The thoracic outlet is the area of the lower neck and upper chest. This area has a variety of nerves, blood vessels, muscles, and bones that run through a fairly small area. When the nerves and blood vessels of this area are compressed, irritated, or injured, they can cause a range of symptoms known as thoracic outlet syndrome (TOS).
Thoracic Outlet Syndrome
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Compression, injury, or irritation of nerves and blood vessels can be caused by: Defects in nearby structuresPoor postureTraumaRepetitive arm or shoulder movementTumors
Factors that may increase your chance of thoracic outlet syndrome include: Having an abnormal first ribPoor postureRepetitive motionTraumaObesity
Thoracic outlet syndrome may cause the following: Arm or hand painArm or hand weaknessNumbness and tinglingCold sensitivity in the hands and fingersPain or sores of the fingersPoor blood circulation to the arm, hands, and fingersSwelling of the limbSkin of arm turning pale and blue
Your doctor will ask about your symptoms and medical history. A physical exam will be done.
During an elevated arm stress test, your doctor will ask you to hold your arms and head in positions that may cause the thoracic outlet syndrome (TOS) symptoms to reappear. The results of these tests will help determine whether you have TOS and rule out other possible related conditions.
Other tests may include: Blood testsElectromyography, other nerve conduction tests
Images of internal body structures may be taken with: Chest x-rayUltrasoundCT angiographyMRI scanVenography
Treatment varies depending on your specific symptoms. In most cases, thoracic outlet syndrome is managed with pain medication and physical therapy.
Your doctor may recommend the following: Nonsteroidal anti-inflammatory drugs (NSAIDs)Muscle relaxersAntidepressantsBlood thinnersAnti-platelet medications
A physical therapist will design some exercises for you. The exercises will help to relieve symptoms by relaxing nearby muscles, improving posture, and reducing pressure on nerves and blood vessels.
As part of your treatment, you may need to make lifestyle changes: Avoid activity that causes painPractice good postureAvoid repetitive motionChange your workstation layoutIf you are overweight, talk to your doctor about how you can lose weightExercise regularly to improve strength, flexibility, and range of motion
If other treatments fail, your doctor may recommend surgery. The goal of surgery is to move or remove the source of the compression. In some people, this may involve removing part or all of the first rib to make more room for the nerves and blood vessels.
There are no current guidelines to prevent thoracic outlet syndrome.
Crotti FM, Carai A, Carai M, et al. TOS pathophysiology and clinical features.
Acta Neurochir Suppl. 2005;92:7-12.
Huang JH, Zager EL. Thoracic outlet syndrome.
Nord KM, Kapoor P, Fisher J. False positive rate of thoracic outlet syndrome diagnostic maneuvers.
Electromyogr Clin Neurophysiol.
Sanders RJ, Hammond SL, Rao NM. Diagnosis of thoracic outlet syndrome. J Vasc
Thoracic outlet syndrome. American Academy of Orthopaedic Surgeons Ortho Info website. Available at:
http://orthoinfo.aaos.org/topic.cfm?topic=a00336. Updated January 2011. Accessed July 19, 2013.
Thoracic outlet syndrome. EBSCO DynaMed website. Available at:
http://www.ebscohost.com/dynamed. Updated May 21, 2013. Accessed July 19, 2013.
Thoracic outlet syndrome. National Institute of Neurological Disorders and Stroke website. Available at:
http://www.ninds.nih.gov/disorders/thoracic/thoracic.htm. Updated December 28, 2011. Accessed July 19, 2013.
Wehbe M, Leinberry C. Current trends in treatment of thoracic outlet syndrome.
Hand Clin. 2004;20(1):119-121.
Last reviewed May 2016 by Rimas Lukas, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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