It seems either you have lung infection or some kind of trauma over ribs. But since you have not mentioned any kind of fever, infection might not have manifested or is not there. I would like to tell you not to take analgesic or anti inflammatory unnecessarily and avoid if you can. Instead if I were your physician, I would suggest you to take wonderful herbal medicine acting on body to cure pain, inflammation and also anti bacterial. Please take Curcumin i.e. turmeric powder in milk or water for two to three weeks and see for yourself. You may also paint the same over ribs by mixing in clarified butter and cover with cotton. No side effects. Totally safe. Very effective. Then you always have option to switch to toxic pain killers if not satisfied with pure herbs. Hope it helps you.