Human body temperature

Normal human body temperature (normothermia, euthermia) is the typical temperature range found in humans. The normal human body temperature range is typically stated as 36.5–37.5 °C (97.7–99.5 °F).

Temperature classification
Core (rectal, esophageal, etc.)
Hypothermia <35.0 °C (95.0 °F)
Normal 36.5–37.5 °C (97.7–99.5 °F)
Fever >37.5 or 38.3 °C (99.5 or 100.9 °F)
Hyperthermia >37.5 or 38.3 °C (99.5 or 100.9 °F)
Hyperpyrexia >40.0 or 41.0 °C (104.0 or 105.8 °F)
Note: The difference between fever and hyperthermia is the underlying mechanism. Different sources have different cut-offs for fever, hyperthermia and hyperpyrexia.

Human body temperature varies. It depends on sex, age, time of day, exertion level, health status (such as illness and menstruation), what part of the body the measurement is taken at, state of consciousness (waking, sleeping, sedated), and emotions. Body temperature is kept in the normal range by a homeostatic function known as thermoregulation, in which adjustment of temperature is triggered by the central nervous system.

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