Heat stroke is the most serious heat-related illness and happens when the body loses its ability to sweat.
The skin gets hot and red, and the pulse quickens as the person's body temperature climbs to 103 F or higher. Headaches set in, along with nausea, confusion and even fainting.
In the case of heat stroke, experts suggest calling 911 and trying to lower the person's body temperature with cool, wet cloths or a cool bath. During extreme heat events, one of the most common ways people can die is from cardiovascular collapse, experts said, because of the extra energy the heart has to expend to help the body compensate for the hot temperatures.
"A lot of research that I and my colleagues do is just really focused on understanding how people are responding to higher levels of extreme heat over longer periods of time and then what we can do about it," said Jenni Vanos, an associated professor at ASU's School of Sustainability.
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