The most fascinating muscle in the human body

Dr. Janet Travell described the sternocleidomastoid (SCM) as "the most fascinating muscle in the body" — and for good reasons. It is the only muscle that simultaneously flexes and rotates the head, has two bellies (sternal and clavicular) with completely distinct referred pain patterns, and is capable of generating a surprising range of symptoms that seem to have nothing to do with the neck: dizziness, tinnitus, nausea, ear pain, orbital pain, and even balance disorders.

When a patient arrives with the triad "dizziness + tinnitus + neck pain" — especially after a period of intense stress, cervical trauma, or prolonged forward-head posture — trigger points in the SCM should be at the top of the diagnostic list. Treatment with dry needling and electroacupuncture at these points frequently resolves symptoms that labyrinth tests and audiometry cannot explain.

How the SCM generates dizziness, tinnitus, and vertigo

  1. SCM as proprioceptive receptor

    The SCM is rich in muscle spindles and contributes essential proprioceptive information to the vestibulocervical reflex — which integrates signals from the labyrinth with those from the neck to maintain balance. Trigger points alter this proprioceptive signaling, generating "false information" to the vestibular system.

  2. Accessory nerve and vascular compression

    The tensed SCM can compress the internal jugular vein and the internal carotid artery, reducing cerebrovascular flow. Additionally, the accessory nerve (XI cranial nerve) that innervates the SCM has connections with the vestibular nucleus — explaining the direct neural pathway to vestibular symptoms.

  3. Referred pain from the sternal belly to the ear

    The sternal belly of the SCM refers pain to the ipsilateral ear, deeply, simulating otitis or temporomandibular joint dysfunction. This periauricular pain, associated with referred tinnitus, frequently leads to multiple consultations with otolaryngologists without a diagnosis.

  4. Clavicular belly — dizziness and double vision

    The clavicular belly of the SCM has a unique reference pattern: it can generate dizziness, nausea, imbalance, and — rarely — transient diplopia (double vision). This pattern is frequently confused with vertebrobasilar insufficiency or central neurologic disturbance.

  5. Lateral pterygoids and tinnitus

    The lateral pterygoids, mastication muscles adjacent to the temporomandibular joint, have trigger points that refer to the ear and can generate or amplify tinnitus. In patients with tinnitus + bruxism + neck pain, treatment of the pterygoids with dry needling is frequently the missing piece.

Epidemiology of cervicogenic vestibular symptoms

Relevant share
OF CHRONIC DIZZINESS
may have cervicogenic origin as a primary or contributing cause — data from specialized otoneurology services suggest that this etiology is underdiagnosed
Important subtype
OF SUBJECTIVE TINNITUS
may have association with cervical trigger points and/or temporomandibular dysfunction — a somatosensory component potentially responsive to dry needling and medical acupuncture
Multiple
SPECIALISTS
it is common for patients with cervicogenic vertigo to consult neurologist, otolaryngologist, cardiologist, and psychiatrist before correct diagnosis
Improvement described
IN SERIES
of cervicogenic tinnitus and dizziness with medical acupuncture protocols focused on the SCM, scalenes, and suboccipitals — evidence predominantly observational, controlled trials in progress

Recognizing the cervical origin of symptoms

Critérios clínicos
08 itens

Cervicogenic dizziness and tinnitus \u2014 typical pattern

  1. 01

    Mild dizziness or vertigo associated with neck pain and stiffness

  2. 02

    Tinnitus that worsens in periods of cervical tension or stress

  3. 03

    Symptoms that worsen with cervical rotation or extension

  4. 04

    Periauricular pain (around the ear) without otologic alteration

  5. 05

    Sensation of imbalance when walking — "walking on clouds"

  6. 06

    Mild nausea associated with cervicogenic dizziness

  7. 07

    SCM painful and tense on bilateral or unilateral palpation

  8. 08

    Improvement of symptoms with heat or massage on the neck

Myths and facts about dizziness and tinnitus

Myth vs. Fact

MYTH

Tinnitus has no treatment

FACT

Tinnitus of sensorineural origin (cochlear damage, presbycusis) has limited treatment to habituation and sound therapy. But somatosensory tinnitus — associated with trigger points in the SCM, lateral pterygoids, and masticatory muscles — which represents a relevant fraction of cases, can respond to dry needling and medical acupuncture, according to observational clinical series. Correct diagnosis guides treatment.

MYTH

Chronic dizziness without neurologic cause is anxiety

FACT

Functional vestibular dizziness (formerly called "phobic dizziness") is a real diagnosis, but should be made after excluding structural causes — including cervicogenic. Trigger points in the SCM and cervical proprioceptive dysfunction generate real dizziness, measurable on posturography. Treating only anxiety without addressing the cervical component leaves the biomechanical cause unresolved.

MYTH

If the labyrinth test is normal, dizziness has no physical cause

FACT

Labyrinth tests (audiometry, vectoelectronystagmography, vestibular evoked myogenic potential) assess the labyrinth — not the cervical proprioceptive system. Cervicogenic dizziness from SCM trigger points has normal labyrinth tests by definition, because the cause is in the cervical muscle, not the inner ear.

The most neglected muscle in dizziness investigation

Treatment protocol

Screening and exclusion of serious causes
1st visit

Basic neurologic assessment (cerebellar signs, spontaneous nystagmus). If alert signs present, immediate referral. If prior labyrinth tests normal and cervicogenic pattern, proceed. Palpation of the SCM for symptom reproduction — confirms the diagnosis.

SCM dry needling
Sessions 1–4

Pinching technique: SCM isolated between thumb and index finger, needle inserted horizontally in the sternal belly (close to the sternum) and clavicular (middle portion). Twitch response frequently provokes a brief sensation of dizziness — expected and transient. Electroacupuncture 2 Hz.

Suboccipitals and scalenes
Sessions 3–6

Dry needling of the suboccipitals (GB-20, BL-10) for the occipital headache component. Treatment of the anterior and middle scalenes when they contribute to dizziness. For tinnitus associated with TMJ: dry needling of the pterygoids if indicated.

Cervicogenic vestibular rehabilitation
Sessions 7–10

Cervical stabilization exercises and proprioceptive training (fixed gaze with cervical movement, adapted Cawthorne-Cooksey exercises). Postural guidance: screen position, pillow appropriate for the neck, prevention of "forward head" posture.

Clinical pearl: the turtle posture

Frequently asked questions

FREQUENTLY ASKED QUESTIONS · 03

Frequently Asked Questions

For new or intense dizziness, especially with sudden hearing loss, nystagmus, or neurologic signs, otolaryngologic and neurologic investigation is a priority. For chronic dizziness with normal prior tests and a clearly cervicogenic pattern (association with neck pain, worsening with cervical movements), myofascial assessment can be initiated while complementary tests are performed.

Tinnitus from cochlear damage (noise exposure, presbycusis, ototoxic medications) has limited treatment. Medical acupuncture can offer partial symptomatic relief via central neuromodulation, but does not reverse cochlear damage. The greatest benefit is in tinnitus associated with cervical and TMJ dysfunction — where the cause is treatable. The physician evaluates each patient’s profile to define therapeutic potential.

Patients with cervicogenic dizziness and tinnitus frequently report partial improvement as early as the 2nd or 3rd session — especially dizziness, which tends to respond more quickly than tinnitus. Tinnitus may take 6–8 weeks for significant reduction. Response is individual and depends on the chronicity of the condition and perpetuating factors.