It helps to understand what a fever is. Some of the answers on here are very misleading, and aren't factual at all.
A fever occurs when the body increases in temperature. Most common cause of this is an infection of some kind. The White blood cells that eat the infection, release chemicals that go to the brain and tell it to raise the temperature of the body. The brain has a set point for our temperature, 98.6F. It is like a central heating/cooling system with a thermostat in a house. If the temp gets hot, the A/C turns on. If it gets to cold the Heater kicks on. And the temperature stays at 98.6F. What these chemicals from the white blood cells do, is they increase the thermostat. So the brain now has a set point of 101 F. But the body is still 98.6 F. So the heater kicks on. You get shivers, moving of muscles fast makes heat. You feel cold and you get under covers to get warm. This is why people say they are so cold when their temp is 100, because the thermostat is set to 101 or higher.
The body does this because some of the bodies defenses are activated at higher temperatures and some bacteria don't function well at higher temperatures. So they die or we kill them better with a higher temperature.
So what is it when a fever "breaks"?
Well eventually your white blood cells kill everything and they stop releasing those chemicals that changes the thermostat. So the thermostat changes back to 98.6F. Now you have a temperature of 101F and your body is set to 98.6F. It is too HOT. Turn on the A/C. So you start sweating, to cool yourself off. This is a fever "breaking".
So when the person with the fever is sweating like there is no tomorrow it is a good thing, and you can probably expect the fever to start going back down.
Fever is a natural defense mechanism against foreign invaders of your body. It is very normal. As long as my fever isn't over 102F, it makes sense to me to not interfere with the natural process. Even help it. If I'm running a little fever, I'll get in the hot tub or a nice hot bath. Fevers can be very dangerous and you should ask your doctor when those dangerous temperatures are. They are different for kids and adults.
To answer the question the fastest easiest way to break a fever is with anti-inflammatory medications like Tylenol and Motrin. But that doesn't mean everything is all better.
And by the way: WATER IS ZERO CALORIES! (in case you read the other post) Don't believe any of that stuff.
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