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Just pointing out that a vasovagal response to blood isn’t an insurmountable obstacle to becoming a physician. The reflex can be overcome through exposure therapy in conjunction with a limit course of anti-anxiety medication in most cases.
Anecdotally there’s at least 1 or 2 individuals in every med school class who faints at sight of blood or other bodily fluids, needles or some medical procedure (childbirth and surgery are common triggers).