Red Light Therapy for Pain Relief: How It Works, What It Helps, and What to Expect

By: Dr. Shane Kurth, D.C., BCN

Updated April 2026

Editor’s note: This guide was written by the clinical team at Radiant Results, a red light therapy clinic in Sandy, Utah. Pain relief is one of the most common reasons people come to us — chronic joint aches, post-workout soreness, lingering back pain. This post explains the mechanism behind why red light therapy helps, which pain types respond best, and what a realistic program looks like.

Key Takeaways

Red light therapy reduces pain through three connected mechanisms: stimulating cellular energy production (ATP), reducing inflammatory signaling in tissue, and improving local blood flow and circulation.
Near-infrared light (~810–850nm) is the primary wavelength for pain relief — it penetrates 2–5cm into tissue, reaching muscles, joints, and nerves that surface-level red light can’t access.
It works best for musculoskeletal pain — joint aches, muscle soreness, tendon issues, and post-activity recovery. The evidence for nerve-related pain is promising but less consistent.
Results are cumulative. Acute soreness may respond within 1–3 weeks; chronic joint conditions typically need 6–10 weeks of consistent sessions (3–5 per week) before significant improvement.
Red light therapy works best as a complement to existing care — not a replacement for physical therapy, medication, or medical evaluation when those are needed.

Why Red Light Therapy Reduces Pain

Most pain — whether from a sore muscle, a stiff joint, or chronic inflammation — has three contributing factors: damaged or stressed tissue that needs repair, inflammatory signals that sensitize pain receptors, and poor local circulation that slows healing. Red light therapy addresses all three through a process called photobiomodulation.

Cellular Energy and Tissue Repair

Inside every cell are mitochondria, which produce ATP — the energy that powers all cellular functions including repair and recovery. When red and near-infrared light reach tissue, they’re absorbed by an enzyme in the mitochondria called cytochrome c oxidase, which increases ATP production.

More cellular energy means:

Damaged muscle, tendon, and joint tissue can repair more efficiently
Nerve cells involved in pain signaling function with less sensitization
Fibroblasts produce more collagen for connective tissue repair

This is the foundation of why red light therapy helps pain — not a temporary numbing effect, but support for the actual repair process.

Reducing Inflammation

Inflammation is the body’s first-line response to tissue damage, but persistent inflammation is what drives chronic pain. Red light therapy has been shown to shift the local inflammatory environment in treated tissue — reducing pro-inflammatory signals (including compounds like IL-6 and TNF-α) while increasing anti-inflammatory mediators.

In practical terms, this means:

Less swelling and fluid buildup around joints and muscles
Reduced activation of pain receptors sensitized by inflammatory chemicals
Faster resolution of the acute inflammatory phase after exercise or injury

For a patient-focused overview of how these mechanisms play out with common inflammatory conditions, red light therapy for inflammation covers the practical side of what consistent sessions tend to produce. A research review published in PMC (Mechanisms and Pathways of Pain Photobiomodulation) documents the cellular mechanisms through which photobiomodulation modulates inflammatory signaling, with evidence across multiple musculoskeletal conditions.

Improving Circulation

Red and near-infrared light stimulate the release of nitric oxide from blood vessel walls and mitochondria. Nitric oxide relaxes smooth muscle in blood vessels, increasing local blood flow to the treated area. For a deeper look at how this mechanism works, light therapy and nitric oxide covers the circulatory pathway in more detail.

Better circulation means:

More oxygen and nutrients delivered to repairing tissue
Faster clearance of metabolic waste products that contribute to soreness
Improved environment for collagen and connective tissue rebuilding

For chronic pain conditions where poor circulation contributes to tissue degeneration (as in some forms of joint degeneration), this circulatory effect is particularly relevant.

Harvard Health notes that photobiomodulation is being studied for pain and tissue healing, while acknowledging that results vary by condition and protocol. The Cleveland Clinic describes it as a treatment whose outcomes depend on how it’s applied — which is why session frequency, wavelength, and consistency matter more than most people realize.

