Normal body temperature varies during the day. It is generally lowest upon awakening in the morning. Food, extra clothing, excitement , and anxiety can all raise the body temperature. Strenuous exercise can temporarily raise body temperature to as high as 103 degrees Fahrenheit. Menstrual cycles in women can also elevate temperature by 1 degree or more.
Most children have higher body temperatures than adults and seem to have more daily variation.
Many infants and children develop high fevers, even with minor viral illnesses. A high fever does not directly cause brain damage. However, febrile seizures can occur in some children, and the seizure can cause injury to the child. A heat stroke can result from too much exercise without water or salt, and temperature can rise to 106 degrees Fahrenheit. Most are eventually found to be caused by a hidden infection.