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Atlas · Neck

Scalenes

The scalenes connect the side of the neck to the upper ribs and assist breathing and neck movement. Regional soreness can occur, but arm tingling, weakness, a cold or swollen hand, chest pain or breathlessness needs assessment beyond a muscle map. Care focuses on comfortable movement and restoring activity after nerve, vascular and respiratory causes have been considered.

Scalenes
Body region
Neck
Trigger points
3
documented in this muscle
Common symptoms
4
patterns cataloged
Contributors
4
Factors to assess

Muscle overview

Symptoms and first steps

Practical first steps

  • Avoid balls, massage guns, hooks or deep fingers above the clavicle or beneath the SCM.
  • Reduce a clearly provoking carry or overhead task temporarily, then rebuild it after assessment.
  • Choose relaxed, unforced breathing and gentle head movement; do not force large breaths or stretch into arm symptoms.

When to seek assessment

  • Chest pressure, new significant breathlessness, fainting or sudden neurological symptoms needs emergency assessment.
  • A suddenly swollen, discolored, cold or very painful arm/hand requires urgent assessment for vascular disease.
  • Progressive arm/hand weakness, persistent numbness or muscle wasting needs prompt medical assessment.

The brachial plexus and subclavian artery pass between anterior and middle scalenes; the phrenic nerve lies on anterior scalene. This anatomy makes deep supraclavicular pressure inappropriate, and does not establish thoracic outlet syndrome from tenderness.

Examination, palpation and treatment evidence

Illustrated overview

Scalenes

Blue highlights the muscle. Crosses mark representative trigger-point sites; shaded areas show possible referred pain. These examples do not correspond one-to-one with the numbered points below. Patterns vary and cannot diagnose the cause of pain.

Illustrated overview

Scalenes · Anatomy 1

Anatomical view of the illustrated muscle.

Open full-size image

Trigger points

1. TrP1

Location. Side of neck, deep to SCM

Trigger point map
Scalenes — Trigger point mapOpen full-size image

Shared muscle diagram; it may show several trigger points.

Referred pain map
Scalenes — Scalenes · Referred-pain pattern 1Open full-size image

Regional muscle reference; this is not an individual map of the selected numbered trigger point.

Pain referral. Lateral neck and shoulder; arm symptoms require a neurological assessment

Pain Pattern

  • Lateral neck
  • Shoulder region
  • Arm ache — nonspecific and subject to neural/vascular differential assessment

What This Pain Feels Like

Pain may change with head movement or sustained arm use; assess the whole cervical and shoulder region. An ache around the shoulder or upper back is nonspecific and may arise from muscle, joint or neural structures.

What Patients Report

  • Side-of-neck ache during carrying
  • Shoulder-region discomfort
  • Reduced tolerance for overhead tasks

What Makes It Worse

  • Carrying a load
  • Overhead reaching
  • A sustained arm position
Browse related exercises (18)

Symptoms patients report

Side-of-neck discomfort Pain may change with head movement or sustained arm use; assess the whole cervical and shoulder region.

Shoulder-region ache An ache around the shoulder or upper back is nonspecific and may arise from muscle, joint or neural structures.

Symptoms during carrying or overhead tasks Record the exact load and symptom distribution. Tingling, weakness or color change changes the assessment pathway.

Discomfort associated with breathing The scalenes take part in respiration, but new breathlessness or painful breathing must not be attributed to muscle tension without evaluation.

Contributors to assess

A change in arm or neck workload New carrying or overhead work can alter regional demands; measure individual tolerance rather than declaring these activities unsafe.

Increased respiratory demand Scalene activity can occur in normal breathing and rise with effort. It is not itself proof of a faulty breathing pattern.

Neck injury or persistent regional pain Guarding can accompany cervical injury or pain; evaluate the underlying presentation before assuming isolated muscle dysfunction.

Coexisting neural or vascular disease Radiculopathy, peripheral nerve entrapment and thoracic outlet syndromes need distinct assessment and can coexist with muscle tenderness.

For clinicians and supervised training

Clinical reference

Record the actual arm symptoms and neurological findings; scalene tenderness or a referral drawing cannot diagnose nerve compression.

Anatomy and palpation

Anatomical relationships

Anterior and middle scalenes run from cervical transverse processes to the first rib; posterior scalene reaches the second rib. They contribute to neck inclination and rib elevation during breathing. Individual attachments and muscle slips vary.[1]

  • SCM posterior border, clavicle and upper trapezius outline the lateral neck region.
  • Anterior/middle scalenes lie deep to the SCM region; posterior scalene lies farther posteriorly.
  • The first rib is deep and is not a target for blind self-pressure.

Nearby structures. Brachial plexus trunks and subclavian artery lie in the interscalene interval; the subclavian vein is anterior to anterior scalene. The phrenic nerve crosses its anterior surface, other nerves traverse nearby muscle, and the pleural dome lies near the root of the neck.

