of onset is 60 years, and the risk of developing Parkinson’s goes up with age. 

Parkinson’s disease was first described in 1817 by James Parkinson, a British doctor who published a paper on what he called “the shaking palsy.” In this paper, he described the major symptoms of the disease that would later bear
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