Bilateral Hand Tingling: Causes from Peripheral Neuropathy to Cervical Radiculopathy

Common Causes of Bilateral Hand Paresthesia

1. Peripheral neuropathy: Symmetric distal sensory loss. Causes: diabetes (most common), B12 deficiency, alcohol, medications (chemo, HIV drugs), toxins, hypothyroidism.
2. Carpal tunnel syndrome (CTS): Median nerve compression at wrist. Often bilateral. Nocturnal paresthesia in thumb, index, middle, radial ring finger. Tinel's/Phalen's signs.
3. Cervical radiculopathy (C6–C7): Nerve root compression from disc herniation or spondylosis. Neck pain, radiating symptoms, reflex changes.
4. Thoracic outlet syndrome: Neurovascular compression at costoclavicular space. Positional symptoms (arm elevation).
5. Systemic diseases: Multiple sclerosis (disseminated lesions), sarcoidosis, vasculitis, amyloidosis.
6. Vitamin deficiencies: B12 (subacute combined degeneration), B6 (excess or deficiency), folate, vitamin E.
7. Metabolic: Diabetic neuropathy, uremia, hypothyroidism.
8. Medication effects: Chemotherapy (platinum, taxanes), antiretrovirals, metronidazole, isoniazid.
9. Raynaud's phenomenon: Vasospasm → pallor, cyanosis, rubor; numbness/tingling triggered by cold/stress.

Diagnostic Approach

• History: Distribution, timing, triggers, associated symptoms, medications, comorbidities.
• Exam: Neurologic (sensory, motor, reflexes), Tinel's/Phlen's, Adson's, vascular.
• Labs: Glucose, HbA1c, B12, folate, TSH, ESR/CRP, SPEP, ANA.
• Electrodiagnostics: NCS/EMG localizes lesion (neuropathy vs. radiculopathy vs. CTS).
• Imaging: Cervical spine MRI if radiculopathy suspected.

Red Flags for Urgent Evaluation

• Acute onset with weakness, facial droop, speech difficulty → stroke/TIA.
• Rapidly progressive bilateral weakness → Guillain-Barré, spinal cord compression.
• Saddle anesthesia, bowel/bladder dysfunction → cauda equina.