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Hypothermia is something you want to be aware of if you're trekking in Iceland. It occurs when the body loses heat faster than it can produce it and the core temperature of the body falls. It is frighteningly easy to progress from very cold to dangerously cold due to a combination of wind, wet clothing, fatigue and hunger, even if the air temperature is above freezing. If the weather deteriorates, put on extra layers of warm clothing immediately: a windproof and/or waterproof jacket, plus wool or fleece hat and gloves, are all essential. Have something energy-giving to eat and ensure that everyone in your group is fit, and feeling well and alert. Symptoms of hypothermia are exhaustion, numb skin (particularly toes and fingers), shivering, slurred speech, irrational or violent behaviour, lethargy, stumbling, dizzy spells, muscle cramps and violent bursts of energy. Irrationality may take the form of sufferers claiming they are warm and trying to take off their clothes. To treat mild hypothermia, first get the person out of the wind and/or rain, remove their clothing if it's wet and replace it with dry, warm clothing. Give them hot liquids - not alcohol - and some high-energy, easily digestible food. Do not rub victims: instead, allow them to slowly warm themselves. This should be enough to treat the early stages of hypothermia. The early recognition and treatment of mild hypothermia is the only way to prevent severe hypothermia, which is a critical condition.