Which Pain Conditions Respond Best

Not all pain responds equally to red light therapy. Here’s an honest breakdown of the applications with the strongest evidence and the clearest clinical rationale.

Joint Pain and Osteoarthritis

Strength of evidence: Strong for mild-to-moderate joint pain

Chronic joint pain — knees, hips, shoulders, hands — responds consistently to red light therapy in clinical studies. The mechanisms are well-matched: reduced inflammation around the joint, improved microcirculation in joint tissue, and cellular energy support for cartilage-maintaining cells (chondrocytes) that are notoriously slow to repair.

People with knee osteoarthritis, hip stiffness, and general joint aches often notice reduced stiffness and easier movement within 4–6 weeks of consistent sessions. Large joints (knee, hip, back) benefit most from full-body clinic beds that deliver sufficient power to penetrate deeper tissue. Smaller joints (fingers, wrists) can be addressed with targeted devices.

Realistic timeline: Noticeable improvement in stiffness and comfort within 3–6 weeks. Most significant change at 8–12 weeks.

Muscle Soreness and Recovery

Strength of evidence: Strong, particularly for delayed-onset muscle soreness (DOMS)

This is one of the most well-documented applications. Near-infrared light penetrates muscle tissue and supports the repair process after exercise-induced microtrauma. Studies consistently show reduced soreness scores and faster functional recovery with pre- or post-exercise red light therapy sessions.

Athletes and active adults use red light therapy both to speed recovery between training sessions and to manage cumulative soreness from physically demanding work. The effect is most noticeable when sessions are consistent — sporadic use doesn’t allow the anti-inflammatory benefits to accumulate.

Realistic timeline: Reduced next-day soreness often noticeable within the first 1–2 weeks of consistent use.

Back, Neck, and Shoulder Pain

Strength of evidence: Moderate-to-strong for musculoskeletal causes

Chronic low back pain, neck stiffness, and shoulder aches with a musculoskeletal origin (muscle tension, joint degeneration, tendon irritation) respond well to near-infrared therapy. Full-body red light therapy is particularly practical here — a single session treats the entire back and shoulder region simultaneously rather than requiring repositioning.

Important caveat: red light therapy addresses pain that has a tissue-level cause. Pain with a structural neurological origin (disc herniation with nerve compression, for example) needs medical evaluation first. Red light therapy can be a useful complement to physical therapy or chiropractic care for back pain, but it should not replace appropriate diagnosis.

Realistic timeline: 3–6 weeks for meaningful improvement in chronic musculoskeletal back and neck pain.

Tendon and Ligament Conditions

Strength of evidence: Moderate

Conditions like tennis elbow, Achilles tendinopathy, rotator cuff irritation, and plantar fasciitis involve slow-healing connective tissue that benefits from the collagen-stimulating and circulation-improving effects of near-infrared light. These conditions are notoriously stubborn because tendons and ligaments have poor blood supply — which is exactly where improved circulation from red light therapy is most valuable.

These applications require longer programs (often 8–12 weeks or more) because connective tissue healing is inherently slow regardless of the intervention.

Realistic timeline: Initial improvement in 4–6 weeks; full benefit typically at 10–16 weeks.

Strength of evidence: Promising but less consistent

Pain from peripheral neuropathy (including chemotherapy-induced neuropathy and diabetic neuropathy) and other nerve-related conditions has shown improvement in some clinical trials. The mechanism is plausible — near-infrared light can reach peripheral nerves and modulate nerve excitability — but individual response is more variable than for musculoskeletal applications.

People pursuing red light therapy for neuropathic pain should approach it as a complementary tool alongside prescribed treatment, not a standalone solution. Expect gradual change over weeks rather than rapid relief.

Realistic timeline: 6–10 weeks before meaningful assessment is possible.

