Parkinson's disease is a progressive neurogenerative disease that causes nerve cells (or neurons) in the area of the brain that controls movement to weaken and/or die. While healthy neurons produce a chemical called dopamine, which the brain needs a certain amount of in order to regulate movement, weakened neurons produce lower levels of dopamine. What causes these neurons to weaken is currently unknown.

Some patients with Parkinson's disease also suffer from a decline in norepinephrine, a chemical that transmits signals across nerve endings and controls various functions, such as blood pressure and heart rate.

More than 10 million people worldwide are currently living with Parkinson's disease and nearly one million will be living with the disease in the United States this year, according to the Parkinson's Foundation.

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