What makes heatstroke severe and potentially life-threatening is that the body's normal mechanisms for dealing with heat stress, such as sweating and temperature control, are lost. The main sign of heatstroke is a markedly elevated body temperature — generally greater than 104 F— with changes in mental status ranging from personality changes to confusion. Skin may be hot and dry, although if heatstroke is caused by exertion, the skin may be moist.Other signs and symptoms may include rapid heartbeat, shallow breathing, elevated or lowered blood pressure, cessation of sweating, feeling dizzy, headache, nausea, and fainting. If you suspect heatstroke, move the person to a cool area and call 911. If able, have the person drink cool water.

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