question: First off i have a mild case of pectus excavatum.. I just started working out like two months ago an here lately I ve been putting on a lot of muscle.. But now sence a week ago theirs a sharp pain on the rib right under my chest an arm pit, it hurts really bad in certain positions an definetly when I bench or something.. I m really hoping it s just a muscle I pulled an not this stupid whole in my chest..