Trigger Points and Myofascial Pain: Can Near-Infrared Light Really Help?

A Sore Spot That Refers Pain Elsewhere: What a Trigger Point Is

Run two fingers along the ridge where the neck meets the shoulder and every so often you find one spot, no bigger than a pea, knotted up tighter than the muscle around it. Hold steady pressure on that spot for three to five seconds, and the response often shows up nowhere near your fingers - a dull ache spreading into the temple, or a pressure behind the eye. People who chase that down at an orthopedic or rehabilitation clinic frequently walk out with a normal neck X-ray and a normal MRI, no disc problem, no bone abnormality, and no explanation for why the headache keeps returning. What is worth checking at that point is whether a trigger point has formed inside the muscle itself.

A trigger point is a localized knot: a cluster of muscle fibers stuck in ongoing contraction that never fully releases. What sets it apart from an ordinary tight spot is what happens when you press on it - the pain does not stay under your finger. It travels along a fairly predictable route to a site that can be several inches away. That traveling pain is called referred pain. A trigger point in the upper trapezius commonly refers to the temple as a tension-type headache; one in the subscapularis can send an ache from the back of the shoulder all the way down to the wrist. People experiencing this for the first time often book an eye exam or reach for headache medication before anyone connects the dots back to a knot in the neck or shoulder muscle.

This article works through why trigger points form, how to check for one with your own hands, a week-by-week management approach that includes near-infrared (NIR) light exposure, the mistakes that keep people stuck, and the point at which self-care should give way to a clinical visit. The emphasis throughout is less on NIR as a stand-alone fix - light alone rarely unwinds a contracted muscle fiber - and more on how it fits alongside manual pressure release and posture correction to produce a change you can actually feel.

Why a Knotted Muscle Sends Its Pain Signal Somewhere Else

The most widely cited explanation for how a trigger point forms is the integrated hypothesis. Repeatedly using the same muscle, or holding one posture for long stretches, leaves a subset of muscle fibers unable to fully release; they stay locked in ongoing contraction. Blood flow through that small knotted patch drops relative to the surrounding tissue, oxygen and nutrient delivery fall off, and pain- and inflammation-related substances - bradykinin, substance P, calcitonin gene-related peptide (CGRP) - accumulate on the spot. Sitting in that chemical mix, the local nociceptors become sensitized, which is why pressing on that exact patch produces a sharp, localized tenderness that the muscle right next to it does not share.

Jay Shah and colleagues, working out of the U.S. National Institutes of Health, published a study in the Journal of Applied Physiology in 2005 using microdialysis to sample tissue fluid directly from active trigger points. Compared with normal muscle and with symptom-free latent trigger points, the fluid drawn from active trigger points showed significantly higher concentrations of bradykinin, substance P, CGRP, and tumor necrosis factor-alpha (TNF-alpha). The study has real limits worth naming: it sampled a single muscle, the upper trapezius, in a small number of participants, and it was cross-sectional, so it cannot say whether the elevated chemical levels caused the pain or resulted from it. Even with those caveats, it gets cited often as evidence that a trigger point is not a vague sensation but a site of measurable local biochemical change.

Referred pain is best explained by how the spinal cord's dorsal horn handles incoming signals. Multiple muscles and skin regions that share a spinal segment funnel their pain signals into the same set of relay neurons before the brain ever processes them, so a signal originating in the trapezius and one originating in the skin near the temple can converge on shared circuitry. When the brain has to guess where a signal came from, it often gets the source wrong, attributing it to whichever pathway is more familiar or more densely represented rather than to the actual overworked muscle. That is the mechanism behind why pressing a spot in the neck lights up a headache pattern instead of neck pain, and why the referred pattern for a given muscle tends to stay consistent from one person to the next rather than random.

