Symptoms of thoracic outlet syndrome vary, depending on what is being compressed. If nerves are being compressed, you will probably feel pain and tingling that starts in the neck and shoulder and spreads into the hand on the affected side. If a vein or artery is being compressed, this hampers the oxygen supply and may cause a bluish discoloration or lack of color in the affected hand. Pressure on a vein or artery also causes pain and swelling in the affected arm.
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