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The normal temperature inside your childâs body is usually around 37 degrees Celsius. Your child has a mild fever if their temperature is higher than 38 degrees Celsius. A high fever usually means more than 39 degrees Celsius.
Fever is most often a symptom of an infection but can also be caused by inflammatory conditions, thyroid disease, cancer, vaccines and some drugs. Temperature is regulated by a small gland located in the center of the brain, the hypothalamus. The thyroid gland also plays a role in body temperature.