Parkinson’s disease is a progressive neurological disorder affecting movement control, caused by the degeneration of dopamine-producing neurons in the brain. Symptoms include tremors, muscle rigidity, slow movements (bradykinesia), and balance difficulties. Other signs can include speech changes, writing difficulties, and non-motor symptoms like sleep disturbances and cognitive impairment. While the exact cause is unknown, genetic and environmental factors play a role. Diagnosis is based on medical history, neurological examination, and symptom observation. There is no cure, but treatments like medications, physical therapy, and sometimes surgery (e.g., deep brain stimulation) help manage symptoms and improve quality of life.