Nerve stimulation and neuromodulation for painful nerves: a narrative review.

Nerve injuries can cause intense, persistent pain that's difficult to treat with conventional methods. Researchers reviewed three different types of electrical stimulation therapies that may help relieve this type of nerve pain: TENS, PENS, and PNS. These treatments work based on the "gate control theory," which suggests that gentle electrical signals can block pain messages from reaching the brain. TENS (transcutaneous electrical nerve stimulation) is the most accessible option—it's a non-invasive device you can buy over-the-counter and use at home by placing electrode patches on your skin. PENS (percutaneous electrical nerve stimulation) is similar to electroacupuncture, using small needles inserted near painful areas to deliver electrical currents. PNS (peripheral nerve stimulation) is the most intensive option, involving temporarily or permanently implanted electrodes that directly stimulate specific nerves. The review found these therapies helpful for various pain conditions including chronic back pain, neck pain, nerve pain, muscle pain, and post-surgical pain. TENS is particularly appealing because it's affordable, safe, doesn't involve medications, and has no risk of overdose or toxicity. PENS offers a middle ground by combining electrical therapy with acupuncture-like needle placement. PNS provides the most precise targeting for severe cases. For patients exploring acupuncture, PENS represents an interesting bridge between traditional electroacupuncture and modern pain management technology, offering minimally invasive treatment with electrical enhancement. To explore these options safely, seek treatment from a licensed acupuncturist or pain management specialist trained in electrical stimulation techniques.

This narrative review examines TENS, PENS, and PNS modalities for neuropathic pain management, grounded in Melzack and Wall's gate control theory whereby non-nociceptive Aβ fiber stimulation inhibits Aδ and C fiber pain transmission via dorsal horn interneurons. TENS offers non-invasive, self-administered, over-the-counter neuromodulation without pharmacological risks. PENS provides minimally invasive therapy integrating electrical stimulation with electroacupuncture principles through needle-based current delivery near target neural structures. PNS enables precise peripheral nerve targeting via temporary or permanent electrode implantation for extended therapeutic duration. Clinical applications span chronic musculoskeletal pain, neuropathic conditions, myofascial pain syndromes, and post-operative analgesia. The review lacks specific sample sizes or effect size data, functioning primarily as a mechanistic and procedural overview. Clinical takeaway: Electrical stimulation modalities represent a graduated treatment continuum from non-invasive (TENS) to minimally invasive (PENS) to implantable (PNS) options, with PENS offering particular relevance to acupuncture practitioners seeking electromodulation integration. Selection depends on pain chronicity, localization, and patient tolerance for invasiveness.