Chest pain/pressure constantly in upper left side

[TNGreg]

I'm a 46 yr old white male who just retired after 25 years of military service.  I passed all of my retirement physicals and medical tests, but have noticed some discomfort the last three days.  I'm 5'6 and 185lbs.  The pain or pressure is located between the center of my left breast and the point of my left shoulder.  The pain is local and doesn't move.  I often don't notice it until I relax or try to sleep.  The affected area is about the size of a softball.  It has been consistant for the last three days.  To describe the pain - I'd have to say it is somewhat sharp, but mostly dull (not really one or the other).

Thank you,
TNGreg

[ed34]

With Angina or most heart problems, you would notice the discomfort with exertion and the discomforts would seriously diminish or disappear when you relax, unsually within a few seconds. Obviously the more work you do, the harder your heart has to work and so any problems will usually cause a discomfort. I've had pulled muscles in my chest before
and they have lasted several weeks. I was in the building trade and so always pulling on it again and again every day, never letting it recover. It would be more painful when I relaxed, probably because it cooled down. It even hurt at times when I inhaled which made me see a GP thinking I had a lung disease.
You could see a cardiologist to give you peace of mind, but what you describe seems to be the reverse of angina or most heart problems.
If you have a blockage in your coronary artery, which is bad enough to cause discomfort at rest, the pains should increase dramatically by even walking slowly.