This is a progressive neurological disease that affects the brain and causes a movement disorder. It results from a low level of dopamine in the brain. This illness is mostly an age-related degenerative brain condition that causes slowed movements, tremors  and balance problems. This disease also affects the human senses, thinking ability, and mental health. The development of this condition increases as one grows older, the average age at which this illness starts is 60 years and it is more common in men compared to women. It is regarded as the 2nd most common degenerative disease.