When I raise my arms I feel a tightening on the left side of my chest them feel dizzy. Now my left arm has been tingling. I'm not sure what causes

Tightness. There may be tightness of muscles and/or ligaments that crimp nerves and/or circulation going to and from the arm at an area in the upper chest, called the 'thoracic outlet.' rarely, this can also affect circulation to the head, a condition called 'subclavian steal.' occasionally the first rib and collarbone are too close & do the same thing. Rarely a tumor high in the lung can contribute.

Related Questions