Disorders associated with tremor

Description

Tremor is an involuntary oscillation of a body part and is commonly classified according to the behavioural circumstances in which it occurs. Tremor may occur during attempted relaxation (rest tremor), during a voluntarily held posture (postural tremor), or during a voluntary movement (kinetic tremor). [1]

Subcategories

• 8A04.0 Enhanced physiological tremor

  This is a high frequency, low amplitude tremor present with posture or action. It represents an exacerbation of a physiologic tremor which may have been worsened by drugs, stress, anxiety, etc. [1]

• 8A04.1 Essential tremor or related tremors

  Essential tremor is the most common form of tremor of moderate frequency ranging from 7-12 Hz and presents as a postural and kinetic tremor of the hands. It may also be present in the head/neck, and voice. [1]

• 8A04.2 Rest tremor

  Resting tremors happen while the patient is sitting or lying down and relaxed. People who have a resting tremor can usually stop the tremor by deliberately moving the affected body part. It usually occurs in the setting of Parkinsonism. [1]

• 8A04.3 Secondary tremor
• 8A04.4 Functional tremor

  Functional movement disorder presenting predominantly with tremor. The tremor might be variable in frequency and distractible on testing, either entraining or ceasing in response to contralateral externally cued rhythmical movements provided by the examiner. Functional tremor is that in which no cause has been identified after investigation. [1]

References

1. World Health Organization. International Classification of Diseases, 11th Revision, for Mortality and Morbidity Statistics (ICD-11 MMS), 2026-01 release. World Health Organization; 2026.

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