However, neck and shoulder pain often comes from a spot separate from the hurt area.
People chase Neck and shoulder pain by rubbing a shoulder or icing a headache, while the real source sits unseen.
Muscles refer pain in reasonably consistent patterns. Those patterns have been mapped in detail, and knowing them is one of the more useful things a manual therapist brings to an assessment.
Here are the six that account for a large share of what walks through the door.
A note on the science first, because honesty matters here. The mechanism behind referred muscle pain is still debated, and the etiology of mechanical neck pain is considered multifactorial rather than settled. What is reasonably well established is that these referral patterns are clinically consistent and useful. In one study of office and manual workers, the combination of referred pain from these points reproduced each participant’s overall clinical pain area. So treat this as a practical map for assessment, not a complete explanation of pain.
1. Upper Trapezius
Where you feel it: Up the side of the neck, behind the ear, into the temple, and sometimes behind the eye. It’s a common source of the ache people describe as a tension headache.
Where it actually is: The band of muscle running from your neck to the point of your shoulder.
What loads it: Sustained shoulder elevation — a desk that’s too high, a mouse too far away, a heavy bag on one shoulder, cradling a phone. Also stress, which is where a lot of people unconsciously hold tension.
Why it matters: Active trigger points in the upper trapezius are among the most prevalent findings in people with neck pain, and this muscle has one of the largest referred pain areas of those studied.
2. Levator Scapulae
Where you feel it: The corner where your neck meets your shoulder blade, often with a distinctive inability to turn your head fully to that side. People describe it as a crick.
Where it actually is: Running from the upper neck down to the top inner corner of the shoulder blade.
What loads it: Sleeping awkwardly, prolonged head rotation — a monitor off to one side, a passenger seat conversation, a habitual phone position.
Why it matters: This muscle is one of the most commonly involved in mechanical neck pain, and the restricted rotation it produces is frequently mistaken for a joint problem.
3. Infraspinatus
This one surprises people the most.
Where you feel it: Deep in the front of the shoulder — and often down the outside of the arm. It can feel exactly like a joint problem, or like something is wrong inside the shoulder itself.
Where it actually is: On the back of your shoulder blade.
What loads it: Overhead work, repeated reaching, throwing, sleeping on that side, and carrying.
Why it matters: Infraspinatus is among the muscles with the largest referred pain areas studied, and it’s one of the most prevalent findings in neck and shoulder pain. People routinely have this treated as a rotator cuff joint problem when the muscle at the back is where the symptom originates.
4. The Scalenes
Where you feel it: This is the one that mimics nerve problems. Referral can travel down the front and back of the shoulder, down the arm, and into the hand — sometimes into specific fingers.
Where it actually is: The side and front of your neck, deep beneath the surface.
What loads it: Here’s the important part, and it’s the subject of the companion article: the scalenes are accessory breathing muscles. Anyone breathing predominantly through the upper chest recruits them thousands of times a day, on top of whatever else they’re doing.
Also carrying, coughing, and sustained forward head positions.
Why it matters: The scalenes have one of the largest referred pain areas of the muscles studied, and because that referral runs into the arm and hand, this pattern is frequently mistaken for a pinched nerve.
An important caution: arm and hand symptoms genuinely can come from a nerve root in the neck, and that needs distinguishing rather than assuming. Progressive weakness, numbness in a defined pattern, or worsening symptoms warrant medical assessment rather than soft tissue work.
5. Sternocleidomastoid
Where you feel it: The face, the ear, behind the eye, the forehead, the top of the head, and sometimes the throat. It can also produce dizziness and a sense of visual disturbance.
Where it actually is: The prominent rope of muscle running from behind your ear to your collarbone.
What loads it: Forward head positions, looking up for extended periods, whiplash-type events, and — again — upper chest breathing.
Why it matters: Because almost nobody with facial pain, ear pain, or an odd sense of unsteadiness thinks to look at a neck muscle, and these presentations often bounce between dental, ENT, and general medical appointments first.
6. Pectoralis Major
Where you feel it: The front of the chest, the front of the shoulder, and down the inner arm.
Where it actually is: The chest.
What loads it: Sustained forward positions, desk work, pushing activities, and carrying.
Why it matters: It has one of the largest referred pain areas studied. And chest pain from a muscle is only a reasonable conclusion after cardiac causes have been ruled out — which is a medical judgment, not one to make yourself.
The Test That Actually Matters
Here’s the distinction that makes this clinically useful rather than a party trick.
In the research, a trigger point is considered active when pressing it produces referred pain the person recognizes as their familiar symptom. It’s considered latent when the referred pain is produced but isn’t recognized as what they’ve been experiencing.
That recognition is the whole point. Plenty of people have tender spots that reproduce nothing meaningful — latent points are about as common in people without neck pain as in people with it. What distinguishes a relevant finding is that it reproduces your pain.
So the useful question during an assessment isn’t “is that tender?” It’s “is that your pain?” — and it’s worth answering honestly rather than politely.
Why This Changes the Plan
If your shoulder pain is being referred from the back of your shoulder blade, treating the front of the shoulder achieves little.
If your headaches are being referred from the side of your neck, headache medication manages the symptom without touching the source.
If your arm symptoms are coming from the front of your neck, no amount of shoulder work will resolve them.
The value of a referral map isn’t that it explains everything. It’s that it directs attention to places nobody has examined.
What Good Treatment Looks Like
Clinical practice guidelines for neck pain recommend manual therapy combined with exercise, rather than hands-on work alone. That combination matters — soft tissue work addresses what’s accumulated, and exercise and load management stop it rebuilding.
Worth knowing about the evidence honestly: no single approach has been established as definitively superior for managing these presentations, and some commonly offered modalities have fared poorly in review — conventional ultrasound, for instance, has been found no more effective than placebo for trigger point pain in the neck and upper back.
When to See a Physician Rather Than a Therapist
Seek emergency care for chest pain or pressure, breathlessness, sweating, nausea, or pain radiating into the jaw or left arm. Also for sudden severe headache, facial droop, slurred speech, or one-sided weakness.
Seek prompt medical assessment for progressive weakness in an arm or hand; clumsiness with fine tasks or a change in your walking; numbness in both hands; neck pain after significant trauma; fever, unexplained weight loss, or night sweats; a history of cancer with new neck pain; severe unrelenting night pain; or dizziness with visual disturbance, difficulty swallowing, or slurred speech.
Let’s Find Out Where Yours Is Coming From
The most useful hour is the one spent working out which muscle reproduces your actual symptom.
Castrell Neuromuscular Therapy offers a free discovery visit at no cost and no obligation. You’ll get a thorough assessment of the neck, shoulder, and surrounding musculature, a clear explanation of where your pain is likely originating, and a plan combining hands-on work with the movement and load changes that keep it away.
If your presentation needs medical assessment, we’ll tell you plainly.