Parkinson's disease is a movement disorder of the nervous system that worsens over time. The nervous system is a network of nerve cells that controls many parts of the body, including movement.

Symptoms begin slowly. The first symptom may be a barely noticeable tremor in one hand, or sometimes in a foot or jaw. Tremor is common in Parkinson's disease. However, the disorder can also cause stiffness, slowness of movement, and balance problems, increasing the risk of falls.

In the early stages of Parkinson's disease, the face may show little or no expression. The arms may not swing when walking. Speech may become weak or slurred. Symptoms worsen over time.

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