Having pain on left side of heart under armpit near ribcage and stabbing pain under breastbone also shortness of breath every day. Wat could this b?
The two most worrisome diagnoses that come to mind are a cardiac event (a heart attack) or a blood clot in the lung (called a pulmonary embolus).
Both are serious conditions for which you should seek immediate treatment. How long has this been going on?
SHORTNESS OF BREATH