What are the differential diagnoses and recommended work‑up for a patient presenting with a burning sensation in the hands?

Burning Sensation in the Hands: Differential Diagnosis and Work-Up

A burning sensation in the hands most commonly indicates small fiber neuropathy, erythromelalgia, or chemotherapy-induced peripheral neuropathy (CIPN), and the work-up should begin with a detailed medication history (especially chemotherapy agents), assessment for triggers (heat, exercise), and examination for erythema and temperature changes. 1

Key Clinical Patterns to Identify

Small Fiber Neuropathy Pattern

• Burning pain with decreased pain and temperature sensation in the affected areas is the hallmark of small fiber neuropathy 1
• Look specifically for symmetrical "glove" distribution starting distally in the hands 1
• Pin-prick testing easily potentiates the pain and reveals decreased pain perception 1
• This pattern occurs with chemotherapy agents including vinca alkaloids, taxanes, thalidomide, and bortezomib 1

Erythromelalgia Pattern

• Episodic burning pain accompanied by visible erythema and warmth of the hands distinguishes erythromelalgia from other causes 1
• Symptoms are triggered by physical activity and warm temperatures, and characteristically relieved by cooling the affected areas 1
• The hands may appear completely normal between episodes, leading to missed diagnoses 1
• This condition carries increased morbidity, mortality, and suicide risk compared to the general population, making prompt diagnosis critical 1

Chemotherapy-Induced Neuropathy Pattern

• Symptoms typically occur within the first 2 months of chemotherapy treatment and progress during active treatment 1
• Burning sensation in hands (and feet) represents small fiber involvement, often with accompanying dysesthesia, allodynia, and hyperalgesia 1
• A "coasting phenomenon" may occur where neuropathy worsens even after stopping platinum drugs or paclitaxel 1

Essential Work-Up Components

History Taking

• Medication history is paramount: Document all current and recent chemotherapy agents, especially platinum compounds, vinca alkaloids, taxanes, thalidomide, and bortezomib 1
• Substance abuse and tobacco use history: These are significant risk factors for developing chronic neuropathic pain with burning sensations 2
• Trigger identification: Ask specifically about heat exposure, exercise, and cooling behaviors (including extreme measures like ice water immersion) 1
• Temporal pattern: Determine if symptoms are constant versus episodic, and whether visible changes accompany the burning 1
• Family history: Approximately 5% of erythromelalgia cases have autosomal dominant inheritance with SCN9A gene variants 1

Physical Examination

• Observe for erythema, warmth, and swelling during symptomatic periods—these findings suggest erythromelalgia 1
• Test pain and temperature sensation with pin-prick and temperature discrimination in a symmetrical pattern 1
• Assess vibration sense and proprioception with tuning fork testing to evaluate large fiber involvement 1
• Check deep tendon reflexes for reduction or absence, indicating motor fiber involvement 1
• Examine for autonomic dysfunction: Look for postural hypotension, bladder disturbances, or constipation 1

Diagnostic Testing

• Baseline neurological evaluation before every chemotherapy cycle is critical but often overlooked 1
• Electromyography (EMG) with nerve conduction studies can identify pre-existing subclinical neuropathy as a risk factor for CIPN 1
• However, conventional nerve conduction parameters often do not mirror patients' symptoms and are not suitable for monitoring CIPN severity 1
• Serum neurofilament light (NfL) is promising but cannot be recommended for routine practice yet 1
• Neurologist consultation should be obtained if uncertainty exists about the diagnosis or if pre-existing neuropathy is suspected 1

Critical Pitfalls to Avoid

• Do not dismiss intermittent symptoms: Erythromelalgia may present with completely normal examination between episodes, but the condition carries serious morbidity and mortality risks 1
• Do not delay baseline assessment in chemotherapy patients: Early detection of CIPN before it becomes irreversible requires evaluation before every treatment cycle 1
• Do not rely solely on EMG/nerve conduction studies: These tests frequently fail to correlate with symptom severity in small fiber neuropathy 1
• Do not overlook substance abuse and tobacco history: These factors significantly increase risk for chronic neuropathic pain with burning sensations 2

Management Considerations Based on Diagnosis

For Chemotherapy-Induced Neuropathy

• Gabapentin or pregabalin with ascorbic acid provides the most significant pain relief in patients with burning sensations from CIPN 2
• Patients describing "burning sensations" are more likely to develop refractory pain requiring aggressive management 2

For Erythromelalgia

• Lifestyle modifications to avoid heat triggers and exercise are essential 1
• Cooling measures provide symptomatic relief but patients may engage in extreme behaviors (prolonged ice water immersion) that cause additional tissue damage 1
• No treatment guidelines exist for this complex disorder, requiring individualized pharmacologic approaches 1

For Burn-Related Neuropathy

• If there is any history of hand burns, chronic neuropathic pain with burning sensations occurs in approximately 6% of cases 2
• Gabapentin and ascorbic acid are associated with significant pain score decreases in this population 2