Parkinson's disease mostly affects older people but can also occur in younger adults. The symptoms are the result of the gradual degeneration of nerve cells in the part of the brain that controls body movement.

Parkinson's disease is a brain disorder that causes a gradual loss of muscle control. Symptoms tend to be mild at first and can sometimes be overlooked.

It’s not clear what causes the abnormal nerve function linked to Parkinson's disease. Heredity, toxins in the environment, and oxidative stress may play some role.

Get answers to common questions about Parkinson's Disease, including causes, prevention, and treatment.