Many things: The pain you describe can actually be caused by problems from the surface of the skin down to structures inside the chest including the muscles, ligaments, stomach, lungs, spleen, and heart. if you have fleeting discomfort and no other symptoms, discuss these soon with you doctor. If these come mainly when you exert yourself, or with nausea, sweating, shortness of breath, seek medical help soon!
Answered 10/15/2014
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