Tremor classification
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Tremor classification On the Web |
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Zehra Malik, M.B.B.S[2]
Overview
Tremor may be classified into resting or action tremor. Action tremor includes postural, kinetic (simple or intentional), isometric and task-specific tremor.
Classification
Tremor may be classified into two main groups:
- Resting tremor: Occurs when the body is not moving and is at rest. It could occur in hands, legs, or arms. Resting tremor decreases in intensity with targeted movement. Parkinson's disease and drug-induced parkinsonism exhibit resting tremors.
- Action Tremor: Could occur with any voluntary movement. It is further classified into:
- Postural Tremor: Increases with voluntary movement. Physiologic tremor, essential tremor, drug or alcohol withdrawal and metabolic changes may result in postural tremor.
- Kinetic Tremor:
- Simple kinetic: Not affected by targeted movement. Occurs with normal limb movement.
- Intentional tremor: Increases in intensity by targeted movement. Observed in cerebellar lesion caused by stroke, multiple sclerosis or tumor and lithium or alcohol toxicity.
- Isometric tremor:
- Task-induced tremor: