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Photobiomodulation – Effects, Uses & Therapy

Photobiomodulation (PBM) is a non-invasive light-based therapy using red or near-infrared light to stimulate healing, reduce pain, and promote tissue regeneration.

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Things worth knowing about "Photobiomodulation"

Photobiomodulation (PBM) is a non-invasive light-based therapy using red or near-infrared light to stimulate healing, reduce pain, and promote tissue regeneration.

What Is Photobiomodulation?

Photobiomodulation (PBM), also referred to as photobiomodulation therapy (PBMT) or low-level laser therapy (LLLT), is a non-invasive medical treatment that applies light in the red or near-infrared wavelength range (typically 600–1100 nm) to body tissues. Unlike thermal laser treatments, PBM does not generate significant heat and is therefore also known as cold laser therapy. It is widely used for pain relief, wound healing, inflammation reduction, and tissue regeneration.

Mechanism of Action

The biological effects of photobiomodulation are based on the absorption of light photons by specific molecules within cells, known as chromophores. The primary target molecule is cytochrome c oxidase, an enzyme found in the mitochondria – the energy-producing organelles of the cell.

Light photons are absorbed by cytochrome c oxidase, activating the mitochondrial respiratory chain.
This leads to increased production of adenosine triphosphate (ATP), the main energy currency of the cell.
Reactive oxygen species (ROS) are released in moderate amounts, acting as signaling molecules.
As a result, growth factors, anti-inflammatory cytokines, and cellular repair processes are activated.
Blood flow in the treated tissue is enhanced, improving the supply of oxygen and nutrients.

Clinical Applications

Photobiomodulation is applied across a wide range of medical specialties:

Pain Management

PBM is frequently used for both chronic and acute pain conditions, including back pain, joint pain, neck pain, and conditions such as fibromyalgia and arthritis. The therapy can reduce inflammation and alleviate nerve irritation.

Wound Healing and Dermatology

In dermatology and wound care, PBM promotes regeneration of skin and connective tissue. It is used for chronic non-healing wounds, pressure ulcers (decubitus), burns, and post-surgical recovery.

Sports Medicine and Rehabilitation

In sports medicine, PBM accelerates recovery from muscle exertion, reduces delayed onset muscle soreness (DOMS), and supports the healing of tendon and ligament injuries.

Neurology

Emerging research is exploring the use of PBM for neurological conditions such as Parkinson's disease, traumatic brain injury, and depression. Results are promising but further large-scale studies are needed.

Dentistry

In dentistry, PBM is used to treat oral mucositis (stomatitis), post-extraction pain, and temporomandibular joint (TMJ) disorders.

Treatment Procedure

The therapy is delivered using specialized laser or LED devices that emit light of a defined wavelength and energy onto the target tissue. Treatments are generally painless and last between 5 and 30 minutes depending on the indication. Multiple sessions are typically required to achieve therapeutic benefit. The precise dosage – measured in joules per square centimeter (J/cm²) – is critical to treatment outcomes.

Safety and Side Effects

Photobiomodulation is considered a very safe therapy with a low side effect profile. Known side effects include:

Temporary skin redness in the treated area
Mild tingling or warmth during the session
In rare cases, a temporary increase in symptoms at the beginning of treatment

The therapy is contraindicated for direct irradiation of tumor tissue, during pregnancy (direct abdominal irradiation), in photosensitive conditions, and over thyroid tissue in certain pre-existing conditions.

Scientific Evidence

The body of scientific evidence supporting photobiomodulation is steadily growing. Numerous clinical trials and systematic reviews confirm positive effects on pain, wound healing, and inflammation. The World Health Organization (WHO) and various professional medical societies recognize PBM as a complementary treatment option. However, large-scale randomized controlled trials are still needed for certain indications to standardize optimal treatment parameters.

References

Hamblin, M. R. (2017). Mechanisms and applications of the anti-inflammatory effects of photobiomodulation. AIMS Biophysics, 4(3), 337–361. https://doi.org/10.3934/biophy.2017.3.337
Chung, H. et al. (2012). The nuts and bolts of low-level laser (light) therapy. Annals of Biomedical Engineering, 40(2), 516–533. https://doi.org/10.1007/s10439-011-0454-7
Anders, J. J., Lanzafame, R. J., & Arany, P. R. (2015). Low-level light/laser therapy versus photobiomodulation therapy. Photomedicine and Laser Surgery, 33(4), 183–184. https://doi.org/10.1089/pho.2015.9848

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