Tremor

Definition:

Tremors are a type of shaking movement.

Causes, incidence, and risk factors:

Tremors are caused by problems with the nerves supplying certain muscles. They can affect the whole body, or just certain areas (such as hand tremor).

Disorders where tremor is the primary symptom include:

• familial tremor (runs in families)
• essential tremor (no known cause)
• drug induced tremor

Other disorders, such as Parkinson's disease, may cause tremors along with other symptoms.