Parkinson's Disease is a chronic disease, progressive, and may affect the brain. The things that patients experience are movement-related disorders, meaning they have tremors, slowness of movement, and their arms and legs are stiffer. These are the motor symptoms they present.
The reasons why they have these symptoms is the degeneration within certain specific cells in the brain that produces dopamine, in other words, due to the lack of dopamine which results in these symptoms.
