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Consequently, each type of measurement has a range of normal temperatures. The range for normal human body temperatures, taken orally, is 36.8 ± 0.5 °C (98.2 ± 0.9 °F). [12] This means that any oral temperature between 36.3 and 37.3 °C (97.3 and 99.1 °F) is likely to be normal. [13] The normal human body temperature is often stated as 36. ...
Normal body temperatures vary depending on many factors, including age, sex, time of day, ambient temperature, activity level, and more. [37] [38] Normal daily temperature variation has been described as 0.5 °C (0.9 °F). [7]: 4012 A raised temperature is not always a fever. [37]
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]
The thermally neutral air temperature for an unprotected resting human is about 28 °C (82 °F), and the thermally neutral temperature in water is about 35 °C (95 °F), much closer to normal body temperature. This difference is due to the very different physical properties of the media.
Trench foot or immersion foot: a condition caused by repetitive exposure to water at non-freezing temperatures [11] The normal human body temperature is often stated as 36.5–37.5 °C (97.7–99.5 °F). [13] Hyperthermia and fevers are defined as a temperature of greater than 37.5–38.3 °C (99.5–100.9 °F). [8]
Hay fever is not a true fever, meaning it does not cause a core body temperature in the fever over 37.5–38.3 °C (99.5–100.9 °F). [ citation needed ] Cause
Fever of unknown origin (FUO) refers to a condition in which the patient has an elevated temperature for which no cause can be found despite investigations by one or more qualified physicians. [ 1 ] [ 2 ] [ 3 ] If the cause is found, it is usually a diagnosis of exclusion , eliminating all possibilities until only the correct explanation remains.
Satisfaction with the thermal environment is important because thermal conditions are potentially life-threatening for humans if the core body temperature reaches conditions of hyperthermia, above 37.5–38.3 °C (99.5–100.9 °F), [11] [12] or hypothermia, below 35.0 °C (95.0 °F). [13]