A fever is a temperature of 100.4 F degrees and higher.

The body has several ways to maintain normal body temperature. The organs involved in helping with temperature regulation include the brain, skin, muscle, and blood vessels.

The body responds to changes in temperature by:

  • increasing or decreasing sweat production.
  • moving blood away from, or closer to, the surface of the skin.
  • getting rid of, or holding on to, water in the body.
  • naturally wanting to seek a cooler or warmer environment.