Here are some scientific facts about blood loss for all you
psychopathswriters out there.
As someone who’s lost about a litre of blood in a really short time (look I took advil and then it gave me the mother of all nosebleeds, like it literally WOULD NOT STOP and I fainted from the blood loss and it lasted almost half an hour), if you have low blood pressure (raise your hand to high-five me), these symptoms are going to kick in a lot sooner because blood loss lowers your BP. There’s going to be nausea, dizziness; you’re going to feel your pulse everywhere in your body because your heart is pounding and going WTF WHERE IS ALL MY OUTPUT GOING; you’re not going to be able to get off the ground without feeling like you need to take a good, long nap on that bathroom floor that was nice and clean and is now home to your own personal biohazard lake.
also some people are naturally hypovolemic!! like some people with dysautonomia for example can function as if having lost a litre and a half or more of blood literally just from STANDING UP, never mind actually losing blood. heart rate can also be super variable for a lot of disorders like cardiomyopathy, sarcoidosis and a bunch of others can cause ventricular tachycardia (really serious, like, possible cardiac arrest, serious), wolfe-parkinson-white syndrome, copd, etc can cause atrial tachycardia (less serious than ventricular, but we’re still talking symptoms up to and including loss of consciousness), and also lgr in a lot of cases where someone is losing a lot of blood chances are they were pretty damn active before the injury was sustained, so they’re going to have sinus tachycardia; it doesn’t have any symptoms, but it WILL make them bleed out faster. so, you know, some more things to keep in mind.