TENS Therapy for Neuropathy: Pain Relief, Circulation, and Clinical Use

Transcutaneous Electrical Nerve Stimulation (TENS) is a non-invasive, drug-free modality used as adjunctive therapy for neuropathic pain.

Mechanisms of Action

• Gate Control Theory: High-frequency (50–100 Hz) stimulation activates Aβ fibers → inhibits nociceptive transmission in dorsal horn.
• Endogenous Opioid Release: Low-frequency (2–10 Hz) stimulates β-endorphin, enkephalin, dynorphin release → descending inhibition.
• Vasodilation: Electrical stimulation → local NO release, axon reflex → increased microcirculation → improved nerve perfusion.
• Anti-inflammatory: Modulates cytokine release (reduces TNF-α, IL-1β) in animal models.

Clinical Evidence

• Diabetic peripheral neuropathy: Moderate evidence for pain reduction (Cochrane reviews).
• Chemotherapy-induced neuropathy: Some benefit; less consistent.
• Postherpetic neuralgia, radiculopathy: Variable response.

Practical Application

• Electrode placement: Over painful area, along nerve path, or contralateral homologous site.
• Parameters: Start high-freq (80–100 Hz), pulse width 100–200 µs, intensity strong but comfortable (paresthesia, not pain).
• Duration: 30–60 min/session, 2–4×/day; can use continuously with wearable units.
• Trial period: 2–4 weeks to assess response.

Contraindications & Precautions

• Pacemaker/ICD (unless cardiology-approved); pregnancy (abdomen/pelvis); epilepsy; carotid sinus; malignancy; impaired sensation/skin integrity.
• Skin irritation (electrode allergy) – use hypoallergenic gels.

Integration

TENS complements – not replaces – pharmacotherapy (gabapentinoids, SNRIs, TCAs), physical therapy, and lifestyle modification. Best results with multimodal approach.