Palpation

Patient position. Clinician examination with the patient supine or seated, head and arm supported, neck near neutral and breathing quietly.

Find the landmarks

  • Identify the SCM border and clavicle without pushing behind or below them.
  • Observe rather than force the subtle lateral-neck movement with comfortable breathing or a small side-bend.

Examination sequence

  1. Use only gentle regional surface contact to ask whether the local pain is familiar; palpation is optional when anatomy is uncertain or symptoms are irritable.
  2. Do not attempt to isolate anterior, middle and posterior scalenes by deep pressure through the supraclavicular fossa.
  3. If surface contact reproduces tingling or electric pain, stop and record this as a possible neural response requiring examination, not as successful trigger-point reproduction.

Document the findings

  • Regional tenderness is nonspecific and cannot distinguish muscle pain from sensitized adjacent neural tissue.
  • An individual scalene band or first-rib position cannot be reliably established from this cautious surface examination.

Limits and precautions

  • No home deep palpation, first-rib depression or sustained supraclavicular pressure.
  • Do not press on pulsatile tissue or continue through paresthesia, dizziness or breathing difficulty.
  • A procedure near this region requires appropriately trained clinicians; palpation landmarks do not provide safe needle depth guidance.
[1][2][4]

Examination and tests

3

Active cervical motion and symptom response[3][4]

Establish a repeatable regional movement baseline and look for symptoms requiring a different pathway.

Position
Seated with trunk supported and eyes level; the examiner observes from the front and side.
Technique
Ask for slow active rotation each way, side-bending, flexion and extension within tolerance. Measure with the same inclinometer or goniometer at follow-up; record where familiar pain starts and whether symptoms remain local or travel into the arm. No end-range overpressure.
Positive finding
A repeatable restriction, familiar neck pain or a new distal symptom is an examination finding; there is no positive trigger-point cutoff.
Interpretation
A local, movement-dependent response helps select a tolerable starting movement. Arm pain, sensory change or weakness prompts a neurological examination.
Limitations
Several muscles, joints and nerves move together. Restricted motion cannot identify a single painful muscle. Stop for dizziness, visual symptoms, unusual severe headache or neurological change; a comfortable test does not exclude vascular disease.

Upper-limb neurological examination and symptom distribution[3][5][2]

Separate regional soreness from possible root, plexus or peripheral nerve dysfunction.

Position
Seated with neck and arm supported; compare both upper limbs.
Technique
Map the symptom distribution and compare light touch, key upper-limb muscle strength and biceps, brachioradialis and triceps reflexes. Check hand muscle bulk and dexterity. Record whether neck motion or a specific arm task reproduces the familiar distal complaint.
Positive finding
Consistent sensory loss, reflex asymmetry, focal weakness, atrophy or a concordant neurological distribution.
Interpretation
Findings guide a cervical-root versus peripheral-nerve/plexus hypothesis and urgency. Persistent objective loss may need electrodiagnostics or imaging selected by the clinician.
Limitations
A normal screen does not exclude intermittent neural symptoms. Pain-limited effort is not necessarily nerve damage, and the examination does not diagnose a scalene trigger point.

Task-based overhead symptom assessment[2][1]

Document load tolerance and decide whether a specialist thoracic outlet assessment is warranted.

Position
Seated or standing with both arms initially supported at the sides; no sustained forced neck position.
Technique
After history and neurovascular screening, reproduce a short, tolerable version of the reported reach or carry. Record arm height, load, time to symptoms and response to lowering/supporting the arm. Stop at symptom onset; this is a functional task comparison, not a formal EAST/Roos test.
Positive finding
Concordant arm pain or paresthesia with the specific exposure; visible swelling, color change or coldness triggers urgent vascular consideration.
Interpretation
An exposure-response pattern informs activity modification and further assessment. NTOS remains a clinical diagnosis integrating history, examination and exclusion of competing causes.
Limitations
Overhead symptoms are nonspecific. EAST/Roos, Adson and pulse changes alone do not confirm NTOS, identify a scalene as causal or exclude vascular disease. Do not provoke prolonged ischemic or neurological symptoms.

Distinguishing other causes

Cervical radiculopathy[5][3]

Findings that matter. Arm pain in a compatible root distribution with reflex, sensory or strength change, sometimes affected by neck movement.

Next step. Perform a regional neurological examination; use provocative tests only as part of the combined assessment.

Neurogenic thoracic outlet syndrome or peripheral nerve entrapment[2]

Findings that matter. Activity-related paresthesia/weakness may involve the plexus or a distal nerve; neither tenderness nor one provocative test separates them.

Next step. Map symptoms and objective deficits, assess cervical and distal nerve causes, and refer for a specialist workup when indicated.

Vascular thoracic outlet disease or another limb vascular disorder[1][2]

Findings that matter. Swelling, cyanosis, marked coldness, pallor or sudden arm pain is not an expected benign muscle finding.

