What are causes of parkinson disease, symptoms which people must notice and visit a doctor? Submitted by agl_jaypee on Wed, 04/13/2022 - 12:21 Parkinson’s disease is a central nervous system disorder in which the brain region that controls our movement deteriorates over time. This neural deterioration results in decreased dopamine level which is a brain chemical that controls coordinated movement. Dopamine plays a crucial role in a variety of mental and physical functions, such as: Voluntary movement Cognition Mood Memory General behaviour Early Signs of Parkinson's disease Read more about What are causes of parkinson disease, symptoms which people must notice and visit a doctor?