Hi guys. For some reason every now and then i get this really annoying stabbing pain under my left breast towards the middle of my chest. It comes and goes, sometimes it will last literally 5 seconds and then sometimes i can have it stabbing away for a few hours. I've had this problem for years but never worked out what it could be. I cough a lot in the mornings due to excess mucus which i need to clear, could it be a chest wall issue? Just wondering if anyone has had the same thing? Its incredibly irritating and also scary due to its close proximity to the heart!!!