When a person is losing a lot of sweat from heat, not able to keep up with the body's demand to maintain homeostasis, to maintain itself, [it can lead to] heat exhaustion [or] the more serious kind of the heat exhaustion then can lead to heat stroke, says Dr. Jerome Cohen, president of the Medical Society of the State of New York.
Heat kills more people than hurricanes, tornadoes, or other natural disasters. Some 1,220 people in the U.S. die every year because of extreme heat, according to the Centers for Disease Control and Prevention (CDC).
Signs and symptoms Heat-related illnesses occur when the temperature of the body rises so rapidly that it cannot cool itself down. Heat exhaustion usually happens before heat stroke, though Cohen says that heat stroke can also happen on its own.
Heat exhaustion happens due to dehydration. Sweat is the way the body tries to get the temperature down. But they're sweating so much, it's just not keeping up with demand, says Cohen. Excessive sweating causes the body to lose water and electrolytes.
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