It’s often seen in film/books/etc. that when someone receives a chest injury, is smashed against a wall or similar, he coughs up blood or has blood coming out from his mouth. Does this actually happen? Why?
If the lungs get damaged it makes sense that blood gets coughed up, but what about injuries that affect other organs?
In: Biology
If they’re coughing up blood then it’s in their lungs. Lungs don’t work when they have fluid in them (like blood) so they have to clear themselves out (by coughing) so they can continue pumping oxygen into the bloodstream.
Edit: Regarding other organ injuries, mouth trauma is going to make you spit up blood, stomach trauma will make you vomit blood (could be mistaken for coughing it up, and other organs (ie; kidneys and liver) will make blood come out the other end. Most of the other ones cause internal bleeding which you don’t usually actually see because it’s underneath the skin.
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