The risk of heat-related illnesses and deaths increases during warm summer months; humidity increases the risk. Heat stroke is the most serious heat-related illness. It occurs when the body becomes unable to control its temperature: body 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. Heat stroke can cause death or permanent disability if emergency treatment is not provided. [June 2012, 407 word article]