Why does your upper left arm tingle?

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This can be caused by many things.  The least ones are having your arm in one position for too long, or doing repetitive work that uses the same muscles and tendons all day long.  Carpal Tunnel is usually in the hand and can cause tingling or even run up the arm when using fingers or palms.

If this tingling has been persistent then please see your doctor immediately!  When someone is having a heart attack (not trying to frighten you) they do not always get the full symptoms of a heart attack or stroke.  The usual symptoms are tingling in the arm which radiates into the jaw and along the chest (a feeling as if  someone has placed a heavy object on your chest.)  It's a good idea to have your doctor check this out!!!  

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