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By definition, any temperature over 100.4 degrees Fahrenheit (38 Celcius) is a fever.

The significance of a fever is highly variable, however. The height of the fever is very rarely significant, unless it is above 105 to 106 degrees. Viral illnesses are the most common causes of fever, but there are many causes, depending on the person, their age, and their other medical problems.

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Q: Should you worry about a temperature of 101.5?
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