Heat stroke is the most serious heat-related illness. It occurs when the body becomes unable to control its temperature: the body's temperature rises rapidly, the sweating mechanism fails, and the body is unable to cool down. Body temperature may rise to 106°F or higher within 10 to 15 minutes.

What does a heat stroke feel like?

In heatstroke brought on by hot weather, your skin will feel hot and dry to the touch. However, in heatstroke brought on by strenuous exercise, your skin may feel dry or slightly moist. Nausea and vomiting. You may feel sick to your stomach or vomit.

How long does a heat stroke last?

Initial recovery takes about 1-2 days in the hospital; longer if organ damage is detected. Experts suggest that complete recovery from heat stroke and its effects on the internal organs may take 2 months to a year.