This is the point where near-infrared light exposure becomes relevant. Wavelengths in the 660-850nm range pass through skin and subcutaneous tissue and are understood to interact with cytochrome c oxidase inside cell mitochondria; a body of research reports that this interaction supports local blood flow and cellular metabolism in the exposed area. Given that reduced local blood flow is one of the contributing factors in trigger point formation described above, folding NIR exposure into a pain-management routine as a supporting measure is a theoretically defensible idea. That said, this remains a wellness-level supporting measure - there is no basis for claiming that NIR exposure by itself releases a contracted muscle fiber or treats a medical condition.

Related: NIR LED Protocol for Chronic Lower Back Pain

Localized trigger-point pain is a different picture from pain that shows up across the whole body. See also: Fibromyalgia and Photobiomodulation: A Whole-Body Pain Management Approach

Checking With Your Own Hands: A Practical Self-Assessment

Whether something is a trigger point is usually easier to gauge by touch than by imaging. Lay two or three fingers flat against the muscle, perpendicular to the fiber direction, and press slowly as if pushing the tissue aside - flat palpation. Where a trigger point sits, you will feel a band that is noticeably firmer than the tissue around it. Pressing steadily on that band sometimes produces a quick, visible twitch in the muscle, called a local twitch response, which clinicians use as one indicator when assessing a trigger point. What matters most is whether the pain stays confined to the spot under your finger or spreads out to a separate, fairly predictable location.

If three or more of the following apply, it is reasonable to suspect a myofascial trigger point and try the management approach described further down. If even one of the warning signs covered later applies to you, though, get evaluated before starting self-care.

• Pressing a specific spot sends pain somewhere else rather than keeping it under your finger
• You can feel a distinctly firm, band-like piece of tissue compared with the surrounding muscle
• Staying in the same position for more than 30 minutes makes the pain or stiffness worse
• Light stretching or pressing on the spot brings temporary relief
• The area feels like it does not generate as much strength as it used to when you use it
• Symptoms that seem unrelated to muscle, such as headache or dizziness, show up alongside it

The NIR Management Protocol: Week-by-Week Progression

In trigger point care, near-infrared exposure tends to produce a more noticeable effect when it is sequenced with manual pressure release and stretching rather than used on its own - that pattern shows up consistently in practice. The table below is a rough guide that shifts depending on how long the knot has been present; adjust it for your own pain level and whatever device you are using.

In week one, keep the intensity and duration on the low side and focus on watching how the tissue responds. Pushing a long exposure or firm pressure from day one can trigger a protective muscle guarding reflex that leaves you more sore the next day rather than less. Once pressing on the spot becomes tolerable, usually somewhere in weeks two to three, that is the signal to add ischemic compression or foam-roller release in earnest. From that point on, a common sequence is to run NIR exposure first for 10-15 minutes to soften the tissue, follow with manual pressure release, and finish with light static stretching. If the knot is still recurring past week four, the issue is less likely to be the NIR exposure or the pressure work itself and more likely the posture or repetitive movement causing it in the first place - that is the point to shift attention there.

A few concrete markers help decide when to move faster or slower than the table above. If pressing on the spot no longer produces a wince within the first week, it is reasonable to add the second daily session early rather than waiting out the full week. If soreness after a session lasts into the next day, that is a signal to drop back to once daily at the lower intensity rather than push through it. And if three consecutive sessions produce no change in how the area feels day to day, changing the wavelength mix or adding manual pressure work is a more useful adjustment than simply repeating the same routine longer.

