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Thoracic Outlet Care Center

Thoracic Outlet Syndrome (TOS): Nerve & Vessel Compression & Treatment

A comprehensive medical guide to understanding nerve and blood vessel compression between the neck and shoulder, neurogenic versus vascular classifications, clinical diagnostics, and targeted treatment solutions.

Expert Diagnostics Decompression Care Non-Invasive Approach

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Thoracic Outlet Fundamentals

Understanding Thoracic Outlet Syndrome (TOS)

Thoracic outlet syndrome (TOS) occurs when the brachial plexus nerves or major subclavian blood vessels traveling between the base of the neck and the shoulder become chronically compressed as they pass through the narrow passageway formed by the collarbone, first rib, and tight scalene muscles.

This compression can produce a wide spectrum of symptoms ranging from aching arm pain and numbness to vascular swelling or coldness in the hand. Our clinic provides thorough clinical evaluation and targeted treatment for thoracic outlet syndrome to relieve pressure and restore normal nerve conduction and blood flow.

Thoracic Outlet Syndrome Overview
Warning Signs

Symptoms & Classifications of TOS

Do not ignore these physical signs associated with brachial plexus and subclavian vessel entrapment:

01
Neurogenic Numbness

Aching pain, numbness, and tingling traveling down the arm into the ring and pinky fingers (C8-T1).

02
Venous Swelling

Arm swelling, heaviness, bluish discoloration, and prominent veins resulting from subclavian vein compression.

03
Arterial Coldness

Coldness, paleness, or diminished pulse in the hand caused by subclavian artery restriction.

04
Postural Fatigue

Rapid arm fatigue and aching in the neck and shoulder when holding the arms overhead.

Causes
Trigger Factors

What Causes Thoracic Outlet Syndrome?

Passage narrowing stems from scalene muscle hypertrophy, cervical ribs, and postural depression:

  • Anatomical Variations: Presence of an extra congenital cervical rib or anomalous fibrous bands narrowing the outlet.
  • Scalene Muscle Hypertrophy: Overdeveloped or chronically tight anterior and middle scalene muscles compressing the brachial plexus.
  • Postural Depression: Slouched shoulders and depressed collarbones reducing available space in the thoracic triangle.
  • Post-Traumatic Scarring: Previous clavicle fractures or severe whiplash trauma creating fibrous scar tissue around vessels.
Care Protocols

Treatment Strategy & Surgical Decompression

Managing TOS emphasizes postural retraining, scalene muscle release, and surgical first rib resection for vascular cases:

Postural Retraining & Physio

Targeted physiotherapy focusing on scapular elevation, scalene muscle stretching, nerve glides, and postural awareness.

Surgical Decompression

First rib resection and scalenectomy surgery indicated for severe neurogenic deficits or acute vascular thrombosis.

Clinical Evaluation Framework

How Thoracic Outlet Syndrome Is Diagnosed

Our structured 4-tier clinical diagnostic protocol evaluates Adson's, Roos, and Wright tests, duplex ultrasound vascular imaging, nerve conduction studies, and cervical rib radiography.

Phase 01

1. History & Compression Pattern Audit

Detailed screening of overhead work positions, arm heaviness, hand color changes, and paresthesia distribution.

  • Overhead Arm Activity Trigger: Documenting symptom onset when holding arms up (painting, hair styling, shelf stocking).
  • Ulnar Nerve Distribution Numbness: Tracking tingling specifically in the ring and little fingers (C8-T1 nerve roots).
  • Arm Swelling & Discoloration: Inquiring about bluish arm discoloration and morning swelling (venous TOS).
  • Hand Coldness & Pallor: Tracking cold intolerance and pale fingers in cold weather (arterial TOS).
  • Prior Clavicle Fracture History: Screening historical collarbone breaks or severe whiplash trauma.
  • Heavy Backpack / Heavy Lifting Strain: Auditing military service, heavy rucksacks, or heavy tool belts.
  • Night Sleep Disruption: Evaluating arm deadness and numbness waking patient from sleep.
  • Visual Analog Scale (VAS): Recording pain and heaviness scores (0-10 scale).
  • Baseline DASH Functional Score: Measuring upper limb disability across daily living activities.
Phase 02

2. TOS vs Cervical Radiculopathy Differential

Differentiating thoracic outlet compression from cervical disc herniations and carpal/cubital tunnel entrapments.

  • Cervical Radiculopathy Rule-Out: Differentiating neck disc nerve root pinches from thoracic outlet brachial plexus compression.
  • Carpal Tunnel Syndrome Differentiation: Ruling out wrist median nerve compression vs proximal thoracic outlet entrapment.
  • Cubital Tunnel Syndrome Screen: Differentiating elbow ulnar nerve entrapment from lower trunk brachial plexus TOS.
  • Subclavian Vein Thrombosis (Paget-Schroetter): Screening acute effort thrombosis in active athletes (venous TOS emergency).
  • Complete Neurological & Vascular Exam: Checking radial pulses, capillary refill, and motor strength.
  • Septic Arthritis Emergency Rule-Out: Ruling out infected joint or vascular ischemia requiring emergency surgical intervention.
Phase 03

3. Physical Exam & Provocative Tests

Adson's test, Roos test (Elevated Arm Stress Test), Wright's test, and supraclavicular palpation.

