what is parkinson's disease.
Parkinsonâs disease (PD) is a disorder that affects the nervous system. It is a chronic condition that slowly worsens over time. Parkinsonâs disease causes symptoms that impact a personâs ability to move (motor symptoms) such as tremor at rest, stiffness of the limbs, difficulty walking, and impaired balance. Other motor symptoms can also include small handwriting, stooped posture, softness of voice, and problems swallowing.