Compared with a clinician-administered approach like dry needling, NIR exposure functions less as a way to directly eliminate pain and more as a supporting measure that makes the muscle easier to release. A 2013 meta-analysis by Kietrys and colleagues in the Journal of Orthopaedic & Sports Physical Therapy reported that dry needling for neck and shoulder trigger points produced a significant short-term reduction in pain compared with a sham procedure. The authors also flagged real limits: the number of included studies was small, and the number of sessions and the timing of follow-up assessment varied enough between studies that the finding is hard to generalize cleanly. If pain is severe, or if four weeks of self-care has not produced improvement, discussing options like this with a pain-management or rehabilitation physician is a reasonable next step. Numbness caused by nerve compression or damage calls for a different approach entirely, so it needs to be distinguished from ordinary trigger point pain. Learn more: LED Light Therapy for Neuropathic Pain

Fitting the Device Into a Routine

The part people get wrong most often with an NIR device is distance and angle. Rather than pressing the panel flush against the skin, holding it 5-10cm away and angling it so the light covers the whole treatment area evenly works better for managing a broader patch of muscle consistently. The trigger point itself might only be a few millimeters across, but exposing the surrounding muscle along with it, not just that single point, pairs better with the effect of manual release work. A curved area like the neck-shoulder ridge is more comfortable treated in two or three separate positions rather than holding one awkward angle for the whole session.

Sequencing affects how it feels, too. Applying firm pressure to a cold muscle right away can make the pain feel worse than it needs to, simply because the tissue is stiff. Warming the area with 10-15 minutes of NIR exposure first, then doing pressure release with a foam roller or massage ball, and finishing with static stretching to check range of motion, is reported by many users as noticeably more comfortable than pressing on cold tissue straight away. A generally recommended range is 10-15 minutes per area per day; if managing several areas, keep the combined daily total under 40 minutes and split it across sessions rather than running one long session. Check with a physician before starting if there is obvious heat or swelling right after an acute injury, if you are pregnant, or if you are taking a photosensitizing medication.

A few practical habits make a real difference over weeks of daily use. Wipe the panel's contact surface after each session rather than letting sweat or lotion residue build up on the lens, since a film across the light source cuts down how much actually reaches the skin. Keep a rough note of which position you used and for how long, especially in the first two weeks, so that if soreness increases you can tell whether it tracks with a specific angle or duration rather than guessing after the fact. Mild pink skin that fades within 20-30 minutes is a normal response to increased local blood flow; a rash, blistering, or skin that stays warm and red for hours is not, and is a reason to stop and check with a clinician before continuing.

Common Mistakes and How to Correct Them

The most common mistake is treating only the spot where the pain is actually felt - the referred-pain site - instead of the muscle that is causing it. Someone with an upper trapezius trigger point causing temple pain who only massages the temple gets short-term relief at best; the underlying knot stays put and the headache is back within days. The spot to manage is the one that feels like a firm band under your fingers, not the spot where the ache shows up.

The second mistake is misjudging intensity. Some people assume that pressing harder releases the knot faster and push through real pain to get there, but excessive pressure triggers the muscle's protective guarding reflex and can deepen the tension instead of easing it. A safe range is to keep pressure below about 6 or 7 out of 10 on a pain scale and to hold any one spot for no more than 90 seconds. If pain is worse the day after a pressure session than it was before, that is a sign to back off the intensity.

The third mistake is doing the NIR exposure and pressure release faithfully while leaving the underlying posture or habit untouched. If a forward-head posture in front of a monitor for eight-plus hours a day never changes, the upper trapezius goes right back into a guarded, contracted state as soon as the session ends. If relief keeps fading fast despite consistent sessions, the posture or repetitive motion behind it - not the release technique - is what needs attention first.

The fourth mistake is applying the same intensity to an acute injury and a long-standing chronic knot. Pushing firm pressure or a high-intensity NIR session onto tissue that is freshly injured and still swollen can slow recovery rather than speed it up. In the acute phase, starting at a low intensity, watching how the tissue responds, and raising the intensity gradually over several days is the safer order to follow.

A fifth pattern worth naming: stopping the whole routine the moment one session does not produce noticeable relief. Trigger points that took months of repetitive strain to form rarely resolve inside a single week, and abandoning the protocol after two or three days of modest change usually means restarting the acclimation period from zero later. Tracking whether the band under your fingers is gradually softening, even if the pain score itself moves slowly, is a better signal to watch than day-to-day pain alone.

