Fever

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For other uses, please see Fever (disambiguation). This article or section recently underwent a major revision or rewrite and needs further review. You can help! A medical/clinical thermometer showing the temperature of 38.7 °C Fever (also known as pyrexia, or a febrile response from the Latin word febris meaning fever, and archaically known as ague) is a frequent medical symptom that describes an increase in internal body temperature to levels that are above normal (37°C, 98 ...