CONTENT AND TOOLS FROM THE FACULTY OF HARVARD MEDICAL SCHOOL

Harvard Reviews of Health News

A cup of yogurt a day may help keep diabetes away, a new study suggests. But the reduction in risk was relatively small. The study was based on information about the diets of nearly 200,000 health professionals. They were part of three long-term studies. Rese...

New Content

Sample Videos

Watch our "Ask Harvard Medical School" Videos

Watch a Sample.

License this content today!

Author:

Contact Us

Inquire about licensing our health information content.

Senior's Health


Blacking Out, Fainting, or Loss of Consciousness

Welcome.

The two main reasons for blacking out are insufficient blood flow to the brain and abnormal electrical activity within the brain (a seizure).

While both of these sound scary, in reality most episodes of blacking out are not related to life threatening health problems.

This guide is designed to provide insight into why you passed out. It is not a diagnostic tool or a substitute for evaluation by a health professional.

The questions are ones your doctor is likely to ask you. Your answers provide a path to better understanding of the common reasons for losing consciousness.

Let's begin.

Date Last Reviewed: 7/31/2009
Date Last Modified: 7/31/2009
Copyright by Harvard University. All rights reserved. Content Licensing by Belvoir Media Group