TwitterRSSFacebookDirectors Blog
  Disorders A - Z:   A    B   C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

Skip secondary menu

NINDS Thoracic Outlet Syndrome Information Page


Table of Contents (click to jump to sections)


Listen to this page using ReadSpeaker


What is Thoracic Outlet Syndrome?

TOS is an umbrella term that encompasses three related syndromes that involve compression of the nerves, arteries, and veins in the lower neck and upper chest area and cause pain in the arm, shoulder, and neck.  Most doctors agree that TOS is caused by compression of the brachial plexus or subclavian vessels as they pass through narrow passageways leading from the base of the neck to the armpit and arm, but there is considerable disagreement about its diagnosis and treatment.
Making the diagnosis of TOS even more difficult is that a number of disorders feature symptoms similar to those of TOS, including rotator cuff injuries, cervical disc disorders, fibromyalgia, multiple sclerosis, complex regional pain syndrome, and tumors of the syrinx or spinal cord.  The disorder can sometimes be diagnosed in a physical exam by tenderness in the supraclavicular area, weakness and/or a "pins and needles" feeling when elevating the hands, weakness in the fifth ("little") finger, and paleness in the palm of one or both hands when the individual raises them above the shoulders, with the fingers pointing to the ceiling.  Symptoms of TOS vary depending on the type.

           Neurogenic TOS has a characteristic sign, called the Gilliatt-Sumner hand, in which there is severe wasting in the fleshy base of the thumb.  Other symptoms include paresthesias (pins and needles sensation or numbness) in the fingers and hand, change in hand color, hand coldness, or dull aching pain in the neck, shoulder, and armpit. 

          Venous TOS features pallor, a weak or absent pulse in the affected arm, which also may be cool to the touch and appear paler than the unaffected arm.  Symptoms may include numbness, tingling, aching, swelling of the extremity and fingers, and weakness of the neck or arm.. 

          Arterial TOS most prominently features change in color and cold sensitivity in the hands and fingers, swelling, heaviness, paresthesias and poor blood circulation in the arms, hands, and fingers..

There are many causes of TOS, including physical trauma, anatomical defects, tumors that press on nerves, poor posture that causes nerve compression, pregnancy, and repetitive arm and shoulder movements and activity, such as from playing certain sports.  

TOS is more common in women.  The onset of symptoms usually occurs between 20 and 50 years of age.  Doctors usually recommend nerve conduction studies, electromyography, or imaging studies to confirm or rule out a diagnosis of TOS.

Is there any treatment?

Treatment begins with exercise programs and physical therapy to strengthen chest muscles, restore normal posture, and relieve compression by increasing the space of the area the nerve passes through.   Doctors will often prescribe non-steroidal anti-inflammatory drugs (such as naproxen or ibuprofen) for pain.  Other medicines include thromobolytics to break up blood clots and anticoagulants to prevent clots.  If this doesn't relieve pain, a doctor may recommend thoracic outlet decompression surgery to release or remove the structures causing compression of the nerve or artery.

What is the prognosis?

The outcome for individuals with TOS varies according to type. The majority of individuals with TOS will improve with exercise and physical therapy.  Vascular TOS, and true neurogenic TOS often require surgery to relieve pressure on the affected vessel or nerve. 

What research is being done?

The National Institute of Neurological Disorders and Stroke (NINDS) and other institutes at the National Institutes of Health support research in TOS through grants to major medical research institutions across the country.  Much of this research focuses on finding better ways to diagnose and treat TOS. 

NIH Patient Recruitment for Thoracic Outlet Syndrome Clinical Trials

Organizations

Column1 Column2
American Chronic Pain Association (ACPA)
P.O. Box 850
Rocklin, CA   95677-0850
ACPA@theacpa.org
http://www.theacpa.org
Tel: 916-632-0922 800-533-3231
Fax: 916-652-8190

National Rehabilitation Information Center (NARIC)
8201 Corporate Drive
Suite 600
Landover, MD   20785
naricinfo@heitechservices.com
http://www.naric.com
Tel: 301-459-5900/301-459-5984 (TTY) 800-346-2742
Fax: 301-562-2401



Prepared by:
Office of Communications and Public Liaison
National Institute of Neurological Disorders and Stroke
National Institutes of Health
Bethesda, MD 20892



NINDS health-related material is provided for information purposes only and does not necessarily represent endorsement by or an official position of the National Institute of Neurological Disorders and Stroke or any other Federal agency. Advice on the treatment or care of an individual patient should be obtained through consultation with a physician who has examined that patient or is familiar with that patient's medical history.

All NINDS-prepared information is in the public domain and may be freely copied. Credit to the NINDS or the NIH is appreciated.

Last updated December 28, 2011