Most healthcare providers consider a fever to be 100.4°F (38°C) or higher. High fevers may bring on seizures or confusion in children. It’s not how high the temperature is, but how fast the temperature goes up that causes a seizure. A fever has other symptoms besides a higher-than-normal temperature.

What exactly is a fever?

A fever is a body temperature that is higher than normal. A normal temperature can vary from person to person, but it is usually around 98.6 °F (37 °C). A fever is not a disease. It is usually a sign that your body is trying to fight an illness or infection. Infections cause most fevers.

What is fever According to who?

The 42 Code of Federal Regulations parts 70/71 Final Rule defines an ill person as someone who: Has a fever (has a measured temperature of 100.4 °F [38 °C]† or greater, or feels warm to the touch, or gives a history of feeling feverish) accompanied by one or more of the following: skin rash. difficulty breathing.