# Which neck muscles cause pain, and what each one does

> Four muscle groups produce most neck pain: upper trapezius, levator scapulae, sternocleidomastoid and the suboccipitals. Where each one hurts and what overloads it.

Category: Muscles & Recovery  
Written and fact-checked by Dalkir Studio Editorial Team  
Published: 2026-07-12 · Updated: 2026-08-04  
Language: en  

Canonical: https://neckly.app/learn/neckMuscles

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## Which muscles actually cause neck pain?

Four groups account for most of it. The upper trapezius across the top of the shoulder, the levator scapulae running from the neck to the shoulder blade, the sternocleidomastoid down the front and side, and the suboccipitals at the very base of the skull. Knowing which one is complaining tells you what you have been doing to it.[^cc-neck-pain]

## Where does each one hurt?

The location of the ache is a reasonably reliable guide, because each muscle refers pain in a characteristic pattern.

| Muscle | Where you feel it | Usually overloaded by |
| --- | --- | --- |
| Upper trapezius | Top of the shoulder, up the side of the neck, sometimes to the temple | Stress, raised armrests, carrying bags |
| Levator scapulae | Sharp point at the top inner corner of the shoulder blade | Sustained head rotation, sleeping awkwardly |
| Sternocleidomastoid | Front and side of the neck; can refer to the ear, jaw and behind the eye | Forward head posture, holding a phone with your shoulder |
| Suboccipitals | Base of the skull, spreading over the back of the head | Looking down, then tipping the eyes up to see |
| Deep neck flexors | Rarely ache — they go quiet instead | Disuse; weakness lets the others overwork |
| Scalenes | Side of the neck, can refer down the arm | Laboured breathing, forward head posture |

## What is the upper trapezius doing?

It lifts and stabilises the shoulder girdle, and it is the muscle that shrugs. It is also the body's most reliable stress meter: under pressure the shoulders rise, and the upper trapezius holds them there for hours.[^cc-trapezius]

When it aches across the top of both shoulders symmetrically, look at stress and armrest height before you look at anything else.

## What is the levator scapulae doing?

It runs from the upper cervical vertebrae to the top inner corner of the shoulder blade, and it both elevates the shoulder blade and helps rotate the head. The sharp, specific point of pain people press with a thumb at the top of the shoulder blade is almost always this muscle.

It gets overloaded by sustained rotation — a monitor placed off to one side, a phone held between ear and shoulder, or a night spent face-down.

## What is the sternocleidomastoid doing?

It is the prominent rope you can see running from behind the ear to the collarbone when you turn your head. It rotates and tilts the head, and it works hard whenever the head is held forward of the shoulders.[^cc-scm]

It is worth knowing about because its referred pain is deceptive: it commonly produces pain around the ear, the jaw and behind the eye, and people spend a long time investigating those before anyone looks at the neck.

## What about the deep neck flexors?

These are the small muscles at the front of the cervical spine — longus colli and longus capitis. They do not usually hurt. They simply stop working properly.

Their job is to hold the head stacked over the shoulders, and when they weaken, the larger superficial muscles take over a job they are not designed for. That is why a neck that constantly feels tight is very often a neck that is weak rather than short. It is also why chin tucks appear in nearly every evidence-based neck programme.[^cochrane-exercise]

## So should I stretch or strengthen?

Both, but strengthening is the part most people skip and the part with better evidence behind it. Stretching the muscles that feel tight gives short-term relief. Strengthening the deep neck flexors and the muscles between the shoulder blades changes how long you can hold a position before anything starts to ache.[^cochrane-exercise]

A reasonable rule: stretch what feels tight to make the session comfortable, then spend the majority of your time strengthening what has gone quiet.

## When is muscle pain not muscle pain?

Muscular neck pain is dull, position-dependent, and stays in the neck and shoulder region. Pain that travels below the elbow, or comes with numbness, tingling or weakness, is a nerve pattern rather than a muscular one and needs assessment before you start exercising it.[^mp-neck]

## Sources

1. [Cleveland Clinic — Trapezius Muscle](https://my.clevelandclinic.org/health/body/21563-trapezius-muscle) — Cleveland Clinic
2. [Cleveland Clinic — Sternocleidomastoid Muscle](https://my.clevelandclinic.org/health/body/23286-sternocleidomastoid-muscle) — Cleveland Clinic
3. [Cleveland Clinic — Neck Pain](https://my.clevelandclinic.org/health/diseases/21179-neck-pain) — Cleveland Clinic
4. [MedlinePlus — Neck Injuries and Disorders](https://medlineplus.gov/neckinjuriesanddisorders.html) — MedlinePlus
5. [Cochrane — Exercises for mechanical neck disorders](https://www.cochrane.org/CD004250/BACK_exercises-mechanical-neck-disorders) — Cochrane