Parkinson’s disease (PD) is a progressive neurological disorder in which the level of dopamine, an important hormone and neurotransmitter used by our brains to coordinate movement, gradually declines over time. It can cause tremors (a signature symptom), loss of balance, cramped handwriting, sleep disorders, and altered speech patterns. An estimated 10 million people have Parkinson’s disease worldwide, and approximately 90,000 new cases are diagnosed in the United States each year.
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