Thoracic Outlet Syndrome (TOS)

  • Medical Author:
    William C. Shiel Jr., MD, FACP, FACR

    Dr. Shiel received a Bachelor of Science degree with honors from the University of Notre Dame. There he was involved in research in radiation biology and received the Huisking Scholarship. After graduating from St. Louis University School of Medicine, he completed his Internal Medicine residency and Rheumatology fellowship at the University of California, Irvine. He is board-certified in Internal Medicine and Rheumatology.

  • Medical Editor: Jerry R. Balentine, DO, FACEP
    Jerry R. Balentine, DO, FACEP

    Jerry R. Balentine, DO, FACEP

    Dr. Balentine received his undergraduate degree from McDaniel College in Westminster, Maryland. He attended medical school at the Philadelphia College of Osteopathic Medicine graduating in1983. He completed his internship at St. Joseph's Hospital in Philadelphia and his Emergency Medicine residency at Lincoln Medical and Mental Health Center in the Bronx, where he served as chief resident.

Symptoms of Rheumatoid Arthritis

Thoracic Outlet Syndrome Symptoms

Plumbing the Pits of Despair With Thoracic Outlet Syndrome

My symptoms started off somewhat vague. I had taken on a new position at work that required a lot of time on the computer. I began having pain on my right side in my neck and shoulder with tingling in my hand at the end of the day.

Thoracic outlet syndrome facts

  • Thoracic outlet syndrome is a condition whereby symptoms are produced from compression of nerves or blood vessels, or both, because of an inadequate passageway through an area (thoracic outlet) between the base of the neck and the armpit.
  • Thoracic outlet syndrome symptoms include
  • Diagnosis of thoracic outlet syndrome is suggested by the symptoms and physical findings and is sometimes supported by nerve conduction and/or radiology tests.
  • Treatment of thoracic outlet syndrome usually involves physical-therapy exercises and avoiding certain prolonged positions of the shoulder.

What is thoracic outlet syndrome?

Thoracic outlet syndrome (TOS) is a condition whereby symptoms are produced (such as numbness in fingers, pain in shoulder, arm, and neck) due to compression of nerves and/or blood vessels in the upper chest. The passageway for these nerves and blood vessels to exit the chest and supply the upper extremities is referred to as the thoracic outlet. Muscle, bone, and other tissues border the thoracic outlet. Any condition that results in enlargement or movement of these tissues of or near the thoracic outlet can cause the thoracic outlet syndrome. These conditions include muscle enlargement (such as from weight lifting), injuries, an extra rib extending from the neck (cervical rib), weight gain, and rare tumors at the top of the lung. Often no specific cause is detectable.

It is felt by some scientists that the evolution of the torso of primates from a four-legged to a two-legged position may predispose humans to the development of thoracic outlet syndrome. The resulting vertical posture produced flattening of the chest cage and a shift of the shoulder joint backward, both of which narrowed the thoracic outlet.

Picture of thoracic outlet syndrome (TOS) showing symptom areas
Picture of thoracic outlet syndrome (TOS) showing symptom areas
Medically Reviewed by a Doctor on 6/10/2016

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