: Parkinson's disease is a condition of the brain in which the hands and feet tremble and the affected person has difficulty in moving and walking . This rage usually occurs after the age of 50 . However, young men and women may be an exception. In this case, the rage is considered to be in his lineage. Nerve cells make a variety of chemicals , one of which is dopamine. Dapamine helps in the movement of muscles in the body. In Parkinson's disease, the dopamine-producing cells in the brain are slowly destroyed. Without dopamine, those nerve cells cannot send sensations to the muscle cells. As a result, the muscle loses its effectiveness. With age, Parkinson's causes the rage muscles to become more dysfunctional , making it difficult for rage to move , write, and so on. Parkinson's disease usually manifests itself slowly. In the early stages of anger, there is a slight tremor in the hands or feet. As a result, movement is disrupted. There are also eyelid tremors , constipation , difficulty swallowing food , difficulty walking straight , no facial expressions when speaking, i.e. tight or sore muscles with stiff mouth , difficulty moving , such as difficulty getting up from a chair or starting to walk. Such symptoms begin to appear. Regular physiotherapy on the advice of a doctor , moderate diet and living a well-balanced life can keep a person healthy.