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Heat Syncope (Fainting)

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:

  • Feeling faint or lightheaded.
  • Pale, cool, and moist skin.
  • Lightheadedness when changing position, such as moving from a lying position to a standing position (orthostatic hypotension).

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.

By Healthwise Staff
Primary Medical Reviewer William H. Blahd, Jr., MD, FACEP - Emergency Medicine
Specialist Medical Reviewer H. Michael O'Connor, MD - Emergency Medicine
Last Revised September 1, 2011

WebMD Medical Reference from Healthwise

Last Updated: September 01, 2011
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.