Red Light Therapy for Muscle Pain: Soreness, Knots and Home Use
Red light therapy for muscle pain has its best support for two common problems: the soreness that peaks a few days after hard exercise, and tender knots in the neck and shoulders. In pooled trials, soreness was lower than with placebo at 72 and 96 hours, and light eased upper trapezius pain, with a larger effect when combined with exercise. Below: soreness, timing, knots, desk tension, trial settings, cramps, warning signs and panel set-up.
Key takeaways
- A 2025 meta-analysis found muscle soreness lower than with placebo at 72 and 96 hours when red or near-infrared light was applied to the worked muscle. Tsou, 2025
- A 2022 review of 17 studies with 944 patients found that light eased upper trapezius muscle pain, with a larger effect when light was combined with exercise. Alayat, 2022
- In a sham-controlled trial of 40 adults, 10 minutes of 830 nm LED light on sore thigh muscles raised the pressure needed to cause pain at 48, 72 and 96 hours. Chang, 2021
- A 2009 Lancet review of 16 trials with 820 patients found neck pain 19.86 mm lower on a 100 mm scale with laser light than with placebo. Chow, 2009
Does red light therapy for muscle pain work?
For soreness after exercise and for tender knots in the upper back and neck, the trials lean positive. The effects are moderate, and light works best as one part of a routine that includes movement, stretching and rest.
The evidence differs by type of muscle pain. The trials applied red and near-infrared light, mostly 630 to 950 nm, to the skin over the sore muscle.
| Type of muscle pain | Closest evidence | What it found |
|---|---|---|
| Soreness 1 to 3 days after exercise | 2025 meta-analysis, 14 studies | Soreness lower than placebo at 72 and 96 hours |
| Knots in the neck and shoulders | 2022 meta-analysis, 17 studies, 944 patients | Less pain; larger effect with exercise |
| Neck and upper back tension | 2009 Lancet review, 16 trials, 820 patients | Pain 19.86 mm lower on a 100 mm scale |
| Widespread pain and tender points | Fibromyalgia trials | See our fibromyalgia guide |
| Cramps | NHS self-care advice | Stretching and massage come first |
Normal soreness after exercise starts 1 to 3 days after a workout. It rarely lasts more than 5 days, and a week or more may point to a strain. Cleveland Clinic
Can red light therapy ease muscle soreness two days after a hard workout?
Yes, moderately: in a 2025 meta-analysis, soreness was lower than with placebo at 72 and 96 hours when light was applied to the worked muscle after exercise. Strength also recovered better, at 24 and 48 hours.
Of 14 controlled studies that met the review's criteria, 4 could be pooled. Tsou, 2025 Light from 660 to 950 nm went on the biceps, thighs, hamstrings or calves. The authors concluded that light "may serve as an effective intervention for managing DOMS", the abbreviation for delayed onset muscle soreness. The pooled trials were small, so the result is promising rather than proven. Our summary of the research on light and muscle recovery covers the same review.
Two LED trials show the effect on single muscle groups:
- Thighs: 40 adults had 830 nm LED light or sham on six points over the front of the thigh for 10 minutes after hard exercise. Chang, 2021 The light group tolerated more pressure before it hurt at 48, 72 and 96 hours.
- Upper arms: in a double-blind trial of 27 adults, 660 and 880 nm LED light on the biceps eased soreness at 48 hours more than sham or no treatment. Douris, 2006
The thigh trial authors read this as pain relief rather than faster repair. That is the core of the case for red light therapy for muscle soreness: it may take the edge off the ache while the muscle recovers at its own pace.
Should you use red light before or after a workout to reduce soreness?
Before, if you can manage it, with a session after also supported for soreness. Either way, keep it close to the workout and on the muscles you are training.
A 2018 review of 39 trials with 861 participants found that light from 655 to 950 nm improved time to exhaustion and repetitions compared with placebo. Vanin, 2018 The authors rated the evidence quality as very low to moderate.
In a 2022 trial, 28 men had 630 nm LED, 940 nm LED or placebo before 100 drop jumps. Padoin, 2022 A blood marker of muscle damage was lower at 72 hours with 940 nm than with placebo, and jump height recovered better with both colours. Soreness ratings were similar across the groups.
