Red light therapy can reduce chronic joint and back pain for many people. Meta-analyses show meaningful pain relief for knee osteoarthritis and chronic neck pain, and the American College of Physicians lists it as a first-line, non-drug option for chronic low back pain. Results depend on correct dosing and work best alongside hands-on treatment.
Chronic pain is now remarkably common. According to the CDC's National Center for Health Statistics, 24.3% of U.S. adults had chronic pain in 2023 — up from 20.4% in 2019 — and 8.5% had pain severe enough to frequently limit work or daily life.
If you're one of them, you've probably seen red light therapy promoted as a solution. Here's what the evidence supports, joint by joint, and where it fits in a real treatment plan.
Does red light therapy help chronic back pain?
There's reasonable support for it as part of a non-drug approach. In its 2017 low back pain guideline, the American College of Physicians recommends that patients with chronic low back pain start with non-pharmacologic treatments, and it names low-level laser therapy on that list alongside exercise, spinal manipulation, acupuncture, and others.
Two important qualifiers:
- The ACP rated the evidence behind laser therapy as low quality, meaning effects were small to moderate and more research would sharpen the picture.
- The guideline doesn't suggest light instead of other care. It sits in the same category as exercise and manual therapy — tools you combine.
Low back pain is the most common reason we see people at Body In Gear, and it's a global problem. The World Health Organization reports 619 million people had low back pain in 2020, making it the leading cause of disability worldwide.
Does red light therapy help neck pain?
This is one of the better-studied areas. A meta-analysis in The Lancet pooled 16 randomized controlled trials with 820 patients:
- In acute neck pain, patients were 69% more likely to improve with laser therapy than placebo.
- In chronic neck pain, patients were about four times more likely to report improvement.
- Across 11 trials using a 100-point pain scale, pain dropped by about 20 points on average, with relief lasting up to 22 weeks after treatment ended in chronic cases.
For perspective, a 20-point drop on a 100-point scale is a change most people notice in daily life.
Does red light therapy help knee pain and arthritis?
The most rigorous recent analysis is a 2019 BMJ Open meta-analysis of 22 placebo-controlled trials covering 1,063 people with knee osteoarthritis. When trials used the doses recommended by the World Association for Laser Therapy:
- Pain dropped by about 19 points (on a 100-point scale) more than placebo by the end of treatment.
- The effect grew to about 23 points during follow-up 2–12 weeks after treatment ended.
- Disability scores also improved.
The authors note that low-level laser therapy is still not recommended in major knee osteoarthritis guidelines — largely because earlier reviews mixed together trials that used effective and ineffective doses. Their analysis suggests dose is the deciding factor.
That's the honest summary for joint pain: the right dose appears to help; the wrong dose looks like nothing.
How does red light reduce joint and back pain?
Red and near-infrared light are absorbed by mitochondria in your cells, which increases cellular energy and shifts the local chemistry away from inflammation. Hamblin's 2017 review describes reductions in inflammatory signaling and a shift in immune cells toward repair.
For chronic pain, that matters in three ways:
- Less inflammatory irritation of joint linings, tendons, and muscle.
- Better-fueled tissue repair in areas with poor circulation.
- Calmer pain signaling, which can make movement and manual therapy more tolerable.
For back pain specifically, near-infrared wavelengths (roughly 780–1,100 nm) are usually the priority because they reach deeper into muscle and connective tissue than visible red light.
Who is a good candidate for red light therapy for pain?
Based on the research and our clinical experience, people most likely to benefit include those with:
- Chronic low back or neck pain with a soft tissue component — tight, guarded, tender muscles
- Knee osteoarthritis or other joint pain where inflammation flares with activity
- Tendon irritation such as tennis elbow or overuse pain around a joint
- Pain that limits exercise, where calming symptoms makes it possible to keep moving
- A preference for non-pharmaceutical options, or a desire to avoid or delay injections and surgery
When is red light therapy not the right choice?
