Hand Tremors: Differential Diagnosis and When to Seek Evaluation

Persistent or recurrent hand tremor warrants neurological evaluation. Tremor classification guides diagnosis.

Tremor Types and Key Features

• Essential tremor (ET): Action (postural/kinetic) tremor, 4–12 Hz; bilateral, asymmetric; may affect head, voice; alcohol-responsive; autosomal dominant common. Onset >40 yrs.
• Parkinsonian tremor: Rest tremor (4–6 Hz), "pill-rolling"; unilateral onset; + bradykinesia, rigidity, postural instability. Improves with movement.
• Enhanced physiologic tremor: High-frequency, low-amplitude; triggered by caffeine, stress, fatigue, thyrotoxicosis, hypoglycemia, drugs (beta-agonists, lithium, valproate, antidepressants).
• Cerebellar tremor: Intention (kinetic) tremor worsening at target; dysmetria, ataxia; MS, stroke, tumor, degenerative.
• Dystonic tremor: Irregular, task-specific; improves with sensory trick (geste antagoniste).
• Orthostatic tremor: 13–18 Hz; legs/trunk on standing; sensation of unsteadiness.
• Drug/withdrawal: Alcohol, benzos, opioids withdrawal; sympathomimetics.

Red Flags for Urgent Evaluation

• Acute onset with focal deficits (stroke).
• Progressive gait/balance impairment.
• Cognitive/behavioral changes.
• Systemic signs (fever, weight loss).

Workup

• History: onset, triggers, alleviating factors, medications, family history, alcohol.
• Exam: tremor classification, cranial nerves, tone, gait, cerebellar testing.
• Labs: TSH, free T4, glucose, electrolytes, Ca/Mg, B12, copper, ceruloplasmin (Wilson's), ANA.
• Imaging: MRI brain (if cerebellar/parkinsonian features), DaTscan (dopamine transporter) for PD vs. ET.

Treatment Principles

• ET: Propranolol, primidone first-line; topiramate, gabapentin, DBS/thalamotomy refractory.
• PD: Levodopa/carbidopa, dopamine agonists.
• Enhanced physiologic: remove trigger, beta-blocker if needed.