Red Light Therapy for Frozen Shoulder: What the Trials Show
Red light therapy for frozen shoulder has its best support as an add-on to exercise: in a placebo-controlled trial of 63 people, 810 nm laser light plus exercise left pain at 32 out of 100 after 4 weeks, against 51 with placebo light plus exercise. The trials used clinic lasers on the skin, alongside stretching or physiotherapy. Below: the studies, laser versus LED, stages, trial settings, diabetes and thyroid, injections and surgery, warning signs, and panel set-up.
Key takeaways
- In a 63-person trial, 810 nm laser plus exercise left pain at 32 on a 0 to 100 scale after 4 weeks, against 51 with placebo laser plus exercise. Cochrane review, 2014
- In a 40-person trial in the same Cochrane review, 16 of 20 people counted as a treatment success after 6 days of low-level laser, against 2 of 20 with placebo. Cochrane review, 2014
- In a 2025 trial of 60 people, the group that had low-level laser added to hot packs and exercise made the largest gains in a range-of-motion score at 12 weeks. Erdinc, 2025
- A 2025 review of 650 nm laser studies for frozen shoulder counted 8 mild skin reactions among 283 participants and no serious side effects. Hassan, 2025
- People with diabetes are about 5 times more likely to have frozen shoulder, according to a 2016 meta-analysis of 18 studies. Zreik, 2016
Does red light therapy for frozen shoulder help?
Small laser trials suggest it can ease pain and help daily function when added to exercise. The Cochrane review concluded that laser plus exercise "may be more effective than exercise alone" for pain up to four weeks and function up to four months.
Frozen shoulder, or adhesive capsulitis, happens when the connective tissue around the joint thickens and tightens. Mayo Clinic Our red light therapy for shoulder pain guide covers the main laser trial in detail. The table below adds the newer studies.
| Study | Who | What was tested | Main finding |
|---|---|---|---|
| Stergioulas, 2008 | 63 adults | 810 nm laser or placebo laser, both with exercise, for 8 weeks | Pain 32 vs 51 out of 100 at 4 weeks; arm raised to the side 79 vs 70 degrees |
| Taverna, 1990 (in Cochrane) | 40 people | Low-level laser or placebo for 6 days | Treatment success in 16 of 20 vs 2 of 20 |
| Ezzati, 2022 | 52 adults | Light added to routine physiotherapy, 10 sessions | Greater fall in pain by the 1-month follow-up |
| Erdinc, 2025 | 60 adults | Laser (15 sessions) or shockwave added to hot pack and exercise, or a control group | Both eased pain at week 3; laser group gained most in movement and function scores at week 12 |
| Ordahan, 2023 | 20 adults in the low-level laser group | 904 nm laser with supervised stretching five times a week for 3 weeks | Pain fell from 7.42 to 4.73 on a 10-point scale |
The 63-person trial was double-blind for patients and assessors and scored 8 out of 10 on the PEDro quality scale. Stergioulas, 2008 Neither trial in the Cochrane review reported side effects.
In the 52-person trial, pain fell further by the 1-month check. Ezzati, 2022 In the 2025 trial, both added treatments "positively affected pain and range of motion". Erdinc, 2025
These are small trials. The 2025 review calls light an add-on and says exercise and manual therapy should "remain primary in any comprehensive treatment plan". Hassan, 2025
Is low level laser therapy for frozen shoulder the same as red light therapy?
They are two ways of delivering the same kind of light: a clinic laser treats a few small points for seconds each, while a home panel covers the whole shoulder with LEDs from a short distance. The frozen shoulder trials used lasers on the skin, so the closest evidence for a panel comes from those laser studies.
Both are forms of photobiomodulation. Most frozen shoulder trials used near-infrared light at 810 or 904 nm; the 2025 review gathered 650 nm red laser studies.
Our guide to cold laser therapy vs red light therapy explains how the two formats differ.
Is red light most useful in the freezing, frozen or thawing stage?
Light was studied mainly for pain and daily function, so it fits best in the painful months rather than as a way to restore movement. Stretching matched to each stage stays the core of care throughout.
