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Atlas · Chest

Pectoralis Minor

Pectoralis minor connects ribs 3–5 to the coracoid process. Anterior shoulder tenderness can accompany reaching pain, but hand tingling or weakness requires a nerve and vascular assessment. Chest pain needs an appropriate medical evaluation.

Pectoralis Minor
Body region
Chest
Trigger points
3
documented in this muscle
Common symptoms
3
patterns cataloged
Contributors
3
Factors to assess

Muscle overview

Symptoms and first steps

Practical first steps

  • Reduce the duration of provocative overhead or carrying tasks.
  • Support the forearm and vary arm position.
  • Avoid ball pressure beneath the clavicle or into the armpit.

When to seek assessment

  • New chest pressure with breathlessness, sweating, nausea, faintness or arm/jaw pain needs emergency assessment.
  • Seek prompt assessment for a swollen, discolored or cold arm, or progressive hand weakness.

The retropectoralis-minor space is below the coracoid; it is distinct from the costoclavicular space. A tender coracoid region does not prove nerve compression.

Examination, palpation and treatment evidence

Illustrated overview

Pectoralis Minor

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

Pectoralis Minor · Trigger-point examples 1

Representative source regions. The illustrated markers and pain pattern are not individual assignments to the numbered trigger points.

Open full-size image

Trigger points

1. TrP1

Location. Deep anterior chest region from ribs 3–5 toward the coracoid

Trigger point map
Pectoralis Minor — Trigger point mapOpen full-size image

Shared muscle diagram; it may show several trigger points.

Referred pain map
Pectoralis Minor — Referred pain mapOpen full-size image

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

Pain referral. Anterior shoulder and chest

Pain Pattern

  • Anterior shoulder
  • Anterior chest

What This Pain Feels Like

Deep anterior-shoulder or chest aching may vary with reaching. Chest and arm symptoms require regional assessment before considering a pectoralis-minor contribution.

What Patients Report

  • Anterior-shoulder discomfort during reach
  • Chest-region ache with arm use

What Makes It Worse

  • Prolonged reaching
  • Overhead activity
  • Carrying
Browse related exercises (7)

Symptoms patients report

Anterior-shoulder tenderness Compare reaching and shoulder motion; the coracoid has several attachments.

Arm-use discomfort Record load, height and time to symptoms.

Hand symptoms accompanying shoulder pain Tingling or weakness changes the evaluation; it is not proof of a tender muscle compressing a nerve.

Contributors to assess

Repeated overhead work Can provoke a regional shoulder or thoracic-outlet presentation.

Sustained carrying Adjust load and observe whether symptoms change.

Chest or shoulder surgery Scar, nerve and shoulder problems require separate consideration.

For clinicians and supervised training

Clinical reference

A chest or arm pain map cannot diagnose pectoralis-minor syndrome, cardiac disease or a nerve lesion.

Anatomy and palpation

Anatomical relationships

Pectoralis minor runs from the anterior third through fifth ribs toward the medial/superior coracoid, deep to pectoralis major.[1][2]

  • Coracoid is a bony anterior-shoulder landmark below the lateral clavicle.
  • Ribs 3–5 orient the chest-wall origins.

Nearby structures. The brachial plexus cords and axillary vessels pass deep to the muscle. Pleura and intercostal tissues lie behind the ribs.

Palpation

Patient position. Supine with arm supported and chest appropriately draped; explain and obtain consent.

Find the landmarks

  • Locate the coracoid gently below the lateral clavicle.
  • Orient to the anterior third-to-fifth rib region beneath pectoralis major; these are surface reference levels, not direct minor-belly palpation sites.

Examination sequence

  1. Inspect and test shoulder motion before local contact.
  2. Use gentle regional contact through the overlying pectoralis major; document that the minor is deep.
  3. Ask about familiar pain and stop immediately if distal tingling appears.

Document the findings

  • Regional tenderness may contribute to assessment but cannot establish compression.

Limits and precautions

  • No deep self-palpation, firm ball pressure or attempts to provoke arm numbness.
[1][2]

Examination and tests

2

Active versus supported passive shoulder motion[3]

Distinguish painful effort from a substantial restriction of joint movement.

Position
Seated for active elevation; supine with scapula and arm supported for passive testing.
Technique
Record active elevation and external rotation, then gently compare examiner-assisted motion in the same planes. Note familiar pain, range and whether the shoulder blade substitutes early.
Positive finding
Active limitation with better passive range differs from marked restriction of both.
Interpretation
A large active/passive gap with weakness warrants cuff or nerve assessment; global passive restriction suggests a joint/capsular pathway.
Limitations
Pain, guarding and measurement position influence motion. Neither pattern identifies an individual trigger point.

Distal motor and sensory comparison[2]

Identify findings requiring a nerve-focused pathway.

Position
Seated with both arms supported and relaxed.
Technique
Compare finger spreading, thumb opposition and grip at gentle effort, then light-touch sensation across both hands. Record the distribution of symptoms and inspect for swelling or color difference.
Positive finding
Consistent weakness, sensory loss, swelling or color/temperature difference.
Interpretation
Objective deficits warrant nerve/vascular assessment; local tenderness does not locate the lesion.
Limitations
This is a screening examination, not a validated pectoralis-minor syndrome test. Normal findings do not exclude intermittent symptoms.

Distinguishing other causes

Cardiac or pulmonary chest pain[5]

Findings that matter. New pressure, exertional symptoms, breathlessness, sweating or faintness.

