Parkinson's disease is one of the most common nervous system disorders. This disease is part of a group of conditions called motor system disorders. Motor system disorders are the result of the loss of brain cells that produce dopamine. Dopamine is a neurotransmitter. It acts as a chemical messenger in transmitting signals in the brain and other areas of the vial. Dopamine is found in humans and animals, including both vertebrates and invertebrates. More information about dopamine can be found by visiting http://www.news-medical.net/health/What-is-Dopamine.aspx. There are four main symptoms of Parkinson's disease, which include (1) tremors or tremors in the hands, arms, legs, jaw, and face, (2) stiffness or rigidity of the limbs and trunk, (3) bradykinesia or slowness of movement and (4) postural instability or impaired balance and coordination. Parkinson's disease is considered chronic and progressive, meaning that it is constant and does not go away and will only increase in intensity and severity of symptoms as the disease continues. Most cases of Parkinson's disease result from a combination of genetic and environmental factors, many of which have not been identified. The National Institute of Neurological Disorders and Stroke (NINDS) has published several informational documents on Parkinson's disease that can be found at http://www.ninds.nih.gov/disorders/parkinsons_disease/parkinsons_disease.htm. More than a dozen genes have been identified to influence the risk of developing the disease if they are altered. Genes in the Parkinson's disease gene family have a variety of functions in the brain, as well as active ones in other organs and tissues. .... middle of paper ......heavy work, work in the medical industry and other areas that require constant and stable manual control. The Michael J. Fox Foundation website allows people to post comments, and I was touched by the strength Jo Dee Biddle, who cares for a Parkinson's patient, wrote, “If I've learned anything about Parkinson's disease in 28 years, it's about taking things one day at a time. If it's not, don't be sorry." I think this is a really inspiring way to look at everyday life with Parkinson's. This attitude and approach will make the happy days with this disease even more large ones and the more difficult ones easier to deal with. There is much that is not known about this disease, but there are many foundations and research efforts that support promoting the cause of research and the continued pursuit of early diagnosis..