 [ Symptoms ] can your lungs be ruptured if you cracked a rib [ Disease ] well not exactly the lung does not rupture  exactly it can collapse though this is called  pneumothorax  a broken rib can indeed puncture your lung in fact it is not all that uncommon if you watch any of those real life trauma shows on television you will see emergency room personnel placing chest tubes in patients due to collapsed lungs and you can bet some of those collapses occurred due to fractured ribs but if by cracked you mean not completely fractured or displaced  then the answer probably is no  when a rub breaks and the two sides pull away from each other then one of them can puncture the lung if a rib is cracked but the ends never comes apart then it is unlikely to penetrate the tissue surrounding the lung on the other hand if you took a forceful blow to the chest that alone could cause a collapsed not ruptured lung so if you experienced chest trauma sufficient to crack a rib you certainly could experience a pneumothorax surprisingly you can experience a collapsed lung without any known cause whatsoever wishing you well