Marcel Ray Duriez 2018 all rights received. This book is an informative, reference book in understanding a disease, and is meat to be used to define terms, and to be use lightly in quotations. The information with in this book is not owned by one man or another, it is knowledge, of having an understanding in a subject- of up to date times. About Parkinson's disease (PD) is a long-term degenerative disorder of the central nervous system that mainly affects the motor system. The symptoms generally come on slowly over time. Early in the disease, the most obvious are shaking, rigidity, slowness of movement, and difficulty with walking. Thinking and behavioral problems may also occur. Dementia becomes common in the advanced stages of the disease. Depression and anxiety are also common occurring in more than a third of people with PD. Other symptoms include sensory, sleep, and emotional problems. The main motor symptoms are collectively called "parkinsonism," or a "parkinsonian syndrome." Parkinson's disease- "A disorder of the central nervous system that affects movement, often as well as having tremors." Nerve cell damage in the brain causes dopamine levels to drop, leading to the symptoms of Parkinson's. Parkinson's often starts with a tremor in one hand. Other symptoms are slow movement, stiffness, and loss of balance. Medications can help control the symptoms of Parkinson's. studies For more get the book.