So I will often faint when I get a needle, both for vaccinations and blood tests. This is not because I have any apprehension about the needle. If I lie down for the needle rather than sitting it has so far prevented me from fainting.

Several years ago I was describing this to a medically trained friend, and they said that there was a rare physical condition where this happens, but I can't remember what they called it. So is there a distinct term for a physical rather than psychological cause of fainting after being stabbed with a needle?

  • If laying down prevented fainting, then the faint was caused by orthostatic hypotension, which is regulated by the autonomic nervous system, which is controlled in some instances, especially fainting caused by seeing blood or getting a shot, by emotions. It's very unlikely to be a significant "dysautonomia", if that's what you were told. (See, e.g. cdc.gov/vaccinesafety/concerns/fainting.html) Aug 12 at 18:19

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