Thoracic outlet syndrome results from compression of the neurological structures (brachial plexus), vascular structures (arteries and veins), or both (neurovascular sleeve).
Classic symptoms of Thoracic Outlet Syndrome include arm pain, arm numbness, and arm tingling that continues into the fingers. Also weakness, muscle wasting, muscle atrophy, a feeling of coldness in the hands, and loss of fine motor skills could be seen.
Poor posture and improper breathing can contribute to Thoracic Outlet Syndrome.