Thoracic Outlet Syndrome (TOS)

​Thoracic outlet syndrome symptoms can vary, depending on which structures are compressed. When nerves are compressed, signs and symptoms of neurological thoracic outlet syndrome include:

• Muscle wasting in the fleshy base of your thumb (Gilliatt-Sumner hand)
• Numbness or tingling in your arm or fingers
• Pain or aches in your neck, shoulder or hand
• Weakening grip

Signs and symptoms of vascular thoracic outlet syndrome can include:

• Discoloration of your hand (bluish color)
• Arm pain and swelling, possibly due to blood clots
• Blood clot in veins or arteries in the upper area of your body
• Lack of color (pallor) in one or more of your fingers or your entire hand
• Weak or no pulse in the affected arm
• Cold fingers, hands or arms
• Arm fatigue with activity
• Numbness or tingling in your fingers
• Weakness of arm or neck
• Throbbing lump near your collarbone