How the Sternocleidomastoid (SCM) Muscle Can Worsen Post-Concussion Symptoms in Kansas City Patients

How the Sternocleidomastoid (SCM) Muscle Can Worsen Post-Concussion Symptoms in Kansas City Patients

If you're still feeling dizzy, foggy, or sensitive to motion long after a concussion or car accident, the problem might not be “just in your head.” In fact, one of the most overlooked sources of post-concussion symptoms is a tight, irritated neck muscle called the sternocleidomastoid — or SCM.

At our Kansas City auto injury clinic, Dr. Lance Stevenson, DC helps patients recover from persistent post-concussion syndrome (PCS) by identifying hidden musculoskeletal contributors like SCM dysfunction that interfere with the brain’s healing.

What Is the SCM Muscle?

The sternocleidomastoid (SCM) is a large, rope-like muscle that runs from:

• The base of the skull (mastoid process)

• Down to the collarbone (clavicle) and sternum

You have one SCM on each side of your neck. These muscles:

• Turn and tilt the head

• Assist with neck flexion and posture

• Play a role in head stabilization and coordination

• Are rich in proprioceptors, sending info to the brain about head position

But after a concussion, whiplash, or car accident, the SCM can become tight, overactive, or inflamed — and that’s where problems begin.

How SCM Dysfunction Triggers Post-Concussion Symptoms

When the SCM becomes dysfunctional, it can create a domino effect on your nervous system, leading to:

🔁 Dizziness & Disequilibrium

Tight SCMs can send confusing proprioceptive signals to the brainstem, conflicting with input from your vestibular (inner ear) and visual systems. This mismatch can cause:

• Dizziness when turning your head

• Motion sensitivity in crowds or cars

• Feeling unsteady or “off” when walking

💢 Headaches and Neck Pain

SCM trigger points refer pain to the forehead, behind the eyes, or around the ears, mimicking tension or migraine headaches.

👁️ Visual Disturbances

Because the SCM affects head-eye coordination, dysfunction can lead to:

• Eye strain or visual fatigue

• Difficulty tracking moving objects

• Blurry vision during motion

• Trouble reading or using screens

🤢 Nausea and Brain Fog

The SCM is also associated with autonomic symptoms, which may include:

• Nausea

• Fatigue

• Feeling “foggy” or mentally drained

• Difficulty focusing in visually stimulating environments

What Causes SCM Dysfunction After a Concussion?

SCM issues are especially common in Kansas City patients with:

• Whiplash from car accidents

• Falls or sports injuries

• Poor posture (especially tech neck)

• Overuse during compensation for visual/vestibular problems

• Holding the head rigid to avoid motion-triggered dizziness

In short, the SCM often gets overloaded trying to “protect” the injured brain — but it ends up creating new problems instead.

How We Treat SCM Dysfunction in Kansas City

At our clinic, Dr. Lance Stevenson, DC performs a thorough evaluation of the cervical spine, proprioceptive function, and visual-vestibular coordination to identify whether the SCM is contributing to your symptoms.

Treatment may include:

✅ Manual release of the SCM and surrounding fascia
✅ Trigger point therapy to reduce pain referral
✅ Cervical spine mobilization to restore proper movement and alignment
✅ Proprioceptive retraining to reduce sensory mismatch
✅ Head-eye coordination exercises to restore normal reflexes
✅ Postural correction and screen-use ergonomics

Because the SCM connects multiple systems — neck, eyes, vestibular, and autonomic — we coordinate care with a comprehensive post-concussion rehab approach.

Get Relief from Persistent Post-Concussion Symptoms

If you’re still struggling with dizziness, headaches, or visual overload — and no one has addressed your SCM or neck muscles — you may be missing a critical piece of your recovery.

At our Kansas City clinic, Dr. Lance Stevenson, DC helps patients from Shawnee, Overland Park, Lee’s Summit, and across the metro find relief from post-concussion syndrome by addressing whole-body integration — including the muscles of the neck.

Call 816-226-7476 today to schedule a detailed evaluation and find out if your SCM is sabotaging your recovery.

Disclaimer: This content is for general educational purposes only and does not constitute medical or legal advice. Reading this content does not establish a doctor–patient relationship. Always consult a qualified healthcare provider for evaluation and treatment of injuries, and seek legal counsel for insurance or legal matters.

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