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|Classification and external resources|
|Patient UK||Heat syncope|
Heat syncope is fainting or dizziness as a result of overheating (syncope is the medical term for fainting). It is a heat-related illness. The basic symptom of heat syncope is fainting, with or without mental confusion. Heat syncope is caused by peripheral vessel dilation, resulting in diminished blood flow to the heart and dehydration.
Heat syncope is a type of heat illness.
Heat syncope occurs in a warm environment when blood pressure is lowered as the body dilates (widens) arterioles (small blood vessels) in the skin to radiate heat. This condition occurs within five days of heat acclimatization, before the blood volume expands.  The result is less blood to the brain, causing light-headedness and fainting.
The basic treatment for heat syncope is like that for other types of fainting: the patient is positioned in a seating or supine position with legs raised. Water is administered slowly, and the patient is moved to a cooler area.
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