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Simply put, heat stroke is when your body’s ability to tolerate the heat is surpassed.
The elderly are typically most at risk because aging bodies aren’t as able to efficiently produce sweat to cool off, and certain medications taken for chronic conditions, including heart medicines, make it harder for the body to regulate temperature, said Dr. Andrew Ulrich, executive vice chair of emergency medicine at Boston Medical Center.
But plenty of others, including those exercising in extreme heat and the homeless, run into problems, too, Ulrich said.