<unk>  is defined as a body core temperature below in humans. Symptoms depend on the temperature. In mild<unk> , there is shivering and mental confusion. In moderate<unk> , shivering stops and confusion increases. In severe<unk> , there may be hallucinations and paradoxical undressing, in which a person removes their clothing, as well as an increased risk of the heart stopping.<unk>  has two main types of causes. It classically occurs from exposure to cold weather and cold water immersion. It may also occur from any condition that decreases heat production or increases heat loss. Commonly, this includes alcohol intoxication but may also include low blood sugar, anorexia and advanced age. Body temperature is usually maintained near a constant level of through thermoregulation. Efforts to increase body temperature involve shivering, increased voluntary activity, and putting on warmer clothing.<unk>  may be diagnosed based on either a person's symptoms in the presence of risk factors or by measuring a person's core temperature. The treatment of mild<unk>  involves warm drinks, warm clothing, and physical activity. In those with moderate<unk> , heating blankets and warmed intravenous fluids are recommended. People with moderate or severe<unk>  should be moved gently. In severe<unk> , extracorporeal membrane oxygenation (ECMO) or cardiopulmonary bypass may be useful. In those without a pulse, cardiopulmonary resuscitation (CPR) is indicated along with the above measures. Rewarming is typically continued until a person's temperature is greater than . If there is no improvement at this point or the blood potassium level is greater than 12 mmol/liter at any time, resuscitation may be discontinued.<unk>  is the cause of at least 1,500 deaths a year in the United States. It is more common in older people and males. One of the lowest documented body temperatures from which someone with accidental<unk>  has survived is in a near-drowning of a 7-year-old girl in Sweden. Survival after more than six hours of CPR has been described. In individuals for whom ECMO or bypass is used, survival is around 50%. Deaths due to<unk>  have played an important role in many wars. The term is from Greek ὑπο, hupo, meaning "under", and θερμία, thermía, meaning "heat". The opposite of<unk>  is hyperthermia, an increased body temperature due to failed thermoregulation.
Hypothermia
Hyperthermia
Malignant hyperthermia
Hypocapnia
Alkaline tide
Hyperaemia
Hypoxemia
Acidosis