Fever is the body's normal response to infection and other
conditions, both minor and serious. Most fevers help the body fight
The average normal body temperature is
98.6°F (37°C) orally. It can
change during the day from a low of
97.4°F (36.3°C) in the morning
to a high of 99.6°F (37.6°C) in
the late afternoon. Mild elevations—(99.8°F (37.7°C)— can be caused by too much clothing, a hot bath, or
Fever in a child is
present when a child's temperature is
100.4°F (38°C) or higher
William H. Blahd, Jr., MD, FACEP - Emergency Medicine & H. Michael O'Connor, MD - Emergency Medicine
How this information was developed to help you make better health decisions.
The Health Encyclopedia contains general health information. Not all treatments or services described are covered benefits for Kaiser Permanente members or offered as services by Kaiser Permanente. For a list of covered benefits, please refer to your Evidence of Coverage or Summary Plan Description. For recommended treatments, please consult with your health care provider.