Parkinson's disease (or PD, sometimes simply "Parkinson's") is a disease that slowly damages the central nervous system.
The central nervous system is made up of the brain and spine. When a person gets Parkinson's disease, the cells that make dopamine in a part of the brain die. Dopamine cells send information to other cells which makes us do the actions we do.[1][2] Because of this, Parkinson's disease mainly affects the body's motor system.
Parkinson's disease is a disease that gets worse over time. People normally get Parkinson's disease when they are over 50 years old. It is sometimes very hard for doctors to detect.