Next step. Urgent/emergency assessment according to the presentation.

Cervical radiculopathy or distal nerve entrapment[2]

Findings that matter. Neck-dependent symptoms or a consistent median/ulnar sensory and motor pattern.

Next step. Examine the neck and peripheral nerves; use testing when it will clarify persistent deficits.

Neurogenic or vascular thoracic outlet syndrome[2]

Findings that matter. Arm-use symptoms with an appropriate history and neurological/vascular findings after competing causes are assessed.

Next step. Specialist assessment for persistent disability or objective deficits.

Rotator-cuff or coracoid-region shoulder disorder[3]

Findings that matter. Pain chiefly during shoulder elevation or resistance, with local shoulder findings.

Next step. Complete a shoulder examination rather than inferring a compressed plexus.

Treatment selection and progression

Self-care and activity

Adapt the provoking arm task[2]

Consider when. Assessed shoulder/arm symptoms without acute vascular features.

Use shorter bouts of overhead work, reduce carried load and support the forearm between tasks.

Dose and review
Try the change during the provoking task and review its effect on pain and task tolerance before continuing.
Progression
Extend task duration only if symptoms settle promptly and strength is stable.
Stop or reassess
Reduce the load for a lasting flare; new marked weakness, numbness or sharp injury pain requires reassessment.
Evidence and limits
The cited references support anatomical orientation or regional care. The activity and starting dose are clinical adaptations, with no isolated-muscle efficacy established by those references.

Exercise and rehabilitation

Supported shoulder-blade movement[1][4]

Consider when. Local shoulder discomfort with tolerated motion.

Slide the forearm along a table and return, allowing the shoulder blade to move naturally instead of holding it down and back.

Dose and review
Starting example: one set of 5–8 comfortable repetitions on alternate days; adjust to irritability and the next-day response.
Progression
Increase comfortable reach and then move to a higher surface.
Stop or reassess
Reduce the load for a lasting flare; new marked weakness, numbness or sharp injury pain requires reassessment.
Evidence and limits
The cited references support anatomical orientation or regional care. The activity and starting dose are clinical adaptations, with no isolated-muscle efficacy established by those references.

Clinician-delivered care

Individualized rehabilitation for an assessed outlet presentation[2]

Consider when. Persistent arm-use symptoms after neck, shoulder and peripheral-nerve assessment.

Select graded reaching, scapular muscle loading and task modifications from the findings. A specialist may consider a local-anesthetic muscle block in selected diagnostic workups; response alone does not prove the diagnosis.

Dose and review
Try the change during the provoking task and review its effect on pain and task tolerance before continuing.
Progression
Review arm-use tolerance and motor/sensory findings; objective weakness changes the referral timeline.
Stop or reassess
Reduce the load for a lasting flare; new marked weakness, numbness or sharp injury pain requires reassessment.
Evidence and limits
INTOS is expert consensus supporting conservative treatment for many assessed NTOS presentations. It does not establish a routine injection or toxin course for pectoralis-minor tenderness.

Clinician-delivered care

Specialist botulinum toxin option for pectoralis minor syndrome[6]

Consider when. Diagnosed pectoralis minor syndrome with continuing arm-use limitation despite rehabilitation.

A specialist may consider ultrasound-guided botulinum toxin injection while rehabilitation continues. Agree on a functional aim and review potential temporary weakness.

Dose and review
Product, dose and timing require specialist selection; do not infer a routine series from a tender point.
Progression
Reassess the same arm-use task before considering further procedures.
Stop or reassess
New weakness or spreading symptoms require reassessment.
Evidence and limits
A small uncontrolled prospective series studied a selected syndrome population after rehabilitation. It does not establish routine efficacy for isolated pectoralis-minor trigger points.

Reassessment and follow-up

  • Compare comfortable reach height and carried load during the same arm-use task.
  • Record time to symptom onset during a consistent light overhead task and how quickly symptoms settle after lowering the arm.
  • Recheck distal strength, sensation and symptom distribution; changing motor or vascular findings require reassessment despite reduced local tenderness.

Evidence and sources

  1. University of Washington Muscle Atlas: Pectoralis Minor

    2026 · University anatomical reference

    Accessed September 2026; access year. Used for attachments and actions, not treatment efficacy or point-map validation.

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

    2024 · Expert consensus

    Clinical syndrome and differential assessment; provocative findings and local tenderness are not diagnostic alone. Injection use varies across specialists.

  3. Desmeules et al. Rotator Cuff Tendinopathy Diagnosis, Nonsurgical Medical Care, and Rehabilitation

    2025 · Clinical practice guideline

    Adults with cuff tendinopathy, including partial-thickness tears; not full-thickness tears. Recommends active rehabilitation, distinguishes calcific from noncalcific shockwave indications.

  4. AAOS OrthoInfo: Scapular (Shoulder Blade) Disorders

    2026 · Professional-society clinical guidance

    Access year. Supports examination of scapular motion and nerve-related winging; exercise examples here are practical adaptations.

  5. NHS: Chest pain

    2026 · National health-service guidance

    Access year. New or recurrent chest pain needs appropriate medical assessment; emergency features are not excluded by tenderness.

  6. Howard et al. Pectoralis minor syndrome: diagnosis with Botulinum injection and treatment with tenotomy – a prospective case series

    2022 · Prospective case series

    Selected refractory pectoralis minor syndrome; uncontrolled evidence, specialist option only.

Associated Trigger Points