Stage lengths are from Mayo Clinic (other sources vary); the exercise focus is from a rehabilitation guideline. HSS guideline
- Freezing: about 2 to 9 months. Gentle range-of-motion exercises and pendulum swings, avoiding sudden or painful movements.
- Frozen: about 4 to 12 months. Low load, long duration stretching.
- Thawing: about 5 to 24 months. Longer stretches into resistance, then strengthening.
The NHS notes that pain "can be worse at night and disturb sleep". NHS It also suggests a heat pack or a hot water bottle wrapped in a tea towel for up to 20 minutes at a time. Heat and light work by different means, and both can sit in the same routine.
Mayo Clinic says frozen shoulder usually improves over one to three years. A clinical guideline reports that the other shoulder is later affected in 5% to 34% of people. JOSPT guideline, 2013
Can red light loosen a frozen shoulder or break up adhesions?
Light has been studied for pain and function, not for breaking up adhesions or stretching the capsule. Movement comes back with stretching and time, and light sits alongside that work.
In the 63-person trial, people raised the arm out to the side to 79 degrees at 4 weeks, against 70 with placebo. Cochrane review, 2014
In the 2025 trial, the laser group had the largest gains in a range-of-motion score at 12 weeks. Erdinc, 2025 Both trials paired light with exercise, and the stretches stay central.
Should you use red light before or after frozen shoulder stretches?
Before is the order used in the 2023 trial, where supervised stretching followed each laser session. A light session, then your physio's exercises, keeps the two together without changing your programme.
In that trial, everyone did 25 minutes of stretching and assisted exercises five times a week for 3 weeks. Ordahan, 2023 The laser group had light three times a week on top.
The NHS advises gentle home exercises and physiotherapy, usually for at least 6 weeks, and warns against making up strenuous exercises. NHS
What settings did the frozen shoulder light trials use, and for how long?
Most trials used near-infrared laser at 810 to 904 nm on 8 or 9 points around the joint, for 20 to 50 seconds per point. Sessions ran 1 to 3 times a week for 3 to 8 weeks, usually with exercise.
| Study | Light | Points and time | Sessions | Weeks | Alongside |
|---|---|---|---|---|---|
| Stergioulas, 2008 (placebo) | 810 nm laser, continuous, 60 mW | 8 points, 30 seconds each, 1.8 J per point | Twice a week for 4 weeks, then weekly; 12 in all | 8 | Exercise |
| Ordahan, 2023 | 904 nm laser, 240 mW | 9 points, 50 seconds each, 3 J/cm² per point | 3 a week | 3 | Supervised stretching, 5 days a week |
| Ip and Fu, 2015 (no control group) | 810 nm laser, continuous, 50 mW | 6 joint points for 20 seconds, 2 shoulder blade points for 30 seconds | 3 a week | 8 | After painkillers and physio had not helped |
| Erdinc, 2025 (controlled) | Low-level laser | Not given in the summary | 15 in all | 3 | Hot pack and exercise |
| Hassan, 2025 (review) | 650 nm laser | Most often 10 to 20 minutes, 4 to 8 J/cm² | 2 to 5 a week | 3 to 8 | Wider care |
Every study held the laser on or very close to the skin over the shoulder.
Courses ran from 9 to 24 sessions, and the main trial found its pain difference at 4 weeks, so judge a home routine at three to four weeks. Our guide to how long red light therapy takes to work covers timelines more widely.
Laser joules per point do not convert into a panel session; the pattern carries over: near-infrared light, several sides of the joint, exercise every time.
Can you use red light for frozen shoulder with diabetes or a thyroid condition?
With diabetes, check with your GP or diabetes team before starting. With a thyroid condition or thyroid medication, our precautions rule out using Kivorla devices at all.
A 2016 meta-analysis of 18 studies found diabetes in 30% of people with frozen shoulder, and frozen shoulder in 13.4% of people with diabetes. Zreik, 2016 The 2013 guideline links diabetes with slower recovery.
In a small study of 40 older adults with type 2 diabetes, laser three times a week for 8 weeks, with exercise, improved all four shoulder movements measured. Soliman, 2014
Mayo Clinic lists an overactive or underactive thyroid among the risk factors. If that applies to you, our devices are not suitable.
