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In humans, hyperthermia is defined as a temperature greater than 37.5–38.3 °C (99.5–100.9 °F), depending on the reference used, that occurs without a change in the body's temperature set point. [3] [10] The normal human body temperature can be as high as 37.7 °C (99.9 °F) in the late afternoon. [2]
On the other hand, a "normal" temperature may be a fever, if it is unusually high for that person; for example, medically frail elderly people have a decreased ability to generate body heat, so a "normal" temperature of 37.3 °C (99.1 °F) may represent a clinically significant fever.
] Elderly people may have a decreased ability to generate body heat during a fever, so even a somewhat elevated temperature can indicate a serious underlying cause in geriatrics. One study suggested that the average body temperature has also decreased since the 1850s. [ 18 ]
The cause of the fevers is often a viral illness. [1] The likelihood of a febrile seizure is related to how high the temperature reaches. [1] [6] Some feel that the rate of increase is not important [1] while others feel the rate of increase is a risk factor. [17] This latter position has not been proven. [17]
Pyrotherapy (artificial fever) is a method of treatment by raising the body temperature or sustaining an elevated body temperature using a fever. In general, the body temperature was maintained at 41 °C (105 °F). [1] Many diseases were treated by this method in the first half of the 20th century.
“There’s a process of inflammation that occurs when the body has an infection, and some of the inflammatory mediators that we use to fight the infection cause fever and body aches,” says ...
“The infection might only be in one part of the body and not affect the core temperature enough to cause a fever,” Cohan says. “Other things, like how sensitive each person is to temperature ...
A 2022 Outside article on heat stroke cites the highest known body temperature that a human was able to survive: “The highest body temperature measured was only 17 degrees above normal. Willie ...