If you are experiencing a medical emergency please dial 911 immediately
Heat syncope occurs when a person faints suddenly and loses consciousness because of low blood pressure. Heat causes the blood vessels to expand (dilate), so body fluid moves into the legs by gravity, which causes low blood pressure and may result in fainting.
Symptoms that could lead to heat syncope (fainting) include:
Heat syncope can be caused by blood pooling in the legs if a person has been standing still for a long time in a hot environment. It can also be caused by vigorous physical activity for 2 or more hours before the fainting happens.
A person's risk of developing heat syncope increases when the person has not adjusted (acclimated) to a hot environment. Being dehydrated may also increase the risk for heat syncope. Recovery is rapid after the person lies down in a cool environment.
Heat syncope is sometimes a symptom of a nervous system, metabolic, or cardiovascular problem that needs further medical evaluation.
Last Revised: September 1, 2011
Author: Healthwise Staff
Medical Review: William H. Blahd, Jr., MD, FACEP - Emergency Medicine & H. Michael O'Connor, MD - Emergency Medicine
To learn more visit Healthwise.org
© 1995-2013 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.