Parkinson’s disease affects its sufferer’s nervous system; it is a degenerative disorder that impairs sufferer’s motor skills, speech and other functions. Parkinson’s is both a progressive and chronic disease.
There is no proven singular reason for why Parkinson’s disease affects its victims, and there are currently no cures for the disease; however modern medicine or surgery can help to offer some relief form its symptoms and slow its progression. If you have a friend or family member who has been diagnosed with this illness or you would simply like to learn more, then there is a web site that you might consider taking a look at. www.pdf.org is the home of the Parkinson’s Disease Foundation, and form within the pages of this site you can learn more about the disease, get useful information and support and learn about the work of the organization. The site also contains a useful section where you can ask an expert any question related to PD. 
