Poppins, I have an extremely sharp stabbing like pain in my ribs under my right breast. That is the lung where my Mac has taken up residence. This pain comes and goes but when it does, it is excruciating to cough, which I constantly gave to do. I attributed the pain to coughing too hard and spraining the intercostal muscles. The pain usually lasts for several weeks at a time and makes it hard to wear a bra!! Lol. The area that gives me pain is an area where I had broken ribs from a bout of pneumonia coughing several years ago.