Hypothermia is when the core body temperature drops below 35ºC. The core temperature is the temperature of the heart, lung, brain and splanchnic organs. When hypothermia is not treated quickly, there may be some complications, such as tissue freezing (and even death), but it is not correct to say that hyperthermia is tissue freezing.
The major cause of the disease is intense exposure to cold without appropriate clothing or full or partial immersion in frozen water. However, there are other causes for hypothermia, as well as risk groups more susceptible to contracting the disease.
