Parkinson’s disease is a disorder that affects nerve cells, or neurons, in a part of the brain that controls muscle movement. In Parkinson’s, neurons that make a chemical called dopamine die or do not work properly. Dopamine normally sends signals that help coordinate your movements. No one knows what damages these cells. Symptoms of Parkinson’s disease may include

• Trembling of hands, arms, legs, jaw and face
• Stiffness of the arms, legs and trunk
• Slowness of movement
• Poor balance and coordination

As symptoms get worse, people with the disease may have trouble walking, talking or doing simple tasks. They may also have problems such as depression, sleep problems or trouble chewing, swallowing or speaking.

Parkinson’s usually begins around age 60, but it can start earlier. It is more common in men than in women. There is no cure for Parkinson’s disease. A variety of medicines sometimes help symptoms dramatically.(1)

Causes

Most people with Parkinson’s disease are described as having idiopathic Parkinson’s disease (having no specific cause). There are far less common causes of Parkinson’s disease including genetic, toxins, head trauma, cerebral anoxia, and drug-induced Parkinson’s disease. (2)

Source: (1) http://www.nlm.nih.gov/medlineplus/parkinsonsdisease.html
(2) http://en.wikipedia.org/wiki/Parkinson%27s_Disease

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