Parkinson's Disease Neurodegenerative Motor Disorder Paralysis Agitans Parkinsonian Syndrome Parkinson's disease is a progressive neurodegenerative disorder characterized by the loss of dopamine-producing neurons in the brain, leading to motor symptoms such as tremors, rigidity, bradykinesia (slowness of movement), and postural instability. It also includes non-motor symptoms like cognitive impairment, mood disorders, and autonomic dysfunction, requiring comprehensive medical and supportive care.