I've been trying to research this, but I've been coming up dry and I want to write this without it being tacky or unrealistic. Background: Main character is waking up from unconsciousness. They took a pretty good whack to the head and I already have all the blackness, spinning, nausea, brain fog worked out. during the time they were KO, one of their assailants kicked them in the ribs several times basically just to be a jerk. That being said, is it plausible to regain consciousness and immediately start coughing blood? I've heard that might be a little too much injury though (punctured lung?). Keep in mind where the MC is being held, there's hostiles nearby and NO medical attention to be had. Can you cough up blood in that situation without having something as severe as a punctured lung or something else you would need to seek immediate medical attention for otherwise death would be certain?