• Question: why do you get headrush when you stand up too quickly?

    Asked by jb4eva to Alison, Artem, Caroline, John, Gunther on 19 Jun 2012.
    • Photo: Caroline Dalton

      Caroline Dalton answered on 19 Jun 2012:

      It is caused by blood pooling in the lower part of your body causing a temporary decrease in blood pressure in the upper part of the body and decreased blood supply to the brain.

    • Photo: Artem Evdokimov

      Artem Evdokimov answered on 20 Jun 2012:

      If you look up the answer to ‘why we faint’ question – it’s part of the same phenomenon. Basically our circulatory system is an interconnected system of flexible tubes filled with blood. When we stand up rapidly the body has to catch up with the change in hydrostatic pressure – this takes a little bit of time, during which we might feel dizzy due to lower blood flow to the brain 🙂

    • Photo: John Short

      John Short answered on 20 Jun 2012:

      It is caused by Positional Hyoptension – means your blood pressure drops when you change positions (like lying or sitting to standing) – When you change positions, the slight blood loss in the brain causes the “dizziness” or head rush – and sometimes black out – and once you are on the floor – the brain gets enough blood and you wake up

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