The NHS suggests paracetamol and then anti-inflammatory painkillers such as ibuprofen for frozen shoulder pain. Our precautions rule out use with photosensitising medication, so anyone taking a medicine should check with their pharmacist or doctor before using the device.
Can you use red light after an injection, hydrodilatation or shoulder release surgery?
Ask the doctor who gave the injection or did the procedure first, and keep light off any puncture site until the skin has fully closed. After manipulation under anaesthesia or arthroscopic release, wait until the wounds have closed and your surgeon agrees.
For early pain, a clinical guideline rates a steroid injection combined with stretching highly for the first 4 to 6 weeks, and whether to have one is your GP's decision. JOSPT guideline, 2013
Never use light over stitches, staples or an open wound. Our guide to red light therapy after surgery covers timing in more detail.
Where should the light go on a frozen shoulder: front, back or armpit?
Trials lit points all round the joint: the top under the bony tip, the front of the capsule, the underside near the armpit, and the back of the capsule and shoulder blade. With a panel, light the front and side first, then turn to light the back.
A study of 35 older adults listed its targets in detail. Ip and Fu, 2015
- Top: under the bony tip of the shoulder.
- Front: the front of the capsule, where the biceps tendon attaches.
- Underside: the lower pouch of the capsule, toward the armpit.
- Back: the back of the capsule and two shoulder blade points.
A 45-person trial found that adding laser and ultrasound to the armpit region, with a muscle relaxation technique and exercise, gave the best gains in pain and movement. Elhafez, 2016 A panel cannot reach fully into the armpit, but lifting the arm a little, as comfort allows, opens up the side of the joint.
Which shoulder symptoms need a doctor before trying light?
See a GP or physio first to confirm it is frozen shoulder, as a stiff, painful shoulder can also be arthritis or a rotator cuff problem. Get urgent help for sudden or severe pain, pain after a fall, an arm you cannot move, or a fever.
The key sign is reduced passive outward rotation of the arm. NHS North East London, 2025
- Call 999: chest pain that spreads to the arms, neck or jaw. NHS
- Urgent GP or 111: sudden or very bad pain, an arm you cannot move, a changed shape or bad swelling, lasting numbness, pain after a fall, or feeling feverish. NHS
- Checks first: a lump, red skin with fever, or a past history of cancer.
- GP visit: shoulder pain that is worse, or no better after 2 weeks.
How do you use a Kivorla panel for frozen shoulder?
Hang the panel so its centre is at shoulder height, put the goggles on, and sit side-on with the stiff shoulder about 6 inches away. Run the near-infrared channels for 10 to 15 minutes per area, turn to light the back of the shoulder, then do your physio stretches.
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%. Its 810 nm channel matches the wavelength used in the main placebo-controlled trial. Our mask is a face device and does not reach the shoulder.
- Position: hang it on a door or wall with the included door hook, pulley, hanging cables and screws (see setting up a panel at home).
- Distance: about 6 inches side-on for the shoulder joint. Step back to 12 inches to light the wider shoulder blade and upper back, or to soften the light.
- Eyes: goggles on before you switch on, eyes closed, and never face the panel or look into it. See our guide to red light therapy goggles.
- Channels: lead with 810, 830 and 850 nm and dim the others. Use continuous light, as in the trials.
- Timer: 10 to 15 minutes per area, on bare, clean, dry skin. If no time is set, the panel stops at 5 minutes.
- How often: three to five times a week, with at least 6 hours between 30-minute sessions.
- Comfort: the surface stays at or below 40°C, so it should feel warm, never hot. Stop if the skin becomes irritated.
- Log: pain out of 10 before, after and the next morning, how high the arm lifts, and how often night pain wakes you.
The trials gave small doses at a few points. To stay closer to that range, start with a shorter timer (from 1 minute), dim the channels or step back to 12 inches, then build up.
Do not use the panel if you are pregnant, breastfeeding or preparing for pregnancy, have epilepsy or light-triggered seizures, have broken skin on the area, had sunburn on the body in the past 2 weeks, or have Fitzpatrick skin type V or VI. Light sits alongside your physio programme and your doctor's plan, never instead of them.
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 frozen shoulder. See a GP or physiotherapist to confirm the diagnosis, and keep the exercises and treatment they advise.