Thoracic Outlet Syndrome

Thoracic Outlet Syndrome (TOS) refers to a condition that affects the area between the rib cage and the collar bone. In that area, blood vessels and nerve pass through a narrow space leading to the arm. If they do not have sufficient room and are compressed symptoms materialize in the hands or arms.

The presence of an extra rib above the typical first rib can cause the condition or it can be attributed to an abnormally tight band connecting the spinal vertebrae to a rib. An old injury in the area or overuse of the shoulder can also cause thoracic outlet syndrome, which is more prevalent in people whose necks are long and whose posture is characterized by slouched or “droopy” shoulders.

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