Parkinson's disease is a disorder of the brain that leads to shaking (
Paralysis agitans; Shaking palsy
Causes, incidence, and risk factors
Parkinson's disease most often develops after age 50. It is one of the most common nervous system disorders of the elderly. Sometimes Parkinson's disease occurs in younger adults. It affects both men and women.
In some cases, Parkinson's disease occurs in families. When a young person is affected, it is usually because of a form of the disease that runs in families.
Nerve cells use a brain chemical called
Parkinson's in children may occur because the nerves are not as sensitive to dopamine. Parkinson's is rare in children.
The term "parkinsonism" refers to any condition that involves the types of movement changes seen in Parkinson's disease. Parkinsonism may be caused by other disorders (such as