question: Hello..I am a 46 yr old active female. I am a runner. I had extensive foot surgery in 12/2013 and just now starting to run more in the past 5 months. I have been experiencing a sharp pain in the left breast area. It occurs at anytime and more when I am upset. I also have noticed that I am not inhaling enough oxygen as when I run. I get winded more and am running only 2-5 miles at any time. Should I be concerned?