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Of course you will get dizzy after donated blood, because you body need to produce much more red blood cells to carry oxygen around your body.You will also get tired and feel sleepy.If you get dizzy before,that means you are nervous or scare.

Most people feel fine before and after their blood donation. If someone feels dizzy BEFORE their donation it is most likely due to nerves. If someone feels dizzy AFTER their donation it can be due to nerves, family members, friends or other donors talking about feeling dizzy, the body's response to pain, donating on an empty stomach, or being close to the minimum weight requirement for donating.

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Q: Is it possible to get dizzy before and after donating blood?
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