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What to Do When Someone Faints
Fainting — medically termed syncope — is a sudden, brief loss of consciousness caused by temporarily insufficient blood flow to the brain. It is remarkably common: approximately 40% of people will fai...
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Dr. Emily Rodriguez
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|May 1, 2026Medically reviewed by Dr. Emily Rodriguez · Editorial Policy
Fainting — medically termed syncope — is a sudden, brief loss of consciousness caused by temporarily insufficient blood flow to the brain. It is remarkably common: approximately 40% of people will faint at least once in their lifetime. Most fainting episodes are benign, caused by a transient drop in blood pressure and heart rate in response to specific triggers. But some fainting — particularly in older adults, people with heart disease, or those with certain warning signs — reflects serious underlying conditions requiring prompt evaluation.
Why Fainting Happens
The brain has extraordinary sensitivity to its blood supply — even brief (5–10 second) interruption of blood flow causes loss of consciousness. Syncope results from a transient fall in cerebral perfusion pressure — meaning the brain's blood pressure drops below the threshold needed to maintain consciousness.
Vasovagal Syncope (Most Common)
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Primary Source
American Heart Association: SyncopeMedical Disclaimer: This article is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of your physician or other qualified health provider with any questions you may have regarding a medical condition.
Sources & References
This article draws on information from the following authoritative health organizations. Always consult a qualified healthcare professional for personal medical advice.