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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.
A fever is an increase in your body temperature. Normal body temperature is 98.6Â°F (37Â°C). Fever is generally defined as greater than 100.4Â°F (38Â°C). The cause of your fever may not be known. This is called fever of unknown origin. It occurs when you have a fever above 100.9ËF (38.3Â°C) for 3 weeks or more. The following are common causes of fever: An infection caused by a virus or bacteria. An inflammatory disorder, such as arthritis. A brain infection or injury.