How to stop feeling dizzy

During a full blood donation, a person gives 450 ml of blood. That is about 10 percent of an adult’s blood volume. Giving this amount is safe and doesn’t typically cause any ill effects. Infrequently (e.g. 1 percent of donations at our Blood Centre) the donor may experience side reactions during or after the donation: weakness, dizziness, cold sweat, fainting and other symptoms).

Risks of adverse reactions can be increased by:

  • not having eaten
  • lack of sleep
  • emotional stress (anxiety about the procedure, seeing blood or other donors giving blood)
  • being tired
  • pain during the needle insertion

Fainting or a feeling of faintness or dizziness can be caused by a drop in blood pressure.

Always make sure you are healthy, rested and have eaten before you give blood.

Remember:

  • to drink plenty of fluids before and after giving blood, including on the day after making a donation;
  • to prefer lean and iron-rich food (red meat, liver, dark greens and colourful vegetables etc);
  • the best time to give blood is two or three hours after you have eaten;
  • if your blood pressure tends to be low, eat saltier food – increase your salt intake before and after the donation, as this will help raise your blood pressure;
  • to consume plenty of fluids after giving blood as well; the Blood Centre offers complimentary tea, coffee and juice. And nibble on snacks – sweet cookies and salty biscuits;
  • to rest after giving blood, before you go on with your everyday activities, and let your body get used to the lower blood volume;
  • it’s advisable to avoid strenuous physical exertion on the day of the donation and the following day (working out, saunas, swimming) on the day you give blood and the day after.
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Fainting while giving blood is usually caused by psychological factors, however.

To prevent this:

  • avert your eyes from the syringe and blood receptacle;
  • try to think about something else and stay positive – you are helping save lives when you give blood;
  • the Blood Centre worker is by your side throughout the procedure and ready to help you if needed.

Tensing your muscles also keeps blood pressure from dropping: squeeze a rubber ball, periodically contract your gluteal and leg muscles.

After giving blood, you may feel faint if you stand up abruptly or if you have been standing for a long time.

If you feel that you are getting weak, then to avoid fainting:

  • do exercises using your muscles: cross your legs, tense your muscles all over your body or your gluteal muscles – this will keep blood pressure from dropping;
  • squat as soon as you feel faint;
  • if possible. lie down and elevate your legs;
  • consume salt (salty biscuits at the Blood Centre, salty meal after leaving the centre);
  • consume fluids.

kui vereloovutusel tekib minestustunne kolm poosi

If you feel you are getting weak tense your muscles; if you feel faint squat immediately

We hope that your donation is a pleasant experience and free of adverse effects.

The Blood Centre

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