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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It all depends on the individual. How it works is that a psychiatric effect causes their body to redirect blood to their own viscera and away from their brain, leading to light-headeness, and in extreme cases, loss of consciousness. It is distinct from a physiological effect, such as narcolepsy or epilepsy, although the involuntary nature of the effect and the potential correlation with emotional experience of stress being a trigger, in concert with the similarities of result, can make it seem as if they are similar.
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