Parkinson's Disease (PD) Parkinson's disease is the most common form of parkinsonism, a group of motor system disorders. PD is slowly progressing and degenerative. Parkinson's Disease and Dementia Parkinson's disease is a movement disorder that can cause your muscles to tighten and become rigid, making it difficult to walk and engage in daily activities. It can also also cause memory loss and dementia in some cases. Living with Parkinson’s Disease You have a number of tools at your disposal for better managing the symptoms of Parkinson’s disease and living a healthy, enjoyable life. Ataxia Ataxia is a symptom—not a disorder. It refers to a failure of muscle control in the arms and legs, resulting in a lack of balance, coordination, and possibly a disturbance in gait. Dystonia Dystonia is a disorder that affects the way the body moves. It causes the muscles to contract, which makes them move involuntarily or get stuck in an abnormal position. Essential Tremor Disorder Essential tremor disorder is a nerve disorder. It is also called a trembling disorder. It causes a person’s hands, head, trunk, voice, or legs to shake rhythmically. Huntington’s Disease Huntington’s disease is a brain disorder in which brain cells, or neurons, in certain areas of the brain start to break down. As the neurons degenerate, the disease can lead to emotional disturbances, loss of intellectual abilities, and uncontrolled movements. Progressive Supranuclear Palsy Progressive supranuclear palsy (PSP) is a complex condition that affects the brain. Tourette's Disorder A person with Tourette's disorder develops multiple repeated tics. The tics are abrupt, purposeless, and involuntary vocal sounds or muscular jerks.