Movement disorders are a group of diseases and syndromes affecting the ability to produce and control bodily movements.
It seems simple and effortless, but normal movement requires an astonishingly complex system of control. Disruption of any portion of this system can cause a person to produce movements that are too weak, too forceful, too uncoordinated, or too poorly controlled for the task at hand. Unwanted movements may occur at rest. Intentional movement may become impossible. Such conditions are called movement disorders.
Abnormal movements are symptoms of underlying disorders. In some cases, the abnormal movements are the only symptoms. Childhood disorders or conditions that may cause abnormal movements include:
The incidence rates and demographics vary for different types of movement disorders. Restless legs syndrome (RLS) affects approximately 12 million people in the United States. The disorder can affect males and females and can begin at any age, although it may become worse as a person gets older. The most common ataxia is Friedreich's ataxia; in the United States, it affects one in 50,000 people, both male and female.
Richard Robinson, Angela M. Costello, Thomson Gale, Gale, Detroit,