Because you can die of too much blood loss. I hope I answered your question.
It is always dangerous to lose blood. 4 units is no different. A persons body has to maintain a certain amount of blood in order for the heart and other organs to function properly.
blood is in portent
well if you lose a liter of blood it is very dangerous! you could die if you lost a lot. like a liter of blood ummm if you were talking about a bunch like a volcano gushing out yeah you would probably die. if you lost blood like to fill a small toy truck then you will not die.
They are only dangerous if you lose a lot of blood from them. (Some people don't notice how much they lose, since it drips down their throat rather than out of their nose - this is when it can be slightly dangerous). If you have a nosebleed, tilt your head forward until it finishes. If you go really (deathly) pale, or vomit blood after a nose bleed, see a doctor.
because pizza eat yum yum in bum
You need to see your doctor, because it's dangerous to lose too much blood.
Is sodium level in blood 129 dangerous
Vomiting to lose weight is always dangerous. There is no safe way to do it.
It is not dangerous. My hamster has bitten me before and tasted my blood. Your fine
I say you would have to lose half of your blood to lose consencnes, not sure about eyesight
You can lose three pints if blood to a wound
The airlock in blood infusion mast be high-volume to be dangerous for life. A small air vial will be dissolved in blood.