Next step. Arrange urgent vascular/medical assessment; do not massage or exercise through these signs.

Cardiopulmonary cause[3]

Findings that matter. Chest pressure, exertional breathlessness, fainting or acute pain with breathing cannot be safely assigned to scalene referral.

Next step. Urgent medical assessment according to acuity, including emergency care for severe or sudden symptoms.

Treatment selection and progression

Exercise and rehabilitation

Graded neck movement[3][4]

Consider when. Assessed mechanical neck pain with a tolerable movement direction and no progressive neurological or vascular features.

Support the trunk and move the head slowly through a small comfortable rotation arc, return to center, and repeat on the other side. Add side-bending only if comfortable. Keep breathing and avoid pulling with the hand.

Dose and review
Pragmatic starting example, extrapolated from regional rehabilitation: 3–5 repetitions each way once or twice daily; start smaller for an irritable presentation.
Progression
Increase the comfortable arc before repetition count, then practise the actual task such as looking to the side while walking. Reduce the next session if symptoms remain above baseline.
Stop or reassess
Stop for arm tingling, weakness, dizziness, visual change or an unusual headache. Sharp pain or a lasting flare calls for dose reduction and reassessment.
Evidence and limits
Neck guidelines support active movement within a broader rehabilitation program. The suggested repetitions are a starting option, adjusted to symptoms and task tolerance.

Exercise and rehabilitation

Rebuild carrying and reaching tolerance[3][2]

Consider when. Assessed regional pain without progressive neurological deficit or vascular signs.

Begin with supported arm motion, then unloaded reach below the symptom-provoking height. Progress to light carrying or reaching with the neck comfortable; avoid deliberately depressing the shoulder to stretch the plexus.

Dose and review
Pragmatic example: 3–5 unloaded reaches once daily, or a brief carry below the baseline symptom threshold. This is not a validated scalene or NTOS protocol.
Progression
Increase only one of arm height, repetitions, duration or load at a time when symptoms settle and next-day function is stable.
Stop or reassess
Stop for tingling that persists, loss of strength, color/temperature change or swelling; do not reinterpret them as a normal release response.
Evidence and limits
Regional rehabilitation and specialist NTOS consensus support individualized conservative care in selected patients; evidence does not establish this muscle as the cause.

Clinician-delivered care

Clinician-guided care for persistent arm or breathing symptoms[2][1][3]

Consider when. Persistent symptoms whose neural, vascular or respiratory contribution remains uncertain.

Revisit the history, objective neurological findings and task response. Coordinate musculoskeletal rehabilitation with the appropriate medical, vascular or respiratory assessment. If increased breathing effort is present, manage its cause rather than attempting to switch the scalenes off.

Dose and review
Assessment-led treatment and review intervals; no standard course of scalene release or breathing repetitions is established.
Progression
Use improvements in breathing comfort, limb function and meaningful activity to guide the plan after diagnosis; change approach if objective deficits evolve.
Stop or reassess
Escalate progressive weakness, persistent sensory loss, acute swelling or respiratory distress instead of continuing conservative muscle treatment.
Evidence and limits
Anatomy explains why broader assessment is necessary. Specialist consensus informs NTOS care but is not proof that every tender scalene needs decompression, injections or surgery.

Reassessment and follow-up

  • Repeat the same comfortable cervical rotation or side-bending measure.
  • Track a standardized reach/carry task: height, load, duration and symptom recovery after the task.
  • Recheck strength, sensation and reflex findings when symptoms involve the arm; escalating deficits override an apparent reduction in tenderness.
  • Record work and sleep interference; breathing symptoms are followed through the relevant medical pathway.

Evidence and sources

  1. Anatomy, Head and Neck, Scalenus Muscle

    2025 · Anatomical reference

    Supports rib attachments and proximity of phrenic nerve, brachial plexus, vessels and pleura; does not establish a muscular cause of arm symptoms.

  2. Chim et al. Consensus Recommendations for Neurogenic Thoracic Outlet Syndrome from the INTOS Workgroup

    2024 · Expert consensus

    Specialist consensus on a clinical syndrome requiring differential diagnosis; not a validation study of scalene tenderness or a single provocative test.

  3. Blanpied et al. Neck Pain: Revision 2017

    2017 · Clinical practice guideline

    Regional neck assessment and multimodal rehabilitation; does not validate individual trigger points or prescribe the example doses below.

  4. Rushton et al. International IFOMPT Cervical Framework

    2023 · International clinical framework

    History-led evaluation of possible vascular disease before neck intervention; no positional maneuver reliably clears vascular risk.

  5. Wainner et al. Reliability and diagnostic accuracy of the clinical examination and patient self-report measures for cervical radiculopathy

    2003 · Prospective diagnostic study

    82 selected patients; combined findings are more informative than isolated provocation and estimates had wide confidence intervals.

Associated Trigger Points