Arm Numbness, Cold Hands, and Stiff Shoulders?
Thoracic Outlet Syndrome — Nerves and vessels compressed between neck and shoulder.
Easy to mistake for cervical disc, but if MRI shows no disc problem, suspect thoracic outlet syndrome. Common in people who work long hours at computers or frequently use arms overhead.
3 Key Points This Page Explains
- What thoracic outlet syndrome is and why it occurs
- How it differs from cervical disc
- Why muscle relaxation and posture correction help
These Symptoms May Indicate Thoracic Outlet Syndrome
- Arm and hand numbness or coldness – Numbness especially toward pinky finger or inner arm.
- Stiffness between shoulder and neck – Upper trapezius area above clavicle feels heavy and stiff.
- Worse when lifting arms overhead – Numbness worsens when holding arms overhead or maintaining position.
- Feeling of weakness in hand – Frequently drop objects or difficulty with precise work.
- Hand turns pale or cold – Vascular type causes hand color change or cold sensation.
- Worse during computer work – Symptoms worsen after prolonged sitting work.
What is Thoracic Outlet Syndrome?
Nerves and vessels going from neck to arm pass through 3 narrow passages:
- Scalene gap – Between scalene muscles (anterior, middle) on side of neck
- Costoclavicular space – Between clavicle and first rib
- Under pectoralis minor – Below pectoralis minor muscle in front of chest
If any passage narrows, compressed nerves or vessels cause arm numbness, pain, and cold sensation.
Why Does It Narrow?
- Scalene tension – Stress, breathing pattern issues, forward head posture
- Pectoralis minor shortening – Shoulders roll forward from rounded shoulders
- Scapula depression – Habit of carrying heavy bag on one side
- Repetitive arm use – Occupations using arms overhead (hairstylist, painter, etc.)
How Does It Differ from Cervical Disc?
Arm numbness symptoms are similar, but cause and symptom patterns differ:
Cervical Disc
- Worse when tilting neck backward
- Radiating pain starting from neck
- Follows specific nerve distribution
- MRI confirms disc protrusion
- Changes with neck movement
Thoracic Outlet Syndrome
- Worse when lifting arms up
- Symptoms throughout shoulder-arm-hand
- Especially pinky finger side numbness
- MRI often normal
- Changes with posture or compression
Important: Cervical disc and thoracic outlet syndrome can coexist. Accurate differential diagnosis required for appropriate treatment for each.
Our Approach at Yonsei Shinmyung
Thoracic outlet syndrome rarely requires surgery. Relaxing muscles and creating space improves most cases.
- Step 1: Downshift (Circulation HD)
Release trigger points in muscles causing compression like scalenes and pectoralis minor. Resolve adhesions around nerves with hydrodissection. - Step 2: Activate (Circulation PT)
Strengthen weakened lower trapezius and serratus anterior to stabilize scapula. Restore diaphragmatic breathing to reduce scalene burden. - Step 3: Integrate
Correct rounded shoulders and forward head posture, learn habits to reduce compression in daily life.
Simple Self-Test
If symptoms appear during these movements, may suspect thoracic outlet syndrome:
EAST Test (Elevated Arm Stress)
① Raise both arms in ‘hands up’ position (90 degree bend)
② Open and close fists repeatedly for 3 minutes
③ Arm numbness or fatigue within 3 minutes → Positive
Adson Test
① Extend arm to side
② Turn head toward affected side and look up
③ Take deep breath in
④ Wrist pulse weakens or numbness → Positive
Note: These tests are for screening purposes. Accurate diagnosis requires specialist’s comprehensive physical examination and vascular ultrasound, nerve conduction studies if needed.
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We accurately assess if it’s thoracic outlet syndrome and release compressed nerves and vessels.
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