Heat stroke is a form of hyperthermia in which the body temperature is elevated dramatically. The cause of heat stroke is an elevation in body temperature, often accompanied by dehydration. The symptoms seen in heat stroke are: - confusion - agitation - disorientation - absence of sweating - coma Heat stroke is a medical emergency and can be fatal if not promptly and properly treated. Heat stroke is treated by cooling the victim, which is a critical step in the treatment of heat stroke. Always notify emergency services immediately if heat stroke is suspected. The most important measures to prevent heat strokes are to avoid becoming dehydrated and to avoid vigorous physical activities in hot and humid weather. So stay hydrated and aim at drinking 3 liters of water per day and apply ice over areas such as the forehead,neck, armpits and groin(in men).