I have been having pain on the left side of my chest for a while now. It comes and goes and its more bothersome than anything else. It is usually around my armpit area (usually underneath) and sometimes creeps around to the back or front of my chest momentarily. The pain doesn t last long. It also sometimes affects my shoulder and neck. The time I notice it is when I am at work, serving tables. Doctors tell me that its the strain on my body/muscles from constantly working (I work 7 days a week, between two jobs) and that lifting the trays is what is causing the pain. I had an EKG and chest x-ray done not too long ago...both came back fine. Any ideas or suggestions? Does anybody think it could be heart related? I am a 24-year-old male, in good health (I hope).