It is a nervous disorder, characterized by involuntary tremors, diminishes motor power and rigidity. The mental facilities are not affected. The disease is believed to be caused by cell death in the brain area that produce dopamine. Onset of disease is usually in 50s or 60s. The disease is slowly progressive; the patient may live for many years. The disease may result from head trauma.
Effective drugs are available such as L-dopa, a natural occurring protein called glial cell-line derived neurotrophic factor which has been shown to boost uptake of dopamine, when delivered to lab rat and monkeys