Infrared light therapy for neck pain works on a simple principle: the structures that cause most lasting neck pain sit deep, and near-infrared light is the part of the spectrum that can reach them. If your pain comes from a disc, a facet joint, or a compressed nerve root rather than surface muscle tension, how deeply the light travels matters more than almost anything else. Near-infrared wavelengths between 808 and 1064 nm pass through skin and muscle with less loss than red light, delivering energy toward the discs, facet joints, nerve roots, and deep neck muscles where the pain originates. This article reviews what the research shows about infrared light reaching, and acting on, those deep cervical structures.
For an overview of the complete neck pain evidence base, see Red Light Therapy for Neck Pain: Scientific Research Review. For the mechanisms of red light at shorter wavelengths, see Red Light Benefits for Neck Pain.
Key Takeaways
- Near-infrared reaches deeper than red light: A 2025 light-modeling study (a Monte Carlo simulation in a rat model) found that more light reaches the cervical level of the spine than the thoracic level. As a simulation in an animal model, it shows direction, not a measured human dose.
- High-intensity laser ranked first among six physical therapies: A 2025 network meta-analysis ranked high-intensity laser therapy first for neck pain reduction, ahead of shockwave therapy, interferential current, TENS, low-level laser therapy, and ultrasound.
- Human trials show deep-condition benefit: RCTs using near-infrared laser for cervical spondylosis and disc-related pain found significant improvements in pain, disability, and range of motion compared with standard electrotherapy.
- Nerve-repair signal, mostly preclinical: In animal and laboratory studies of peripheral nerve injury, near-infrared light promoted nerve repair, and human trials in spinal-cord and peripheral-nerve injury are encouraging. This is relevant to, though not proof for, compressed cervical nerve roots.
Why Penetration Depth Matters for Neck Pain
Not all neck pain is superficial. Myofascial trigger points in the trapezius sit within reach of red wavelengths. But cervical disc pathology, facet joint inflammation, and nerve root compression occur at depths that require longer wavelengths to deliver a useful dose. The structures driving most chronic neck pain sit beneath skin, fat, and superficial muscle, all of which absorb and scatter light before it arrives.
The same energy-and-repair mechanisms that operate at shorter wavelengths apply here, explained in detail in how red light therapy works; the difference with near-infrared is reach. A 2025 computational study by Chen et al. modeled how light travels through tissue at different spinal levels in a rat model. It found that the cervical region receives more light energy than the thoracic region. Of the four wavelengths tested (660, 808, 980, and 1064 nm), 1064 nm reached the deepest. The practical reading is that the cervical spine appears to be a relatively favorable target for light therapy, because the tissue over the problem structures is thinner than at other spinal levels. But it is a simulation in an animal model, and it was built to study spinal cord injury rather than neck pain, so it points the direction without measuring how much light reaches a human cervical disc.
Stronger support for the wavelength principle comes from human tissue rather than animal models. In a cadaver study, Jagdeo et al. (2012) tested how much 830 nm near-infrared and 633 nm red light passed through intact human soft tissue, bone, and brain. The near-infrared light measurably got through; the red light barely did. Henderson and Morries (2015) measured deeper still, with near-infrared reaching several centimeters into human cadaver tissue at sufficient power. These were head-and-brain models rather than the neck, so they confirm the physics in human tissue without measuring the cervical spine directly. But the bone over the cervical structures is thinner than the skull, so reaching them should be no harder.
The question I always get is whether the light actually reaches the disc or the nerve root. The Monte Carlo modeling suggests the cervical spine is one of the easier targets because the overlying tissue is relatively thin, and 1064 nm gets deepest. That lines up with the clinical results: the spondylosis and radiculopathy trials using 1064 nm produced significant outcomes, and that's hard to explain if the energy isn't arriving where it needs to.— Dr. William Carter, MD
The Wavelength and Intensity Evidence
The 2025 Hao et al. network meta-analysis found that high-intensity laser therapy ranked first among six physical-therapy modalities for neck pain reduction. This was not laser versus no treatment; it was a head-to-head comparison against TENS, ultrasound, interferential current, shockwave therapy, and low-level laser therapy.
Two condition-specific reviews back this up, with honest limits. The 2024 meta-analysis by de la Barra Ortiz et al. found high-intensity laser therapy reduced neck pain and disability, though it rated the evidence as significant but of low certainty owing to study heterogeneity. Xie et al. (2023), pooling eight RCTs, found moderate-quality evidence that high-intensity laser therapy improves pain and cervical range of motion, but did not find it effective for functional activity. So the wavelength-and-intensity case is real and consistent for pain, while the certainty rating and the functional-activity gap keep it from being settled.
