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Body temperature normals

Normal body temperature varies by person, age, activity, and time of day. The average normal body temperature is generally accepted as 98.6°F (37°C). Some studies have shown that the "normal" body temperature can have a wide range, from 97°F (36.1°C) to 99°F (37.2°C). 

A temperature over 100.4°F (38°C) usually means you have a fever caused by an infection or illness.

Body temperature normally changes throughout the day.

Alternative Names

Normal body temperature; Temperature - normal


Mackowiak PA. Temperature regulation and the pathogenesis of fever. In: Mandell GL, Bennett JE, Dolin R, eds.Principles and Practice of Infectious Diseases

Sullivan JE, Farrar HC, Section on Clinical Pharmacology and Therapeutics, Committee on Drugs. Fever and antipyretic use in children. Pediatrics.

Update Date 1/22/2013