Are there any medical conditions, besides death or exposure to cold, which result in an abnormally low body temperature? If so, is there a special term for this symptom besides hypothermia?
Addison’s Disease (Hypoadrenocorticism), Hypomagnasaemia and Hypocalcaemia may all cause a relative hypothermia (in animals, anyway, but I’d guess the physiological mechanism would work the same for humans)
Hypothermia is the only term I know of.
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IANAD or a scientist, just speaking from personal experience. One of my children, when ill with some relatively mild illness, would sometimes have a body temperature a degree or two below normal, as if running a slight “reverse fever.” The pediatrician said this was an occasional reaction that a person’s system might do in trying to fight off a virus by altering the normal body temperature to one that the virus did not tolerate. It was harmless and went away in a couple of days. I don’t know if this qualifies as “hypothermia.” It was certainly “abnormally low” in the sense that it was lower than was normal for her, but it was not the sort of abnormally low that happens from overexposure to a hostile environment.