Post-Surgical Recovery and Wound Healing

Strength of evidence: Moderate, with growing clinical use

Red light therapy is increasingly used in post-surgical rehabilitation settings. It supports fibroblast activity and collagen synthesis (relevant for wound healing), reduces post-operative inflammation, and may help decrease reliance on pain medication during recovery. Sessions are typically applied once wounds are closed and cleared by the surgical team.

Always confirm with your surgeon before using red light therapy over or near a surgical site.

What to Expect: Realistic Timelines

Condition	When People Typically Notice Change
Acute muscle soreness (DOMS)	Within 1–2 weeks of consistent sessions
Chronic joint pain (osteoarthritis)	3–6 weeks; most improvement at 8–12 weeks
Back and neck pain (musculoskeletal)	3–6 weeks with consistent attendance
Tendon conditions (tendinopathy)	6–10 weeks; full benefit at 10–16 weeks
Neuropathic pain	6–10 weeks; variable response
Post-surgical recovery	Case-dependent; typically 4–8 weeks

The single most important variable: consistency. Three to five sessions per week during an initial 6–8 week program is what the clinical research consistently points to. Once-a-week sessions rarely produce meaningful change for pain goals. Red light therapy before and after documentation shows how that kind of steady, session-over-session progress tends to look across a structured program.

Near-Infrared vs. Red Light for Pain

This distinction matters more for pain goals than for skin goals.

Red light (~630–660nm) penetrates primarily skin surface layers — relevant for surface inflammation, wound healing, and skin-level applications. For pain relief specifically, its role is secondary.

Near-infrared light (~810–850nm) penetrates 2–5cm into tissue — reaching muscles, joints, tendons, and peripheral nerves. This is the primary wavelength for pain relief applications. Any device or clinic you evaluate for pain goals should clearly use near-infrared wavelengths, not just visible red light.

Medical-grade full-body clinic beds that deliver both wavelengths simultaneously cover both the surface and deep tissue in a single session — practical for people dealing with both pain and skin concerns. The medical grade red light therapy guide covers what separates clinic-grade equipment from consumer devices and why that gap matters for deep tissue applications.

Clinic vs. At-Home Devices for Pain

At-home devices — panels, wearable wraps, handheld devices — can be genuinely useful for:

Single-joint pain (a knee wrap, a shoulder pad)
Supplemental use between clinic sessions
Mild muscle recovery support

Their limitations for pain goals: lower power output (most consumer devices fall well below clinic-grade irradiance), smaller coverage area (back pain typically requires covering a large region), and self-managed consistency. For a side-by-side breakdown of when clinic treatment makes more sense than home devices, the best red light therapy treatment guide walks through each goal type in detail.

Clinic treatment is more appropriate when:

Pain is widespread or affects multiple areas simultaneously
The condition is chronic and needs a structured program with measurable progress
Near-infrared depth is critical (joint degeneration, deep muscle involvement)
You want staff guidance on session frequency and protocol

The FDA has cleared certain photobiomodulation devices for specific pain indications including temporary relief of minor muscle and joint pain and increased local circulation. When evaluating any device, check its specific FDA clearance and indicated use — clearance for cosmetic skin applications doesn’t automatically extend to pain treatment.

Safety and Who Should Check With a Doctor First

Red light therapy is widely considered low-risk for most people when used correctly. Situations requiring healthcare provider consultation before starting:

Photosensitive medications — certain antibiotics, antifungals, NSAIDs, retinoids, and some psychiatric medications increase light sensitivity. Check with your prescriber.
Active malignancy — avoid direct treatment over known tumor sites until cleared by your oncologist.
Pregnancy — consult your healthcare provider; avoid direct application over the abdomen.
Active skin infections or open wounds — these need medical management before adding light therapy.
Uncontrolled thyroid disease — avoid direct neck area treatment without clinician guidance.
Implanted devices — people with pacemakers or other implanted electronic devices should consult their cardiologist.

Eye safety: Always follow the clinic’s eye protection guidance. Near-infrared light is invisible but can cause eye discomfort or damage with direct prolonged exposure. Provided eyewear should always be used.

