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At What Body Temperature Do You Have a Fever?

A:

Quick Answer

An oral temperature of more than 100.4 degrees Fahrenheit is considered to be a fever, according to WebMD. A normal body temperature is approximately 98.6 degrees Fahrenheit, which may vary by 1 degree from individual to individual and can change depending on various factors, such as physical activity.

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WebMD explains that fevers can be caused by infections; certain medications that specifically raise body temperature; other medications that impair the body's ability to regulate body temperature; severe trauma or injury; and other conditions, including arthritis, hyperthyroidism, and certain forms of cancer. An abnormally high body temperature called heatstroke can occur as a result of exposure to heat or excessive physical exertion.

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