When I take a long breathe, there is pain deep in chaste at right side of body. I cant tell the exact region of pain but it is a point near my back in upper side.It is causing cramp in my back in upper part. There is no other problem. Due to specific movements and at the time of  long breathe pain in back becomes severe. 1 year before I faced the same  problem, that time doctor took ECG of me ...but everything was ok...now also other body parts are well...but only long breathing makes pain deep inside...what should be the probable reason??is it because of improper way of sleeping or sitting?? Or is it problem of severe acidity??

Patient is advised pulmonary function test(PFT).