See our guide to red light therapy before or after a workout for a weekly plan, and our page for athletes for match days.
Can red light help knots in your neck and shoulders?
The evidence here is encouraging: a 2022 meta-analysis of 17 studies with 944 patients found less upper trapezius pain with light alone, and a larger effect when light was combined with exercise. Light also raised the pressure the muscle could take before it hurt.
The upper trapezius runs from the base of the skull across the top of each shoulder, and tender spots there are the classic sign of myofascial pain. Alayat, 2022 The review rated its evidence low to medium certainty.
A 2024 placebo-controlled trial followed 60 people with upper trapezius trigger points. Kocabal, 2024 Everyone had hot packs, nerve stimulation, stretching and home exercise. The light group also had 830 nm laser for 30 seconds on each of the 4 most painful points, 10 sessions over 2 weeks.
Pain was lower in the light group at the end of treatment and one month later, and pressure tolerance was higher than with placebo.
A 2023 review of 10 trials in myofascial pain found that 6 reported less pain than placebo right after treatment. Fagundes, 2023 Its authors wrote that light "seems to be a resource that decreases pain" in this condition.
Does red light work better alongside stretching or exercise?
The trials point that way: light plus exercise had the larger effect in the 2022 review, and adding light to stretching beat stretching alone in a 62-person trial. Light belongs inside a stretching and movement routine, not in place of it.
In that trial, people with an active trigger point in the neck or upper back had stretching with or without laser light. Hakgüder, 2003 Average pain fell from 7.54 to 3.06 out of 10 with light and stretching. With stretching alone, it fell from 7.03 to 5.19.
Mayo Clinic lists gentle stretches, massage and gentle exercise among the treatments for myofascial pain. Mayo Clinic For soreness after exercise, Cleveland Clinic suggests:
- Light movement: a short walk rather than full rest.
- Cold or heat: cold may reduce pain, and heat may ease stiffness.
- Massage or foam rolling: with gentle stretching. Cleveland Clinic
Red light sits alongside these as one more option.
Can red light ease neck and upper back tension from desk work?
The closest evidence comes from neck pain trials: a 2009 Lancet review of 16 trials with 820 patients found pain 19.86 mm lower on a 100 mm scale than with placebo. In chronic neck pain, effects were seen up to 22 weeks after treatment.
Side effects were mild and similar to placebo. Chow, 2009 A 2013 review found moderate quality evidence that light "may be beneficial for chronic neck pain/function/QoL". Gross, 2013 These trials used clinic lasers and covered neck pain broadly, not only muscle tension.
Pair light with regular breaks and a screen at eye level. See our guides to red light therapy for the neck and back pain.
Do LED panels help sore muscles, or only clinic lasers?
Most trials used clinic lasers or mixed laser and LED clusters, but the LED trials point the same way, with fewer and smaller studies. In all of them, light went on the skin over the muscle.
The LED examples are the thigh, upper arm and jump trials above. A trial probe touches a few small points, while a panel lights a whole thigh or the top of the back at once.
What settings did the muscle pain trials use?
Soreness trials gave one session, or daily sessions for up to 5 days, of red or near-infrared light on the worked muscle, lasting 80 seconds to 10 minutes. Trigger point trials gave about 10 short sessions over 2 weeks, a few minutes or less per point.
| Study | Muscle pain | Light | Dose or time | Sessions per week | Weeks |
|---|---|---|---|---|---|
| Chang, 2021 | Thigh soreness | 830 nm LED | 10 minutes over 6 points | 1 session after exercise | Single session |
| Douris, 2006 | Upper arm soreness | 660 and 880 nm LED | 80 seconds per point, 2 points | Daily | 5 days |
| Padoin, 2022 | Muscle damage after jumps | 630 or 940 nm LED | 4.6 J/cm² | 1 session before exercise | Single session |
| Kocabal, 2024 | Upper trapezius trigger points | 830 nm laser | 30 seconds on each of 4 points | 5 | 2 |
| Gür, 2004 | Myofascial pain | 904 nm laser | 3 minutes per point | 5 (weekdays) | 2 |
| Rayegani, 2011 | Myofascial pain | 880 or 905 nm laser | 2 minutes per point | 5 | 2 |
| Ilbuldu, 2004 | Myofascial pain | 632.8 nm red laser | 2 J per point | 3 | 4 (12 sessions) |
The three myofascial trials at the bottom come from the 2023 review. Fagundes, 2023 The pattern for home use: red and near-infrared together, on the sore muscle, in short sessions.
