Peripheral neuropathy is one of the few topics here where the research covers not just symptom relief but the possibility of nerve repair. It is also one where self-treating carries real risk, particularly if you have diabetes.
What it is
Peripheral neuropathy involves damage to nerves outside the brain and spinal cord, most commonly from diabetes, chemotherapy or nerve compression, producing numbness, burning and pain in the hands and feet.
Two features make it distinctive. Symptoms usually start furthest from the spine, in the toes and fingertips, because the longest nerves are affected first. And it produces an odd combination of too little and too much sensation at once: numbness to touch alongside burning pain that is worse at night.
Two threads in the research
Research on photobiomodulation here has two threads, and the second is more ambitious than most topics on this site.
Reducing neuropathic pain. Symptom management, which is where most treatment for neuropathy sits.
Supporting nerve repair itself, with animal studies showing increased Schwann cell activity and faster axonal regrowth.
Schwann cells produce the myelin sheath around peripheral nerves and guide regrowth after damage. Unlike nerves in the brain and spinal cord, peripheral nerves can regenerate, slowly, if the underlying cause is removed. So supporting that process is at least biologically plausible rather than wishful.
What happened in people
Human trials, mostly small, report reduced pain scores and some improvement in sensation in diabetic neuropathy, with more mixed findings in chemotherapy-induced neuropathy.
Improvement in sensation is the more interesting outcome, because it suggests something changed in nerve function rather than only in pain perception.
The split between diabetic and chemotherapy-induced neuropathy is worth noting. They have different mechanisms, and it should not be assumed that a result in one transfers to the other.
Reviews describe the evidence as promising but not conclusive. That is a fair summary and we will not upgrade it.
The cause matters more than the treatment
Neuropathy always has an underlying cause that needs identifying and managing.
This is the most important line on the page. Causes include diabetes and prediabetes, vitamin B12 deficiency, thyroid disorders, alcohol, certain medications including some chemotherapy agents, autoimmune conditions, kidney disease and nerve compression.
Several are treatable, and some are reversible if caught early. B12 deficiency is a good example: straightforward to test, straightforward to treat, and capable of causing permanent damage if left. Treating the symptoms while the cause continues means the damage continues too.
The diabetic foot warning
In diabetes, foot sensation loss carries real risk, so any change in symptoms should be reviewed by your clinician rather than self-treated.
Loss of sensation is what allows a small injury to become an ulcer without being noticed. Pain is the alarm system, and neuropathy disables it.
If you have diabetic neuropathy: check your feet daily including between the toes, never walk barefoot, check inside shoes before wearing them, attend your annual foot check, and treat any break in the skin as a same-week medical matter. Our foot ulcer page covers this in more detail.
A change in symptoms, in either direction, is information your clinician needs. Improvement can matter as much as worsening.
Practical use
- Over the affected area, hands or feet, on bare skin
- Near-infrared for depth, since peripheral nerves sit below the surface
- Ten to twenty minutes per area
- Watch the temperature carefully. Reduced sensation means you may not feel heat properly. Keep distance generous and check the skin afterwards rather than relying on how it felt
- Tell your clinician before you start, particularly with diabetes
- Do not use it on skin that is broken without medical advice
That temperature point is not a formality. If you cannot reliably feel heat, the usual safety signal is missing.
Common questions
Does red light therapy help peripheral neuropathy? Small human trials report reduced pain scores and some improvement in sensation in diabetic neuropathy, with more mixed findings in chemotherapy-induced neuropathy. Reviews describe the evidence as promising but not conclusive.
Can it repair nerves? Animal studies show increased Schwann cell activity and faster axonal regrowth. That has not been established in humans.
Is it safe with diabetic neuropathy? Discuss it with your clinician first, and be careful with heat, since reduced sensation means you may not feel it.
Does it treat the cause? No. Neuropathy always has an underlying cause that needs identifying and managing.
Red or near-infrared? Near-infrared, for depth.
Where to start
Speak to your clinician first. If they support trying it, a targeted panel with near-infrared suits hands and feet.
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