Ask An Explainer; About the Exhibit; How Things Fly Smithsonian National Air and Space Museum
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.
Sometimes the cause of a fever can't be identified. If you have a temperature of 101 F (38.3 C) or higher for more than three weeks and your doctor isn't able to find the cause after extensive evaluation, the diagnosis may be fever of unknown origin.1  Symptoms.2  Complications.actors such as your menstrual cycle or heavy exercise can affect your temperature. Fever or elevated body temperature might be caused by: 1  A virus. 2  A bacterial infection.