Can red light help with night cramps or muscle aches on a statin?
Light is not a cramp remedy: the NHS advice is to stretch or massage the muscle during a cramp and to do calf stretches several times a day. Muscle aches that start after a new medicine, especially a statin, need a doctor before anything else.
A leg cramp usually lasts from a few seconds to about 10 minutes, and the muscle can stay sore for up to a day. NHS Some people use a short panel session for that leftover ache.
The NHS lists statins and diuretics among the causes of cramps. Mayo Clinic advises seeing a doctor for muscle pain after starting or increasing a medicine, "especially statins". Mayo Clinic Never stop or change a prescribed medicine on your own.
Some medicines, including some anti-inflammatory painkillers, can make skin more sensitive to light. Our precautions rule out use with photosensitising medication, so if you take any medicine, check with your pharmacist or doctor before using the panel.
Which muscle pains need a doctor before a light?
Get urgent care for muscle pain with dark or brown urine, severe swelling or marked weakness, especially after extreme exercise. See a doctor first for pain with a fever, rash or tick bite, or pain that is not improving after a week.
- Dark urine: with muscle pain, swelling or weakness, it needs urgent medical attention. healthdirect
- Fever: Mayo Clinic lists "a high fever and stiff neck" with muscle pain as an emergency. Mayo Clinic
- Soreness that will not settle: pain lasting over a week, sharp and constant, or stopping you moving a body part. Cleveland Clinic
- Longer-term pain: beyond 4 to 6 weeks, or with numbness, tingling or weakness in the arms or legs. NHS Hampshire and Isle of Wight
- A sudden sharp pain: a pull or tear during exercise needs a doctor or physiotherapist.
How do you use the Kivorla panel for sore muscles?
Place the panel 12 inches from a broad area such as the thighs or back, or 6 inches from a smaller muscle group such as a calf, a forearm or one side of the neck. Run the red and near-infrared channels for 10 to 15 minutes per area, with the goggles on.
The 9-Spectrum Red Light Therapy Panel carries 480, 590, 630, 660, 670, 810, 830, 850 and 1060 nm, each dimmable from 1 to 100% with the controller. Its 630 to 850 nm channels sit inside the range the muscle trials used.
- Position: hang it on a door or wall with the included door hook, pulley, hanging cables and screws, or stand it upright on the floor. For the neck and shoulders, hang it at neck level and sit side-on or with your back to it, never facing it.
- Channels: red and near-infrared on; 480 and 590 nm off for muscle sessions.
- Timer: 10 to 15 minutes per area. If no time is set, the panel stops at 5 minutes.
- Soreness: a session close to the workout on the muscles you trained. On leg day, the front and back of the thighs are two sessions.
- Knots and tension: 2 to 4 sessions a week, each followed by your stretches, with a pain score out of 10 in a log. Judge it after about a month.
- Heat: the surface stays at or below 40°C; if skin feels hot, dim the near-infrared.
- Spacing: at least 6 hours between 30-minute sessions.
The trials gave small doses at a few points. To stay closer to that range, start around 5 minutes and build up, turn the channels down from 100%, or step back to 12 inches.
Use bare, clean skin, since clothing blocks the light. Keep the goggles on and your eyes closed, and never look into the panel. The red light therapy mask is a full-face shell for the face, so muscle sessions use the panel.
Do not use the panel if you are pregnant, breastfeeding or preparing for pregnancy, or have seizures triggered by light, a thyroid condition or thyroid medication. It is also ruled out with sunburn on the body in the past 2 weeks, broken skin on the area, or Fitzpatrick skin type V or VI.
Read the precautions before ordering. Standard shipping to the US, UK and Germany is free. Under our return and refund policy, returns are accepted within 30 days: an unopened device with its seals intact is refunded less a 10% restocking fee, and an opened device that is undamaged and complete is refunded less 20%.
Kivorla devices are general wellness devices, not medical devices, and are not intended to treat muscle injuries or medical conditions. See a doctor or physiotherapist for a sudden sharp pain, dark urine or pain that is getting worse.