  • Adson’s Test: Neck extended and rotated toward tested side during deep inspiration while monitoring radial pulse drop.
  • Roos Test (EAST - Elevated Arm Stress Test): Arms held at 90° abduction/external rotation opening and closing hands for 3 minutes (reproducing ischemic ache and numbness).
  • Wright’s Test (Hyperabduction Test): Hyperabducting arm checking pulse obliteration beneath pectoralis minor muscle.
  • Costoclavicular (Eden) Test: Retracting and depressing shoulders to compress space between clavicle and first rib.
  • Supraclavicular Tenderness Palpation: Digital palpation over scalene triangle reproducing radiating symptoms.
  • Postural Alignment Inspection: Evaluating rounded shoulders and depressed scapulae.
  • Physical Baseline Record: Documenting Roos test endurance time and pulse drop findings for rehab tracking.
Phase 04

4. Vascular Ultrasound, MRI & Surgical Roadmap

Duplex ultrasound, cervical X-rays (cervical rib), physical therapy, and first rib resection surgery.

  • Cervical Spine & Chest Radiographs: Visualizing congenital cervical ribs or bony first-rib anomalies.
  • Duplex Vascular Ultrasound: Assessing subclavian artery and vein flow velocities with provocative arm positioning.
  • CT / MR Angiography: Advanced vascular imaging confirming arterial compression or venous thrombosis.
  • Targeted Postural Physiotherapy Protocol: Prescribing scalene stretches, first-rib mobilization, and scapular elevation training.
  • Surgical Decompression (First Rib Resection): Transaxillary or supraclavicular surgical removal of the first rib and release of tight scalene muscles.
  • Multi-Specialist Vascular & Spine Panel: Collaborative vascular surgeon, thoracic specialist, and physical therapist review.
  • Digital Archiving: Secure cloud storage of vascular duplex scans and DASH scores in patient portal.
  • Final Clinical Clearance: Approving pain-free return to work, sports, and normal upper limb activities.
Clinical Leadership

Meet Our Neck & Shoulder Care Experts

Specialized care focused on managing Thoracic Outlet Syndrome (TOS), improving neck and shoulder mobility, addressing posture-related limitations, and supporting muscular balance. Personalised physiotherapy and rehabilitation aim to improve movement control and upper-limb function based on each patient's symptoms and clinical assessment.

Ask Our Specialist
Thoracic Outlet Syndrome Care

Thoracic Outlet Syndrome (TOS) occurs when nerves or blood vessels are compressed near the space between the collarbone and first rib. Symptoms may include neck, shoulder, or arm discomfort, tingling, numbness, or weakness. Depending on the type and severity, management may include clinical assessment, posture modification, guided physiotherapy, and exercises to improve mobility and movement control. Sudden arm swelling, bluish discoloration, coldness, or significant weakness requires urgent medical evaluation.

Real Experiences

Treatment Videos/testimonials

Watch real recovery videos from patients who regained their active lifestyles.

APRC Physio Guru

Patient Recovery Story

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Patient Recovery Story

Real patient experiences and recovery journeys.

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Help Center

Frequently Asked Questions

Clear answers to common clinical questions about thoracic outlet syndrome, types, and treatments.

Thoracic Outlet Syndrome occurs when nerves or blood vessels passing through the tight space between the collarbone and first rib become compressed. Causes include poor posture (slouching), tight scalene neck muscles, an extra congenital cervical rib, or post-traumatic scar tissue.

1) Neurogenic TOS (95% of cases) involves compression of the brachial plexus nerves, causing pain and numbness. 2) Venous TOS involves subclavian vein compression, causing arm swelling and discoloration. 3) Arterial TOS involves artery compression, causing coldness and paleness in the hand.

The Roos Test is a clinical exam where you hold your arms up at 90 degrees with elbows bent and rapidly open and close your hands for 3 minutes. Reproducing aching pain, heaviness, or numbness in the arms within this timeframe indicates thoracic outlet compression.

Yes. Slouched shoulders and forward head posture depress the collarbone downward toward the first rib, drastically narrowing the thoracic outlet passageway and crushing the underlying nerves and blood vessels.

Yes. Postural re-education, stretching tight scalene and pectoralis minor muscles, strengthening scapular elevators, and nerve gliding exercises successfully resolve the vast majority of neurogenic thoracic outlet syndrome cases without surgery.

A cervical rib is an abnormal extra rib growing from the seventh cervical vertebra in the neck. Because it occupies space in the thoracic outlet, it frequently stretches and compresses the brachial plexus and subclavian artery, leading to TOS.

Surgery (first rib resection and scalenectomy) is urgently indicated for vascular TOS (arterial or venous clots/compression) and is considered for neurogenic TOS when severe, progressive neurological deficits fail to improve after 6 months of physical therapy.

Duplex ultrasound measures blood flow velocity through the subclavian artery and vein while your arm is placed in provocative positions that recreate compression, identifying whether blood flow drops or clots form.

Because both conditions cause hand numbness and tingling, TOS is sometimes mistaken for carpal tunnel. However, TOS symptoms usually involve the ring and pinky fingers and are triggered by arm elevation, whereas carpal tunnel affects the thumb/index/middle fingers.

Yes. Heavy weightlifters and bodybuilders can develop scalene and pectoral muscle hypertrophy from intense training (such as heavy shoulder presses and bench presses), which narrows the thoracic outlet and compresses the brachial plexus.
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