Moderate: No shivering, increased confusion 
Severe: Paradoxical undressing,
||Based on symptoms or
|Treatment||Mild: Warm drinks, warm clothing, physical activity
Moderate: Heating blankets, warmed
|Deaths||1,500 per year (US) |
Hypothermia is reduced body temperature that happens when a body dissipates more heat than it absorbs. In humans, it is defined as a body
Hypothermia has two main types of causes. It classically occurs from exposure to extreme cold.
 It may also occur from any condition that decreases heat production or increases heat loss.
 Commonly this includes
The treatment of mild hypothermia involves warm drinks, warm clothing, and physical activity.
 In those with moderate hypothermia, heating blankets and warmed
Hypothermia 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 hypothermia has survived is 13.0 °C (55.4 °F) in a near-drowning of a 7-year-old girl in Sweden.
 Survival after more than six hours of CPR has been described.
 For those for whom ECMO or bypass is used, survival is around 50%.
 Deaths due to hypothermia have played an important role in many wars.
 The term is from
|Swiss system ||Symptoms||By degree ||Temperature|
|Stage 1||Awake and shivering||Mild||32–35 °C (89.6–95.0 °F)|
|Stage 2||Drowsy and not shivering||Moderate||28–32 °C (82.4–89.6 °F)|
||Severe||20–28 °C (68.0–82.4 °F)|
||Profound||<20 °C (68.0 °F)|
Another classification system, the Swiss staging system, divides hypothermia based on the presenting symptoms which is preferred when it is not possible to determine an accurate core temperature. 
Other cold-related injuries that can be present either alone or in combination with hypothermia include: