Heat Fainting Underlying Cause
Heat syncope is caused by exposure to a hot environment, usually for a prolonged period. The body cools itself by increasing blood flow to the skin, where heat is released into the environment. This shift of blood flow reduces the amount of blood flowing to other parts of the body, including the brain. If the blood flow to the brain is reduced too much, the brain stops functioning, which results in fainting. Heat syncope is more common in those who are dehydrated.
- Booker RJ, Bricknell MC. Heat illness--recent developments. J R Army Med Corps. 2002 Mar;148(1):11-8. 
- Bytomski JR, Squire DL. Heat illness in children. Curr Sports Med Rep. 2003 Dec;2(6):320-4. 
- Coris EE, Ramirez AM, Van Durme DJ. Heat illness in athletes: the dangerous combination of heat, humidity and exercise. Sports Med. 2004;34(1):9-16. 
- Lugo-Amador NM, Rothenhaus T, Moyer P. Heat-related illness. Emerg Med Clin North Am. 2004 May;22(2):315-27, viii.