Parkinson's disease PD , or simply Parkinson's ,  is a long-term degenerative disorder of the central nervous system that mainly affects the motor system. The symptoms usually emerge slowly and, as the disease worsens, non-motor symptoms become more common. Those with Parkinson's can also have problems with their sleep and sensory systems. The cause of PD is unknown , with both inherited and environmental factors being believed to play a role. Tobacco smokers and coffee and tea drinkers are at a reduced risk.
Huntington's Disease: Reproductive Decision-Making
Case study: Huntington’s disease
Huntington's disease: Woman who inherited gene sues NHS
Clearly, this is a condition that can drastically affect someone from going about even normal, everyday activities. Sadly, people with HD usually experience drastic personality changes, loss of memory and impaired motor skills over the course of 10—25 years, which makes it hard to live a normal, functioning life. Despite the option to perform testing to find out if someone has inherited the HD gene, according to survey results published by Harvard University and the MassGeneral Institute for Neurodegenerative Disease:.