Pain Relief at Radiant Results, Sandy Utah

If you’re in the Salt Lake Valley and dealing with chronic joint pain, persistent muscle soreness, back or neck stiffness, or recovery from injury, Radiant Results is at 870 East 9400 South, Unit 113, Sandy, UT 84094. We serve clients from Sandy, Draper, Murray, South Jordan, Cottonwood Heights, and throughout the Salt Lake area.

Our full-body medical-grade bed delivers both red and near-infrared wavelengths simultaneously, treating the entire body — back, hips, knees, shoulders — in a single 15-minute session. For clients combining pain relief goals with body contouring or skin rejuvenation, everything is addressed in one visit.

Our pain relief program is built around structured, consistent sessions with a clear plan — not random drop-in visits. You can also view client results to see how programs progress over time.

The $79 New Patient Special is a low-pressure way to try a session, describe your specific pain concerns, and decide whether a program makes sense for your situation. Call 801.980.0840 or book online.

Frequently Asked Questions

Does red light therapy actually reduce pain, or is it a placebo effect? The mechanism is well-documented at the cellular level — near-infrared light increases ATP production in mitochondria, reduces inflammatory cytokines in treated tissue, and stimulates nitric oxide release for improved circulation. These are measurable biological changes, not placebo. Clinical reviews and meta-analyses consistently show pain reduction for musculoskeletal conditions above placebo controls, though the magnitude varies by condition and protocol. A research review published in PMC documents these mechanisms in detail.

How quickly will I feel pain relief from red light therapy? It depends on the condition. Acute muscle soreness often responds within 1–2 weeks of consistent sessions. Chronic joint pain typically takes 3–6 weeks before noticeable improvement, with the most significant change at 8–12 weeks. Tendon conditions are the slowest — often 10–16 weeks. Single sessions rarely produce lasting change; the benefit is cumulative.

How often do I need sessions for pain relief? Clinical research consistently points to 3–5 sessions per week during an initial phase of 6–8 weeks. Once-a-week sessions are better than nothing but rarely produce meaningful improvement for chronic pain goals. After the initial program, 1–2 sessions per week maintains the benefit.

Can red light therapy replace physical therapy or medication for pain? No — it works best as a complement, not a replacement. For conditions requiring physical rehabilitation, medication, or medical evaluation, red light therapy supports the healing process alongside those interventions. It’s particularly useful for people who want to reduce reliance on over-the-counter pain medications or speed recovery between physical therapy sessions.

Is near-infrared light the same as red light therapy? Near-infrared light is a component of what’s broadly called “red light therapy.” The distinction matters for pain goals: visible red light (~630–660nm) primarily affects surface tissue; near-infrared (~810–850nm) penetrates 2–5cm into tissue, reaching muscles and joints. For pain applications, near-infrared is the more critical wavelength. Any device or clinic you consider for pain should clearly use near-infrared wavelengths.

Where can I try red light therapy for pain near Sandy, Utah? Radiant Results is at 870 East 9400 South, Unit 113, Sandy, UT 84094. Claim the $79 New Patient Special or call 801.980.0840.

Sources:

Author bio: Dr. Shane Kurth, D.C., BCN, is the co-owner of Radiant Results and a leading expert in full spectrum medical-grade light therapy and whole-body wellness. With a background in chiropractic care, chronic pain management, and advanced light-therapy applications, Dr. Kurth has dedicated his career to helping people achieve life-changing results through non-invasive, science-backed solutions.

His passion for healing and transformation is the foundation of Radiant Results — a clinic built to offer clients a safe, effective, and empowering path toward body confidence and optimal well-being.

Drawing from years of clinical experience and successful operational leadership at Apex Chiropractic in Colorado, Dr. Kurth helped develop the reproducible light-therapy protocol that powers Radiant Results today. This system has helped thousands of clients reduce stubborn body fat, tighten and rejuvenate their skin, and improve their health without surgery or downtime. At the heart of his work is a simple mission: to help people feel better in their bodies and live more radiant, fulfilling lives.