Photobiomodulation (PBM) / Professionally Delivered Red/Near-Infrared Light Therapy

Overview

What It Is Photobiomodulation uses red or near-infrared light delivered by lasers or LEDs to support cellular energy production and modulate inflammation. In neurological applications the light is typically applied to the scalp or forehead. Sessions last 10–30 minutes and are often given several times per week.

How It Works Light at specific wavelengths is absorbed by mitochondrial enzymes, which may increase cellular energy (ATP) and influence inflammatory and signaling pathways. In injured or under-functioning brain tissue, this is hypothesized to support a metabolic environment more conducive to repair and adaptive plasticity. Human evidence is still emerging.

Conditions - Studied for: traumatic brain injury and cognitive symptoms (small trials and pilots). - Also explored for: other neurological and mood applications. - Note: Larger rigorous studies are still limited. Temporary headache or fatigue can occur; overall risk is very low.

How it is administered

In-clinic sessions in which red or near-infrared light is applied to the scalp or forehead. Sessions often last 10–30 minutes and may be given 2–3 times per week for a course of weeks. Home devices are also used in some protocols.

The NPA Treatment Database lists this treatment in connection with 10 condition records. A database relationship does not establish effectiveness, safety, or suitability for an individual.

These controlled question pages reference this treatment through stored condition relationships.

Symptoms connected in the NPA database

The current record associates this treatment with the following symptom information. This is not a claim that the treatment will improve these symptoms.

Cognition & Memory

confusion with time/place
Delayed cognitive skill development
difficulty concentrating
Difficulty concentrating (“brain fog”)
difficulty with familiar tasks
Difficulty with sequencing
indecisiveness
Later memory and thinking changes
memory complaints
Memory loss (especially recent events)
mental fog
mental fog during/after attacks
processing speed for written information
racing thoughts
Short-term memory issues
Short-term memory problems
slowed mental processing
slowed processing
slowed thinking
spatial neglect
trouble planning or problem-solving
working memory challenges
worry

Emotion & Behavior

anxiety
apathy
avoidance behaviors
avoidance of reading tasks
Depression
difficulty with regulation
emotional lability (uncontrollable laughing/crying)
Excessive fear or worry
feelings of worthlessness
Frustration
impulsivity
irritability
loss of interest/pleasure
lowered self-confidence
Mood and personality changes
mood changes
mood changes before or during attacks
mood swings
Persistent sadness
social withdrawal
Social-emotional delays
withdrawal from activities

Motor Control

Balance and coordination problems
balance and gait problems
Delayed gross or fine motor milestones
difficulty walking
guarding
Later-stage mobility and coordination decline
Minimal (occasional fine-motor or coordination differences)
muscle stiffness/spasticity
muscle tension
Occasional weakness or coordination changes during aura (rare subtypes)
One-sided weakness or paralysis
poor balance and coordination
reduced fine motor skills
Reduced mobility
Restlessness
rigidity/stiffness
slowed movement (bradykinesia)
slowed movements
Slowed movements or restlessness (psychomotor changes)
trembling
Tremor
weakness

Sensory & Pain

central post-stroke pain (burning, shooting pain, and sensitivity to touch, temperature)
Generally minimal primary sensory changes
headaches
heightened sensitivity
muscle aches
nausea
Numbness or altered sensation
numbness or tingling
Pain
Persistent headaches
Persistent pain (aching, burning, stabbing)
Physical sensations (heart racing, chest tightness, sweating)
reduced sense of smell
sensitivity to light/noise
sensitivity to light/sound/smell
sensory changes
Throbbing or pulsing head pain
tinnitus
Unexplained aches and pains
Variable sensory processing differences

Sleep & Fatigue

Excessive fatigue
fatigue
Insomnia or excessive sleepiness
Insomnia or hypersomnia
Mental fatigue from reading effort
post-attack exhaustion
profound fatigue and low energy
profound physical and mental fatigue
restlessness at night
sleep disruption
Sleep disruption due to pain
sleep disturbances
Sleep problems (including REM sleep behavior disorder)
Trouble falling or staying asleep
Variable sleep pattern issues

Visual & Auditory Processing

Blurred or double vision
Difficulty distinguishing letter/word shapes and sounds (core auditory-phonological and visual processing issues)
difficulty judging distances or recognizing objects
difficulty processing sounds
difficulty processing visual information
double vision
Heightened sensitivity to sensory input in some cases
light sensitivity
phonophobia (sound sensitivity)
Possible delays in visual-motor or auditory processing skills
Spatial and visual perception problems
Visual auras (flashes, zigzags, blind spots)
Visual field loss
Visual processing or spatial difficulties in some cases

Practical information

Insurance coverage

Rarely covered for TBI.

Cost information

$100–$300 per session; courses often $2,000–$6,000+.

Results and outcomes described in the source record

Some report benefits within a few sessions; more consistent changes often after 8–20 sessions.

Side effects and risks

Very low risk. Possible temporary headache or fatigue.

Research context in the NPA database

This section reproduces the current database's research summary and detail. Structured citation metadata has not been supplied, so it should not be read as an independently verified literature review.

Research summary

Evidence Level: Emerging

What the research shows: Small trials and pilot studies, especially in traumatic brain injury, report cognitive and symptom benefits. Larger rigorous studies are still limited.

Key takeaway: A low-risk light-based therapy being explored mainly for brain injury and some pain conditions; evidence is still developing.

Research detail

Overview Photobiomodulation uses red or near-infrared light delivered by lasers or LEDs to support cellular energy production (via mitochondrial cytochrome-c oxidase) and to modulate inflammation. In neurological applications the light is typically applied to the scalp or forehead. Sessions last 10–30 minutes and are often given two or three times per week for a course of weeks. Wavelength, power density, and placement are adjusted according to the clinical goal. Both clinic-based professional devices and home devices exist.

Evidence Base and Published Work • Small randomized controlled trials and pilot studies, especially in moderate traumatic brain injury (including Figueiro Longo et al., JAMA Network Open 2020), report cognitive and symptom benefits. • Pilot work by Naeser, Bogdanova and others, and systematic reviews note emerging but still limited rigorous evidence. • Key published work includes: – Figueiro Longo et al. (2020) and related small RCTs/pilot trials in moderate TBI. – Pilot work by Naeser and Bogdanova groups. – Systematic reviews noting emerging but still limited rigorous evidence. – Temporary headache or fatigue can occur; overall risk is very low. Evidence remains emerging.

Outcomes in small trials include cognitive and symptom benefits, especially in traumatic brain injury. Larger rigorous studies are still limited.

Questions to ask a provider

1. Is photobiomodulation appropriate for my cognitive or post-concussion symptoms, and what protocol (wavelength, dose, placement) do you use? 2. How many sessions are recommended, and over what timeframe? 3. What evidence exists for PBM in traumatic brain injury or cognitive symptoms, and what results are realistic? 4. Are there any risks or contraindications (e.g., photosensitivity, certain medications)? 5. Is this delivered only in clinic, or are home devices used, and what is the cost?

Website and contact information

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