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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]
Other circumstances also affect the body's temperature. The core body temperature of an individual tends to have the lowest value in the second half of the sleep cycle; the lowest point, called the nadir, is one of the primary markers for circadian rhythms. The body temperature also changes when a person is hungry, sleepy, sick, or cold.
Heat illness is a spectrum of disorders due to increased body temperature. It can be caused by either environmental conditions or by exertion.It includes minor conditions such as heat cramps, heat syncope, and heat exhaustion as well as the more severe condition known as heat stroke. [1]
Essentially, dehydration may lead to hyperthermia because overheating can alter your body’s normal temperature. (See more about your body's response to heat and what happens when you sweat here.) 5.
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. [20] [21] The normal human body temperature can be as high as 37.7 °C (99.9 °F). [24]
Hyperthermia can set in when the core body temperature rises above 37.5–38.3 °C (99.5–100.9 °F). [3] [4] Humans have adapted to living in climates where hypothermia and hyperthermia were common primarily through culture and technology, such as the use of clothing and shelter. [5]
Heat stroke, which killed Asuncion Valdivia, is a particularly deadly form of hyperthermia that occurs when the body is overwhelmed by heat and is unable to control its temperature.
Hyperthermia is an elevation of body temperature over the temperature set point, due to either too much heat production or not enough heat loss. [1] [7] Hyperthermia is thus not considered fever. [7]: 103 [40] Hyperthermia should not be confused with hyperpyrexia (which is a very high fever). [7]: 102