I have experienced daily pain in my left chest wall cavity when I breathe or cough. SEVERE when I sneeze. I have had an Xray, MRI, yet no one can tell me what it is. They consistently say they don t see anything. I don t know what other tests to try, or ask for, as I felt I have done a lot to seek answers. No cracked ribs, no steroids worked......???? At this point, I can no longer bend over at the waist, turn to the left, run, walk fast, or live my daily life in comfort.