When Self-Care Should Wait for a Clinical Visit

Most trigger point pain becomes noticeably more manageable within a few weeks using the approach described above. But in the situations below, self-care should wait and a clinical visit should come first.

See a doctor immediately if

• Sudden weakness or numbness appears: a neurological symptom that a simple muscle knot does not explain on its own
• A high fever accompanies rapidly worsening localized swelling: raises the possibility of an infectious myositis or similar condition
• Severe swelling and intense pain follow a fall or direct impact: possible muscle tear or fracture
• Neck or shoulder pain comes with chest pain: needs to be distinguished from a cardiac issue

See a doctor within two weeks if

• Nearly four weeks of consistent pressure release and NIR exposure has produced little to no change
• The area where referred pain spreads keeps expanding or intensifying
• Pain repeatedly wakes you up at night
• Weakness or numbness shows up that was not there before

Night pain deserves particular attention, because ordinary muscular pain usually eases with rest and a supported position, while pain that pushes through sleep regardless of position more often points to an inflammatory or structural process that needs its own workup. The same logic applies to unexplained weight loss or a low-grade fever that will not resolve: these are not things a tight trapezius produces on its own, and their presence alongside muscle pain is reason enough to move the timeline for a clinical visit forward rather than finishing out a few more weeks of self-care first.

Swelling and warmth right next to a joint, with pain that is especially sharp on movement, points toward a problem in the tissue around the joint rather than a trigger point, and deserves its own look. See also: NIR Care for Hip and Knee Bursitis

Desk Work, Exercise, and Sleep: Applying This Day to Day

For anyone who spends most of the day sitting at a desk, looking at something far away for 20 seconds and rolling the shoulders up and down once every 20 minutes measurably reduces the load on the upper trapezius. Setting the monitor slightly below eye level and adjusting the armrest so the elbow rests comfortably near 90 degrees cuts down on the hours the neck and shoulder muscles spend braced in tension. Fitting in even a short 10-15 minute NIR session with light stretching at lunch or before leaving the office tends to do more for preventing recurrence than a single hour-long massage crammed in on the weekend - that pattern shows up often in practice.

If tingling in the wrist or fingers accompanies the neck and shoulder pain, it is worth distinguishing whether that is referred pain from a neck or shoulder trigger point or a separate nerve issue at the wrist. See also: NIR LED Care for Carpal Tunnel Syndrome

Long drives create a very similar pattern: gripping the wheel with the shoulders hiked up loads the same upper trapezius and levator scapulae fibers that a hunched desk posture does. Dropping the seat slightly, keeping the elbows loosely bent instead of locked, and consciously lowering the shoulders every 20 minutes or so at a stoplight reduces that load. Carrying a bag or a child on the same side for long stretches builds asymmetric tension that mirrors whichever side does the carrying, and deliberately alternating sides through the day - switching a bag strap or which hip carries a child - keeps that load from concentrating in one spot day after day.

Before and after exercise call for a different order. Before a workout, keep it to a brief warm-up: light NIR exposure and gentle dynamic stretching, and skip firm pressure release. Starting a workout on a muscle that has just been pressed into submission and is not generating its usual strength can shift the load onto some other area instead. After a workout, the opposite applies - a fuller session of NIR exposure and foam-roller release focused on the areas that tend to knot up helps cut down on next-day soreness.

In bed, pillow height matters more than it seems like it should. A pillow that does not support the neck's natural curve keeps the upper trapezius and levator scapulae braced through the night. Adding a 10-minute NIR session to the neck and shoulders before sleep, along with light stretching, is something many users report helps reduce how tight the area feels by morning. That said, the effect varies a good deal from person to person and is not a guarantee - if pain persists or worsens, it is worth rechecking the warning signs covered earlier rather than continuing the same routine indefinitely.