Symptoms & Causes

Symptoms of Thoracic Outlet Syndrome:

  • Pain, aches in your neck, shoulder or hand
  • numbness in the fingers or arm
  • discoloration or lack of color in your fingers or hand
  • weak or no pulse in arm
  • cold fingers/hands/arms
  • arm fatigue
  • throbbing lump near the collarbone.

What causes TOS:

TOS will often affect healthy, young, and active people.  The condition is common among athletes who participate in sports that require repetitive overhand motions of the arm and shoulder, such as baseball, swimming, volleyball, and other sports.  TOS can be caused by physical trauma, repetitive injuries, sports-related activities, and certain anatomical defects (having an extra rib).  The subclavian artery, vein, and nerves travel behind the clavicle or collar bone.  This space becomes compressed against the clavicle, the rib and the muscles.