This doesn't bother me all that much because I have a phobia of needles and blood, and have come close to fainting on several occasions when I had blood drawn. But then again, I'm not a medical professional, and I would guess that most people with blood or needle phobias can't become a nurse.
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The excuse she gave to Fox news is a little weird, though. She can faint when she feels pain? She sounds rather fragile. Being a nurse is a demanding profession, and it seems hard to believe someone who faints when they feel pain could hack it in such a line of work