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BloodBanker

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Will I faint when I donate blood?

Quick answerFeeling lightheaded is uncommon and usually preventable. Eating a full meal, drinking extra water, and resting afterward are the keys.

Prevent it

Have a full meal and plenty of water before you go. Skipping food is the most common cause of feeling faint.

Tell staff you faint easily

They can recline you further, watch you closely, and have you rest longer. There is no embarrassment in this.

If you feel lightheaded

Tell someone right away, lie back, and they will help. It passes quickly, and you will be looked after.

See the full first-time walkthroughCheck general eligibility

Related

Find a place to donate

Search by city, ZIP, state, or center name, or use your location to see the closest centers.

Centers near meCheck general eligibilitySee what to expect

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BloodBanker does not use affiliate links, paid rankings, or ads on mission pages. We do not sell donor health information. We link to official donation organizations so people can donate safely and locally.

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Sources and review

The guidance on this page reflects published criteria from these organizations. Eligibility and procedures vary by center and country, so confirm specifics with your donation center.

Last reviewed:
Next review due:
Reviewed by:
Reviewed against American Red Cross, AABB, and U.S. FDA donor guidance
Confidence:
High confidence