6 Signs and Symptoms of Heat Stroke

Heat stroke is a potentially life-threatening condition that requires immediate medical treatment. Learn the signs and symptoms of heat stroke as well as first aid strategies and tips for prevention.
A woman suffering from heat in the desert.
Source: Bigstock
Reviewed by Charles Patrick Davis, MD, PhD on August 9, 2013

Heat Stroke Definition

Heat stroke is the dangerous condition that results when your body can't regulate your temperature. Core body temperature reaches 106°F or higher when heat stroke occurs (usually with neurologic dysfunction). Heat stroke is a medical emergency that can lead to serious disability or even death.

There are two types of heat stroke: exertional and nonexertional. Exertional heat stroke is brought on by doing physical activity in the heat. Nonexertional heat stroke is not brought on by physical activity. It's caused by being in a hot environment (often humid) for long periods of time.


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