Learn more about Parkinson's disease
Loss of nerve cells: Exactly what causes the loss of these dopamine-producing nerve cells is unclear.
What are the symptoms: PD symptoms generally develop slowly over years, and can differ from from one person to another.
When do symptoms develop: Most people with Parkinson's start to develop symptoms when they're over 50.
Other non-motor symptoms: Some people with the disorder may experience psychosis — sensing things that aren't there (hallucinations).
Secondary symptoms: Besides these more obvious tell-tale signs, PD can also manifest itself by way of gait and balance problems.
What is dopamine: Dopamine plays a vital role in regulating the movement of the body.
What is dopamine: Dopamine plays a vital role in regulating the movement of the body.
Who's affected: According to the European Parkinson's Disease Association (EPDA), about 10 million people.
Psychological symptoms: Besides physical symptoms, PD can also induce psychological problems, typically depression.
Causes: The disorder is caused by a loss of nerve cells in part of the brain called the substantia nigra.