Red light isn't a fit for every pain problem. It's the wrong first step when pain comes from:
- A fracture, infection, or serious structural problem needing medical care
- Severe nerve compression with weakness, numbness, or loss of bladder/bowel control (seek care immediately)
- Advanced joint damage where the mechanics, not inflammation, are driving pain
It also shouldn't be applied over certain areas without medical clearance — for example, over active cancer or the abdomen during pregnancy.
Why red light works better with soft tissue therapy
Here's the part most red light marketing skips: if a restricted muscle or a stuck layer of fascia is pulling on a joint or compressing a nerve, light can calm the irritation — but it won't release the restriction.
That's why our approach at Body In Gear pairs red light with hands-on soft tissue work. In many chronic back and joint cases, the pain generator is a combination of inflamed tissue and mechanical restriction. Light addresses the first; myofascial release, medical massage, and manual adhesion technique address the second. We break down that combination in red light therapy + soft tissue therapy.
How fast does red light therapy work for chronic pain?
Some people feel less pain within the first few sessions. In the research, though, the bigger and more durable effects showed up after a full course — and, notably, often continued improving for weeks after treatment ended, as in the knee osteoarthritis data. We cover timelines in how many red light therapy sessions do you need?
Related: What red light therapy is and how it works · Myofascial release for chronic neck and back pain · Red Light Therapy hub
Frequently asked questions
Is red light therapy good for arthritis? For knee osteoarthritis, a 2019 meta-analysis of 22 trials found significant pain reduction compared with placebo when recommended doses were used. Evidence for other joints is more limited.
Can red light therapy help a herniated disc? It may reduce surrounding inflammation and muscle guarding, but it won't change the disc itself. Disc-related pain with nerve symptoms should be evaluated by a medical provider.
Is red light therapy better than pain medication? It's a different tool, not a direct swap. It has a low side-effect profile and is listed as a non-drug first option for chronic low back pain, but it works best combined with other care.
Does insurance cover red light therapy? Coverage varies widely and is often limited. Ask the clinic about current options and pricing before starting.
Can I use a home device for back pain? Some people do, but consumer devices vary in power and wavelength accuracy, and dose matters a lot. A clinical evaluation helps you know whether light is the right tool at all.
Living with back or joint pain that won't let go? Book an evaluation at Body In Gear in Palatine. We'll find the root cause and tell you whether red light therapy belongs in your plan.
Medical disclaimer: This article is for educational purposes only and is not medical advice. Seek prompt medical attention for pain with numbness, weakness, fever, unexplained weight loss, or changes in bladder or bowel control.
About the author
Zach Mayfield, LMT is the owner of Body In Gear in Palatine, IL, a clinic focused on root-cause, non-pharmaceutical pain resolution through myofascial release, manual adhesion technique, and medical massage.
Clinically reviewed by Darshan Patel, PT, DPT, a Doctor of Physical Therapy at Body In Gear.
References
- Lucas JW, Sohi I. Chronic pain and high-impact chronic pain in U.S. adults, 2023. NCHS Data Brief No. 518. CDC; 2024. https://www.cdc.gov/nchs/products/databriefs/db518.htm
- Qaseem A, et al. Noninvasive treatments for acute, subacute, and chronic low back pain: a clinical practice guideline from the American College of Physicians. Ann Intern Med. 2017;166(7):514–530. https://www.acpjournals.org/doi/10.7326/M16-2367
- World Health Organization. Low back pain fact sheet. https://www.who.int/news-room/fact-sheets/detail/low-back-pain
- Chow RT, et al. Efficacy of low-level laser therapy in the management of neck pain: a systematic review and meta-analysis. Lancet. 2009;374(9705):1897–1908. https://pubmed.ncbi.nlm.nih.gov/19913903/
- Stausholm MB, et al. Efficacy of low-level laser therapy on pain and disability in knee osteoarthritis: systematic review and meta-analysis of randomised placebo-controlled trials. BMJ Open. 2019;9(10):e031142. https://pmc.ncbi.nlm.nih.gov/articles/PMC6830679/
- Hamblin MR. Mechanisms and applications of the anti-inflammatory effects of photobiomodulation. AIMS Biophys. 2017;4(3):337–361. https://pmc.ncbi.nlm.nih.gov/articles/PMC5523874/