Burning Sensation in Legs and Hands: Causes
The most common cause of burning sensations in the legs and hands is peripheral neuropathy, particularly diabetic peripheral neuropathy (DPN) and small fiber sensory neuropathy (SFSN), which affect up to 50% of diabetic patients and characteristically present with burning pain in distal extremities. 1
Primary Causes by Category
Metabolic/Endocrine Neuropathies
Diabetic peripheral neuropathy is the leading cause, present in up to 50% of diabetic patients with long disease duration 1
- Burning pain is the most prominent symptom and most frequent reason patients seek medical attention
- Symptoms typically start in feet and progress proximally up the legs, later involving hands
- Pain characteristically worsens at night, causing severe sleep disturbance
- Associated with "electrical shock" sensations, lancinating pain, uncomfortable tingling, and allodynia (pain from normally non-painful stimuli like bedclothes)
Prediabetic neuropathy - small fiber neuropathy can occur even before diabetes diagnosis 2
Small Fiber Neuropathy Phenotypes
Small fiber sensory polyneuropathy (SFSN) presents as burning pain affecting feet with allodynia and sometimes erythromelalgia (red, hot, painful skin) 3
- Involves both autonomic and somatic C fibers concurrently
- Can occur independently of diabetes
Neurovascular Disorders
- Erythromelalgia - rare neurovascular disorder with intermittent severe burning pain, erythema, and warmth in extremities triggered by heat 4
- Chronic mountain sickness - "burning feet-burning hands syndrome" in high-altitude residents, though milder symptoms can occur in healthy controls at altitude 5
Other Neurological Causes
- Autonomic neuropathy (amyloidosis, autoimmune) - autonomic nerves affected disproportionately, with burning and circulatory instability in feet 3
- Spinal cord injury - "burning hands syndrome" with burning dysesthesias and paresthesias 6
- Nerve entrapments, fasciitis, claudication - can masquerade as neuropathy 1
Key Risk Factors
- Substance abuse and tobacco use significantly increase risk of developing chronic neuropathic pain with burning sensations 7
- Non-Swedish birth (in Swedish study) showed 2.3 times higher probability of reporting burning sensations, suggesting ethnic/genetic factors 2
- Smoking increases odds by 1.69 times regardless of ethnicity 2
Important Clinical Distinctions
Pattern Recognition
The distribution and progression matter:
- Distal symmetric pattern (feet → legs → hands) suggests length-dependent polyneuropathy like DPN
- Concurrent hand and foot involvement may indicate systemic process, toxin exposure, or specific syndromes
- Isolated burning without other neuropathic features warrants consideration of vascular or dermatological causes
Associated Features That Guide Diagnosis
- Autonomic symptoms (sweating abnormalities, circulatory instability) suggest autonomic fiber involvement 3
- Erythema and warmth triggered by heat suggests erythromelalgia 4
- Night-time predominance with sleep disturbance is classic for DPN 1
- Contact allodynia (pain from socks, bedclothes) indicates sensitization typical of neuropathic pain 1
Critical Pitfall
Burning sensations are NOT reliably associated with HbA1c levels 2, meaning normal glucose control doesn't exclude diabetic neuropathy, and elevated HbA1c doesn't confirm it as the cause. The diagnosis requires clinical symptoms, signs (decreased ankle reflexes, decreased distal sensation), and abnormal nerve conduction studies 3.
Diagnostic Approach Priority
Based on guidelines, evaluation should include 3:
- Clinical symptoms and signs assessment
- Electrodiagnostic studies (nerve conduction studies have nearly same sensitivity as heart rate variability testing for detecting diabetic polyneuropathy)
- Autonomic testing when autonomic involvement suspected (heart rate variability to deep breathing has ~80% specificity)
- Consider skin biopsy for small fiber neuropathy when standard testing is normal but clinical suspicion high