A tremor is a type of involuntary shaking movement. Involuntary means you shake without trying to do so. A tremor is often most noticeable in your hands, but may affect any body part (even your head or voice).

There are three main types of tremors:

• Resting or static tremors occur when your hand or affected body part is at rest.
• Kinetic and intention tremors occur when you are moving your hand or affected body part when you are doing something like pressing a button or touching the tip of your nose with your finger. The tremor will usually disappear while the affected body part is at rest.
• Postural or action tremors occur when you are holding your hand or affected body part in a particular position for a period of time. This may happen when you are writing, holding a cup, or when you stand up straight.