Signs of Heat Stroke.
Heat stroke occurs when the body’s heat-regulating system fails to work properly due to high temperature. Potential heat stroke symptoms include having a body temperature of 104 degrees Fahrenheit (40 degrees Celsius) or higher, confusion, irritability, becoming red or flushed, nausea, vomiting, rapid breathing, headache, rapid heart rate, seizures, and becoming comatose.
Mayo Clinic, August 2015