I am an 18 year old male. About 150 pounds and in pretty good shape. I kind of nervous because when I press (more towards my left armpit) on my left pectoral muscle (towards the bottom) I receive a slight pain. I can also feel an uncomfortable feeling if I breathe really really deep.

I am an 18 year old male. About 150 pounds and in pretty good shape. I kind of nervous because when I press (more towards my left armpit) on my left pectoral muscle (towards the bottom) I receive a slight pain. I can also feel an uncomfortable feeling if I breathe really really deep.

Do you usually bench press or do push ups? If so, have you eased off or stopped for a while? That will cause the muscle to contract back and causes pain that you can also feel when you breathe deeply. It can actually be quite severe but is short-lived although, it can recur. **However ** if it is accompanied by numbness in your left arm or shortness of breath or sweating, consult an emergency room ASAP.