Venous Thoracic Outlet Syndrome
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Venous thoracic outlet syndrome (TOS) is a condition that happens when the subclavian vein is squeezed or compressed. The subclavian vein is the vein that returns blood from the arm and hand to the heart. To reach the arm, this vein must pass through the thoracic outlet. This is a tight space under the collarbone (clavicle) and above the top rib.
Depending on which structures are affected, you may have symptoms on one or both sides of your body.
This condition may be caused by doing hard work with your arms, especially if you have to lift your arms above your head. A blood clot may form in the vein.
These signs and symptoms may be worse when you hold your arms over your head.
This information is not intended to replace advice given to you by your health care provider. Make sure you discuss any questions you have with your health care provider.
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