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Parkinson's disease is a neurodegenerative disease that affects the areas of the brain controlling movement. Dopamine is a chemical that helps transmit messages between nerve cells in the brain. For reasons that are still unclear, dopamine-producing nerve cells gradually deteriorate and are lost, resulting in low levels of this essential transmitter. In a person with Parkinson’s, the shortage of dopamine leads to disturbances and lack of control of their movements. Problems with movement are therefore typically among the main symptoms of Parkinson's disease.