Heatstroke is the most severe form of heat-related problems, often resulting from exercise / heavy work in hot & humid environments combined with inadequate fluid intake. Young children, older adults, people who are obese are at high risk of heatstroke. In heat stroke 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 more than 104 F (40 C). There are changes in mental status ranging from personality changes to confusion and coma. Skin may be hot and dry ? although if heatstroke is caused by exertion, the skin may be moist. Other signs are rapid heart rate, rapid and shallow breathing, high or low blood pressure, irritability or confusion, feeling light headed, headache, nausea, and fainting. If you suspect heatstroke: Move the person out of the sun and into a shady or air-conditioned space. Cool the person by covering him / her with damp sheets or by spraying with cool water. Blow air on to him with a fan or news paper. Provide the person with water if he/ she are able to drink. Call for medical help immediately/ transport the victim to the nearest hospital. Prevention will be the key: avoid travelling in the day time, take plenty of fluids, and always carry water with you if you have to travel during the day. Wear light shaded clothes, since they do not absorb heat, hence prevent dehydration.