What are the causes, appropriate workup, and management for a patient presenting with a burning sensation in the hands?

Burning Sensation of Hands: Causes, Workup, and Management

Most Likely Diagnoses to Consider

The burning sensation in hands most commonly results from peripheral neuropathy (particularly diabetic or small fiber neuropathy), erythromelalgia, or nerve injury/neuroma formation. 1, 2

Key Differential Diagnoses

• Diabetic peripheral neuropathy: The most common cause worldwide, affecting over 206 million people; presents with burning, tingling, or numbness in a length-dependent "stocking and glove" distribution 1, 2
• Erythromelalgia: Rare disorder characterized by episodic burning pain with visible erythema and warmth of hands, triggered by heat or exercise, relieved by cooling 1
• Neuroma formation: Post-traumatic or post-surgical nerve injury causing spontaneous burning pain with hyperexcitability of damaged nerves 3
• Chemotherapy-induced peripheral neuropathy: Burning sensations from neurotoxic agents (cisplatin, paclitaxel, vincristine) 2, 4
• Small fiber neuropathy: Isolated small fiber involvement causing burning pain without large fiber signs 1

Critical History Elements

Symptom Characteristics

• Pain quality: Burning suggests small fiber involvement; adding tingling/numbness suggests mixed fiber neuropathy 1, 5, 4
• Distribution pattern: Symmetric "stocking-glove" pattern indicates length-dependent neuropathy; asymmetric suggests mononeuropathy or neuroma 2, 6
• Temporal pattern: Constant pain suggests neuropathy; episodic pain with visible redness suggests erythromelalgia 1
• Triggers: Heat/exercise triggering with relief by cooling is pathognomonic for erythromelalgia 1

Associated Features

• Visible changes: Erythema and warmth during episodes strongly suggest erythromelalgia 1
• Autonomic symptoms: Orthostatic hypotension, bladder dysfunction, or gastroparesis suggest diabetic autonomic neuropathy 1
• Motor weakness: Distal weakness indicates large fiber involvement and more advanced neuropathy 2, 6

Risk Factors to Elicit

• Diabetes history: Screen all patients with fasting glucose 1, 2, 6
• Medication exposure: Chemotherapy agents, amiodarone, HIV medications, alcohol use 2, 6
• Substance use: Tobacco and substance abuse increase risk of chronic neuropathic pain 7
• Family history: Early-onset burning (childhood/adolescence) with family history suggests hereditary erythromelalgia 1, 8

Physical Examination Priorities

Sensory Testing

• Small fiber function: Test pinprick and temperature sensation; loss indicates small fiber neuropathy 1
• Large fiber function: Test vibration with 128-Hz tuning fork; abnormal suggests mixed neuropathy 1
• Protective sensation: Perform 10-g monofilament testing to identify feet at risk for ulceration 1

Vascular and Skin Assessment

• During symptomatic episode: Document erythema, warmth, and swelling if present (diagnostic for erythromelalgia) 1
• Tinel's test: Tap over suspected nerve injury sites; pain reproduction suggests neuroma 3

Motor and Autonomic Evaluation

• Distal muscle strength: Weakness indicates advanced neuropathy with large fiber involvement 2, 6
• Orthostatic vital signs: Blood pressure drop >20/10 mmHg suggests autonomic neuropathy 1

Initial Laboratory Workup

Order these tests for all patients with burning hand sensation: 2, 6

1. Fasting blood glucose or HbA1c: Diabetes is the most common cause (>50% of cases in Western populations) 1, 2
2. Vitamin B12 with metabolites (methylmalonic acid ± homocysteine): Deficiency causes reversible neuropathy 2, 6
3. Complete blood count with differential and platelet count: Essential to detect myeloproliferative disorders underlying erythromelalgia (present in ~5% of cases) 1, 8
4. Serum protein electrophoresis with immunofixation: Screens for monoclonal gammopathies 2, 6
5. Comprehensive metabolic panel: Evaluates renal function and electrolytes 6
6. Thyroid-stimulating hormone: Hypothyroidism can cause neuropathy 6

