Blog - Red and Near-Infrared Light Therapy for Shoulder Pain

George D.
January 29,2026

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Red and Near-Infrared Light Therapy for Shoulder Pain: A Comprehensive Guide to How It Works, What It Can Help, and What to Expect

Shoulder pain is one of the most common musculoskeletal complaints worldwide. Whether it develops from sports injuries, repetitive work, aging, poor posture, inflammation, or surgery, shoulder pain can significantly affect quality of life. Everyday activities such as lifting objects, reaching overhead, dressing, exercising, or even sleeping can become difficult and painful.

In recent years, red and near-infrared (NIR) light therapy—also known as photobiomodulation (PBM)—has gained increasing attention as a non-invasive approach for supporting tissue recovery, reducing pain, and improving function. Researchers have studied its effects on muscles, tendons, ligaments, joints, and inflammatory processes, making it a particularly interesting option for people dealing with shoulder problems.

This article explores how red and near-infrared light therapy works, which shoulder conditions may benefit, what the science says, and how it can be incorporated into a comprehensive recovery plan.

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Understanding Shoulder Pain

The shoulder is one of the most complex joints in the human body.

Unlike the hip, which prioritizes stability, the shoulder prioritizes mobility. This allows us to throw, lift, push, pull, and rotate our arms through an extensive range of motion. However, this mobility comes at a cost: the shoulder is vulnerable to injury and degeneration.

The shoulder consists of:

-Bones (humerus, scapula, clavicle)
-Rotator cuff muscles and tendons
-Ligaments
-Bursa sacs
-Joint capsule
-Cartilage
-Nerves
-Blood vessels

Pain can arise from any of these structures.

Common causes include:

-Rotator cuff injuries
-Tendinitis
-Bursitis
-Frozen shoulder
-Shoulder impingement
-Osteoarthritis
-Labral injuries
-Muscle strains
-Post-surgical inflammation
-Sports injuries
-Overuse syndromes

Many of these conditions share common biological processes:

-Inflammation
-Reduced circulation
-Cellular stress
-Tissue degeneration
-Delayed healing
-Pain signaling

-This is where red and near-infrared light therapy may provide support.

What is Red and Near-Infrared Light Therapy

Red and near-infrared light therapy uses specific wavelengths of light to stimulate biological processes inside cells.

The most commonly studied wavelengths include:

Red Light
-620–700 nm
-Commonly 630 nm, 660 nm

Near-Infrared Light
-700–1100 nm
-Commonly 810 nm, 830 nm, 850 nm, 940 nm

Unlike ultraviolet light, these wavelengths do not damage tissue when used appropriately.

Instead, they penetrate the skin and interact with cellular structures involved in energy production and repair.

This process is known as: Photobiomodulation (PBM)

How Red Light Therapy Works at the Cellular Level

To understand how light therapy may help shoulder pain, it helps to understand what happens inside cells.

Within nearly every cell are structures called mitochondria.

Mitochondria are often described as the body's "power plants" because they produce ATP (adenosine triphosphate), the primary energy currency of cells.

When tissues are injured or inflamed:

-ATP production often decreases
-Oxidative stress increases
-Cellular repair slows
-Inflammation persists

Red and near-infrared light appear to interact with an enzyme called:

Cytochrome c oxidase

This interaction may help:

-Increase ATP production
-Improve cellular energy availability
-Support tissue repair
-Enhance blood flow
-Modulate inflammatory processes
-Reduce oxidative stress

As a result, injured tissues may function more efficiently during the healing process.

Why Near-Infrared Light is Especially Important for Shoulder Pain?

One of the biggest differences between red light and near-infrared light is penetration depth.

Red Light

Generally penetrates:

-Skin
-Superficial tissues

Near-Infrared Light

Can reach:

-Deeper muscles
-Tendons
-Ligaments
-Joint structures

Because many shoulder problems involve deeper tissues such as the rotator cuff tendons, joint capsule, and surrounding musculature, near-infrared wavelengths are often considered particularly valuable.

Many therapeutic devices combine both red and near-infrared wavelengths to target multiple tissue depths simultaneously.

Shoulder Conditions That May Benefit from Light Therapy

1. Rotator Cuff Tendinitis

Rotator cuff tendinitis is one of the most common causes of shoulder pain.

The rotator cuff consists of four muscles and their tendons:

Supraspinatus
Infraspinatus
Teres minor
Subscapularis

These tendons can become irritated through:

Repetitive overhead movements
Sports
Weight training
Occupational strain
Age-related degeneration

Symptoms include:

Pain lifting the arm
Weakness
Night pain
Reduced mobility

Potential benefits of light therapy:

Reduction in inflammation
Improved circulation
Support for tendon healing
Pain reduction
Enhanced recovery between rehabilitation sessions

2. Rotator Cuff Tears

Rotator cuff tears range from small partial tears to complete ruptures.

While light therapy cannot reattach a completely torn tendon, it may help support surrounding tissues by:

Reducing inflammation
Improving local circulation
Supporting cellular repair mechanisms
Assisting post-surgical recovery
Reducing discomfort

For partial tears, light therapy may be useful as part of a broader rehabilitation program.

3. Shoulder Impingement Syndrome

Shoulder impingement occurs when tendons become compressed during shoulder movement.

Common symptoms include:

Pain reaching overhead
Pain while throwing
Pain during lifting
Clicking sensations

Inflammation often plays a significant role.

