eli5: Fainting at the sight of blood. How does it work.

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Do people feel fear or disgust before fainting? And how much blood does it take to make someone faint? Is seeing someone with a nose bleed enough or do they need to see a lot more like a gallon?

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Anonymous 0 Comments

This happens to me but it needs to be my own blood from my own wound. It doesn’t need to be very much, but seems like it’s more about the rate of bleeding, so yeah, I guess the amount is a factor. There is maybe a little fear, like how deep is the cut and will I need stitches? Moreover it’s a feeling of light-headedness and not being able to think and act quickly.

I’ve learned to just cover and put pressure on the wound while I put my mind on dealing with it, like heading toward a first aid kit. Seems to help, but all bets are off if I get like a seriously major wound someday–not sure I’ll be able to keep the presence of mind to help myself.

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