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    What is a fever?

    Updated on 2017-09-05

    Fever happens when the body's internal ““thermostat”” raises the body temperature above its normal level. This thermostat is located in your brain.

    Internal Thermostat

    The part of your brain that regulates this is called the hypothalamus. It knows what temperature your body should be (usually around 98.6 °F/37 °C) and will send messages to your body to keep it that way. Most people's body temperatures change a little bit during the course of the day. It's usually a little lower in the morning and a little higher in the evening. In kids it can vary as they run around, play, and exercise. Sometimes, though, the hypothalamus will ““reset”” the body to a higher temperature in response to an infection, illness, or some other cause.

    The information on this page applies to the following models: SCH740/21 .

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