Cart is empty Hand tremors and slowed movements are two of the most widely recognized hallmarks of Parkinson’s disease, and for many sufferers the first indication that something is amiss. But by the time these symptoms manifest, those patients have already lost 50–80 percent of their dopamine neurons—a mass die-off that causes the neurodegenerative disease. Malfunctions in dopamine-dependent areas of the brain are responsible for many of the symptoms, which differ from person to person in an unpredictable way.
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