Faiting at the sight of blood -- runs in families?
August 4, 2005 9:34 PM Subscribe
Any MeFites around who faint at the sight of blood? If so, are you aware of any close relatives who do the same?
posted by greatgefilte to Health & Fitness (19 answers total) 1 user marked this as a favorite
I was thinking about this the other day, and it struck me that fainting at the sight of blood is such a distinct phenomenon, one that starts from an early age (at least, according to the folks I've spoken to thus far), and thus, perhaps there's a genetic basis to it. It reminds me of ACHOO syndrome
-- involuntary sneezing after coming into bright sunlight, which has shown to be heritable.
Not that I think I'm going to get any funding to study this, but I'm curious if the fainting reflex is heritable too, and what might be the physiological basis behind it.