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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]
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]
The temperature reading depends on which part of the body is being measured. The typical daytime temperatures among healthy adults are as follows: Temperature in the rectum (rectal), vagina, or in the ear (tympanic) is about 37.5 °C (99.5 °F) [20] [medical citation needed] Temperature in the mouth (oral) is about 36.8 °C (98.2 °F) [12]
“You can feel feverish without having a temperature, but you cannot clinically have a fever without a temperature above 100.4 degrees Fahrenheit by mouth,” says Eric Ascher, D.O., family ...
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.
Heat intolerance is a symptom characterized by feeling overheated in warm environments or when the surrounding environment's temperature rises. [1] Typically, the person feels uncomfortably hot and sweats excessively.
The defect is typically located on the long arm of chromosome 19 (19q13.2 [10]) involving the ryanodine receptor. [5] More than 25 different mutations in this gene are linked with malignant hyperthermia. [5] These mutations tend to cluster in one of three domains within the protein, designated MH1-3.
Heat stroke or heatstroke, also known as sun-stroke, is a severe heat illness that results in a body temperature greater than 40.0 °C (104.0 °F), [4] along with red skin, headache, dizziness, and confusion. [2]