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Giving Blood And Passing Out

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What causes you to pass out when giving blood and after giving blood.

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replied February 8th, 2004
Advanced Support Team
Because your body is low on blood. It takes up to 2 hours to make that pint that you donated back. And when you are low on blood your body tends to pass out, although it dosen't happen to everyone. I am the one who always passes out just at the end of giving blood.

~sara~
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replied March 22nd, 2008
veins collapsed
when doctor was trying to establish a connection to administer morphine and a sedative, my veins kept collapsing. Why did this happen?
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