It is a condition caused by overheating of body, usually as a result of prolonged exposure to or physical exertion in high temperatures. Heatstroke can occur if your body temperature rises to 104 F (40 C) or higher.
High body temperature. A body temperature of 104 F (40 C) or higher is the main sign of heatstroke.
Altered mental state or behavior. Confusion, agitation, slurred speech, irritability, delirium, seizures and coma can all result from heatstroke.
Alteration in sweating. 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 moist.
Nausea and vomiting
Flushed skin. Skin may turn red as your body temperature increases.
Rapid breathing. Breathing may become rapid and shallow.
Take immediate action to cool the overheated person while waiting for hospital transfer.
Get the person into shade or indoors.
Remove excess clothing.
Cool the person with whatever means available — put in a cool tub of water or a cool shower, sponge with cool water, fan while misting with cool water, or place ice packs or cold, wet towels on the person's head, neck, armpits and groin.