I have experienced sharp/dull (alternativley) directly in the middle of my ribcage under my left breast. It feels likes it's under my breast. It can be very sharp and does hurt more with deep breathing. However, it is not releived by NOY breathing. This happens 1-2 times a week for several years now. I am currently on pain medication for other issues and it does not effect this pain at all. I have increased my pain medication dose when it happens, again, no effect. I am baffled as is my Dr.--she did EKG and listened to my heart. Nothing. Help! It is very bothersome and is so sharp at times I can't even move.