Additional Testing Based on Clinical Suspicion

For suspected erythromelalgia: 1, 8

• Repeat CBC every 6-12 months even if initially normal (myeloproliferative disorders may emerge years after symptom onset)
• Consider autoimmune screening (ANA, ENA) for secondary causes
• SCN9A genetic testing if early-onset (<20 years) or positive family history

For suspected small fiber neuropathy: 1, 8

• Thermoregulatory sweat testing: Most sensitive test (abnormal in ~90% of erythromelalgia patients)
• Quantitative sudomotor axon reflex test (QSART): Functional assessment of small fiber autonomic function
• Skin biopsy for epidermal nerve fiber density has low sensitivity (abnormal in minority of cases only)

For suspected large fiber involvement: 1, 8

• Electromyography and nerve conduction studies: Abnormal in ~50% of patients with erythromelalgia; essential for confirming large fiber neuropathy

Management Algorithm

First-Line Pharmacologic Treatment

Initiate one of these medications as monotherapy: 1

1. Pregabalin: α2-δ calcium channel ligand, recommended by American Diabetes Association for neuropathic pain 1
2. Duloxetine: SNRI with strong evidence for diabetic neuropathy and chemotherapy-induced neuropathy 1
3. Gabapentin: Alternative α2-δ ligand; 1200 mg daily achieves ≥50% pain reduction in 38% of diabetic neuropathy patients 1, 2

Common pitfall: Starting multiple agents simultaneously makes it impossible to determine which is effective or causing side effects 1

Adjunctive Treatments

For refractory pain, consider adding: 7

• Ascorbic acid: Associated with significant pain score reduction in burn-related neuropathic pain
• Combination therapy: May provide added benefit when monotherapy fails 2

For erythromelalgia specifically: 1

• Aspirin: More likely to respond if associated with myeloproliferative disease
• Lifestyle modifications: Avoid heat triggers, use fans (not ice water immersion which causes tissue damage)
• Topical cooling measures: Safe cooling without ice or water immersion to prevent ulceration

Non-Pharmacologic Interventions

Recommend to all patients: 1

• Regular physical activity: Improves neuropathic pain and prevents deconditioning
• Acupuncture: Evidence-based option for musculoskeletal and neuropathic pain 1
• Physical therapy referral: For patients with functional limitations 1

Treatment of Underlying Cause

Address reversible etiologies: 1, 2

• Optimize glycemic control: Prevents progression in type 1 diabetes; slows progression in type 2 diabetes
• Vitamin B12 supplementation: If deficient (though complete reversal uncommon)
• Discontinue offending medications: If medication-induced neuropathy identified
• Treat myeloproliferative disorders: If underlying erythromelalgia

Critical Pitfalls to Avoid

1. Dismissing normal initial CBC in suspected erythromelalgia: Myeloproliferative disorders can emerge 2.5 years (median) after symptom onset; maintain periodic monitoring every 6-12 months 1, 8

2. Relying on skin biopsy for small fiber neuropathy diagnosis: Sensitivity is poor; thermoregulatory sweat testing is far superior (90% vs minority of cases) 1, 8

3. Missing erythromelalgia due to normal examination between episodes: Symptoms are intermittent; diagnosis requires clinical history and examination during symptomatic episode 1

4. Allowing patients to use ice water immersion for erythromelalgia: This causes immersion foot, ulceration, and tissue damage; counsel on safe cooling methods 1

5. Expecting complete pain resolution: Even with optimal treatment, ≥50% pain reduction occurs in only 38% of patients; set realistic expectations 2

6. Overlooking "burning sensation" as predictor of refractory pain: This specific descriptor identifies patients more likely to develop treatment-resistant chronic neuropathic pain 7

When to Refer

Refer to neurology if: 6

• Initial laboratory evaluation is inconclusive
• Electrodiagnostic studies needed to differentiate axonal from demyelinating disease
• Specific antibody assays or nerve biopsy required
• Symptoms progress despite treatment

Refer to specialized burn center or pain specialist if: 7

• Post-burn neuropathic pain develops
• Refractory pain despite gabapentinoids and duloxetine