Low-level near-infrared wavelengths also have strong evidence. The Lancet meta-analysis (Chow et al., 2009) included studies using 820–904 nm wavelengths. The distinction between high-intensity and low-level delivery matters for treatment speed and depth, but both deliver near-infrared photons to deep cervical structures. How those dose-and-device differences play out for a home device is covered in the LED vs. Laser for Neck Pain review.
Reaching Cervical Discs and Facet Joints
The intervertebral disc and the facet joints are the two primary degenerative structures in the cervical spine. Venosa et al. (2019) tested high-intensity laser therapy at 1064 nm for cervical spondylosis, a condition driven by facet joint and disc degeneration, in a randomized controlled trial. The laser group showed significant improvements in pain, neck disability, and cervical range of motion compared with combined ultrasound and TENS.
Yilmaz et al. (2020) provided converging evidence from cervical disc disease. In a randomized trial comparing 1064 nm laser plus exercise against ultrasound/TENS plus exercise, the laser group showed greater improvements in range of motion, pain, and quality of life. Because the target tissue in that trial was the disc and adjacent nerve root, the clinical benefit is consistent with near-infrared light reaching those deeper structures, though the trials measure outcomes, not the photon dose arriving at the disc itself.
Nerve Roots and Radiculopathy
Compressed or irritated cervical nerve roots produce radiating arm pain, numbness, and weakness, symptoms that begin deep in the cervical spine, at the small opening where the nerve root exits. Near-infrared light's deeper reach makes it relevant here.
Ince et al. (2023) conducted a 90-patient RCT for cervical radiculopathy, comparing high-intensity laser therapy plus exercise against placebo plus exercise and against exercise alone. The laser group showed significantly greater improvements in arm pain, neuropathic pain, neck disability, and quality of life, sustained at the 12-week follow-up. Ninety patients, three arms, 12-week durability. For a condition where the pathology sits deep enough that reaching it is genuinely uncertain, that is a substantial result.
The nerve-repair rationale rests mainly on preclinical work. Rosso et al. (2018), reviewing studies of peripheral nerve regeneration (largely animal models such as sciatic-nerve injury) found that near-infrared light accelerated nerve repair, with more myelinated fibers and better recovery of nerve function. Weimer and Kolling da Rocha (2025) reviewed randomized human trials of photobiomodulation in incomplete spinal-cord and peripheral-nerve injuries and found encouraging motor and sensory outcomes. Neither studied cervical nerve roots directly, so this evidence supports the biological plausibility of nerve-level benefit rather than proving it for radiculopathy.
Deep Cervical Musculature
The deep muscles that stabilize the neck sit closer to the vertebrae than the trapezius and sternocleidomastoid, and reaching them is part of the rationale for choosing near-infrared over red light. Direct evidence that light reaches these specific deep stabilizers in a living human neck does not yet exist.
What the clinical data show is more general. A randomized trial by De Toni et al. (2022) in sewing-machine operators with neck pain found that photobiomodulation, ultrasound, and exercise all reduced pain and improved muscle activation, with photobiomodulation performing comparably to ultrasound. That trial measured the surface muscles (the upper trapezius and sternocleidomastoid), so it speaks to neck-muscle function broadly rather than to the deep stabilizers specifically. The deeper-muscle benefit remains a reasonable expectation based on penetration, not a measured finding.
Conclusion
The case for near-infrared light in neck pain rests on a straightforward physical fact: the structures causing most chronic neck pain sit deeper than red wavelengths reach efficiently. Discs, facet joints, nerve roots, and the deep stabilizer muscles all lie beneath tissue that absorbs shorter wavelengths before a useful dose arrives, and near-infrared wavelengths in the 808–1064 nm range are built to get past that barrier. The light-modeling work suggests the cervical spine is a favorable target because the overlying tissue is relatively thin, and the clinical results line up: RCTs for cervical spondylosis and disc-related pain found significant improvements in pain, disability, and range of motion, and a 90-patient radiculopathy trial found near-infrared laser plus exercise outperformed both placebo and exercise alone, with benefits holding at 12 weeks.
For someone choosing between wavelength options, the evidence supports combining red and near-infrared rather than picking one. Red wavelengths address the surface muscles and pain modulation; near-infrared reaches the deeper structures where the degenerative and compressive problems start. Together they cover more of the cervical pain biology than either alone. For how this translates into a device worn on the neck, see how CuraYou's ProWave Deep Healing Pad applies red and infrared light to the cervical area, and for the full clinical picture see PBM for Neck Pain: Clinical Evidence.
