What causes a 5 minute burning pain in left ribs below armpit? this was jus below the bra line. pain was worse when pressed on ribs.

Most would say......: ......costochondritis or something like that because of what you mentioned as being exacerbated by PRESSING down on the ribs. However, I don't have a good reason why it should subside in 5 minutes and why it should be a BURNING pain which generally suggests the entrapment of a nerve. Unless, due to the tightness of your bra...perhaps a little twig of a nerve was caught then, released somehow by