Light therapy may help by:

Modulating inflammatory responses
Reducing swelling
Supporting tissue recovery
Improving tolerance to rehabilitation exercises

4. Frozen Shoulder (Adhesive Capsulitis)

Frozen shoulder involves:

Joint capsule inflammation
Thickening of connective tissue
Progressive stiffness
Significant pain

Recovery can take months or even years.

Light therapy may help:

Reduce pain
Improve tissue metabolism
Support mobility work
Enhance blood flow to affected tissues

Although it is not a standalone cure, it may complement stretching and physical therapy.

5. Shoulder Bursitis

Bursae are fluid-filled sacs that reduce friction between tissues.

When inflamed, bursitis can cause:

Pain
Swelling
Tenderness
Restricted movement

Because light therapy may influence inflammatory pathways, some individuals report improvement in bursitis-related discomfort and function.

6. Osteoarthritis of the Shoulder

Shoulder osteoarthritis develops when cartilage gradually wears down.

Symptoms include:

Pain
Stiffness
Grinding sensations
Reduced range of motion

Light therapy cannot regenerate severely damaged cartilage.

However, it may help:

Reduce pain
Improve joint comfort
Support local circulation
Improve mobility

This may make daily activities easier.

7. Muscle Strains and Overuse Injuries

Athletes frequently develop shoulder pain from:

Swimming
Tennis
Baseball
Volleyball
Weightlifting
CrossFit

Light therapy may assist recovery by:

Supporting muscle repair
Reducing exercise-induced soreness
Improving circulation
Helping maintain training consistency

8. Post-Surgical Shoulder Recovery

Following shoulder surgery, healing tissues require:

Energy
Blood flow
Inflammation management

Research has investigated photobiomodulation as a supportive recovery modality after orthopedic procedures.

Potential benefits include:

Reduced postoperative discomfort
Improved tissue healing environment
Support for rehabilitation

Patients should always follow surgeon recommendations before beginning any therapy.

How Light Therapy May Reduce Shoulder Pain

Pain reduction appears to occur through several mechanisms.

Reduced Inflammation

Many shoulder conditions involve chronic inflammation.

Light therapy may influence inflammatory mediators and help normalize excessive inflammatory activity.

Improved Blood Flow

Enhanced microcirculation may increase:

Oxygen delivery
Nutrient transport
Waste removal

This can support tissue recovery.

Enhanced Cellular Energy

More ATP means cells may have greater resources available for repair processes.

Support for Tissue Regeneration

Research suggests photobiomodulation may influence:

Fibroblast activity
Collagen production
Tendon repair processes

These mechanisms are particularly relevant for tendons and ligaments.

Neurological Effects

Some studies suggest light therapy may alter pain signaling pathways, helping reduce pain perception.

Red light vs Near-Infrared Light for Shoulder Pain

A common question is:

"Should I use red light or near-infrared light?"

The answer is often both.

Red Light Benefits

Best for:

Skin
Superficial tissues
Surface inflammation

Near-Infrared Benefits

Best for:

Tendons
Muscles
Joint structures
Deep tissue recovery

Because shoulder tissues often lie beneath several layers of muscle and connective tissue, near-infrared wavelengths typically play a major role.

Combined devices are often preferred.

What Results Can People Expect?

Results vary depending on:

Diagnosis
-Severity
-Duration of symptoms
-Age
-Overall health
-Treatment consistency

Some people notice:

Within Days
-Reduced soreness
-Less stiffness
-Improved comfort

Within Weeks
-Improved range of motion
-Reduced pain during activities
-Better sleep

Over Several Months
-Improved function
-Enhanced rehabilitation outcomes
-Greater exercise tolerance

Chronic conditions often require longer-term consistency.

What Light Therapy Cannot Do?

It is important to have realistic expectations.

Light therapy is not a miracle cure.

It cannot:

-Instantly repair a fully torn tendon
-Replace surgery when surgery is necessary
-Correct severe structural deformities
-Eliminate every cause of shoulder pain

Safety Considerations

Red and near-infrared light therapy is generally 100% safe, considered low risk when appropriate devices are used according to manufacturer instructions.

However:
-Follow device guidelines.
-Consult a healthcare professional for persistent or severe shoulder pain.
-Obtain medical evaluation after traumatic injuries.
-Seek urgent care for sudden weakness, deformity, or inability to move the arm.

Who May Benefit Most?

Light therapy may be particularly appealing for individuals who:

-Have chronic shoulder pain
-Want a non-invasive option
-Are recovering from overuse injuries
-Are participating in physical therapy
-Want to support exercise recovery
-Prefer drug-free wellness approaches

Athletes, office workers, manual laborers, and older adults may all potentially benefit depending on the underlying condition.

The Bottom Line

Red and near-infrared light therapy represents a promising tool for supporting shoulder health and recovery. By helping improve cellular energy production, circulation, and inflammatory regulation, photobiomodulation may assist the body's natural healing processes and help reduce pain associated with a variety of shoulder conditions.

People commonly use light therapy for rotator cuff tendinitis, shoulder impingement, bursitis, frozen shoulder, muscle strains, osteoarthritis-related discomfort, and post-surgical recovery support. While it is not a replacement for proper diagnosis or necessary medical treatment, it can be a valuable addition to a comprehensive shoulder rehabilitation program.

As research continues to grow, red and near-infrared light therapy is becoming an increasingly recognized option for individuals seeking a non-invasive way to support healing, improve function, and reduce shoulder pain.