Fever (also known as pyrexia) is a common medical sign characterized by an elevation of body temperature above the normal range of due to an increase in the temperature regulatory set-point. This increase in set-point triggers increased muscle tone and shivering.
As a person's temperature increases, there is, in general, a feeling of cold despite an increasing body temperature. Once the new temperature is reached, there is a feeling of warmth. A fever can be caused by many different conditions ranging
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