Hi there!
Well, without a clinical evaluation it would be difficult to determine the cause of your pain. Possibilities that may need to be considered include gastritis, GERD, respiratory infections/ inflammations, pleuritis, chest wall inflammation etc. I would suggest getting this evaluated by a primary care physician initially and depending on the cause diagnosed/ suspected, it can be managed accordingly or specialist care may be sought.
Hope this is helpful.
Take care!
No i never got any injury!!! It start just like that while i wake up one morning...
Did you have an injury or something? That's what started mine.