Parkinson's disease is a progressive neurological disorder caused by the loss of dopamine-producing neurons in the brain. It was first described by James Parkinson in 1817 and is characterized by tremors, rigidity, and slowed movement. While the exact cause is unknown, risk factors include age, genetics, and exposure to certain toxins. Treatment focuses on managing symptoms through medications and therapies like physical exercise and deep brain stimulation. Nursing care involves assisting with mobility and daily living, administering medications, and promoting rehabilitation and lifestyle modifications.