• Question: why do people faint ?

    Asked by bellalai to David, Luna, Mark, Melanie, Probash on 23 Mar 2011 in Categories: .
    • Photo: David Pyle

      David Pyle answered on 23 Mar 2011:

      It’s often due to a temporary drop in blood flow to the brain.

    • Photo: Probash Chowdhury

      Probash Chowdhury answered on 23 Mar 2011:

      Their are a variety of reasons, but one of the most common is a sudden lowering of blood pressure which means the blood does not reach the brain and the brain partially shuts down as a protective mechanism. Whilst unconscious, the body adjusts the blood pressure and blood supply is restored to the brain making us “come round” again.

    • Photo: Luna Munoz

      Luna Munoz answered on 23 Mar 2011:

      People usually faint due to insufficient blood and oxygen to the brain. It could be because of a situation, like seeing blood, which might change your blood circulation and thus the oxygen getting to the brain. People can also faint because they stand up too quickly, where the heart and veins work hard to fight against the effects of gravity pulling the blood to your feet. So, this change in blood pressure may lead to a temporary problem with the flow of blood to the brain.

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