Why do i pass out when giving blood?

Today i had to have a blood test, everything went fine until a couple of minutes later after it had been complete then my vision went all white blurred and i could see flashes of lightning, then i couldnt speak, the nurse said my face went all white

Is this a psychological problem or is this something else and why does it happen?

Because i do not fear the needle, i was calm and content before and after it had been complete
Its like its something i cannot control, its the same with the dentist if he takes a tooth out im fine in the process of it all
A few minutes after its been pulled out im all faint and cold sweats

The same happens to me, I have no probs giving blood (use to be a donor and Im a nurse!) but if I give a blood sample sitting up it always makes me grey out. Its partly a psychological reaction and partly the bodys reaction to a drop in blood volume (its very sensitive in some people so that just a 10ml sample for a blood test will make a difference). Tell them next time before they take blood and they will put you on a couch laying down which will help stop it happening;

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