Tremor types, based on activation condition
| Type of tremor | Definition |
| Action tremor | Tremor that occurs during a voluntary contraction of skeletal muscle. This includes isometric, kinetic and postural tremors |
| Isometric tremor | Tremor that occurs when a muscle contracts against a rigid, stationary object (eg, while making a fist) |
| Kinetic tremor | Tremor that occurs during a voluntary movement (eg, while writing or eating) |
| Postural tremor | Tremor that occurs when the body part is held motionless against the force of gravity (eg, while arms are outstretched in front of the body) |
| Rest tremor | Tremor that occurs in a body part that is supported against gravity and inactive (eg, while lying down) |