What is heat syncope?
A person with heat syncope suddenly faints or passes out during activities in a hot environment. 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.

What are the symptoms of heat syncope?
Symptoms of heat syncope include fainting, dizziness, dry mouth, excessive thirst, excessive sweating, fatigue, headache, nausea, and vomiting.

How does the doctor treat heat syncope?
Treatment of heat syncope includes removing clothing, a tepid water bath or sponge bath, oral fluids, intravenous fluids, cardiac monitoring, and rest in a cool environment.