When you're sick with a fever, your doctor will likely tell you it's a sign that your immune system is defending you against an infection. Fever typically results from immune cells at infected sites sending chemical signals to the brain to raise the set point of your body's thermostat. So, you feel chills when the fever starts and feel hot when the fever breaks.
, but they could when combined. The stress of heat doesn't act alone when controlling infections.
The standard view that the heat of fever kills pathogens and enhances immune responses is correct but incomplete. Fever's ability to control infections comes from the few extra, but critical, degrees it adds to enhance existing locally generated heat to harm vulnerable growing pathogens. And fever also always acts with other defenses, never alone., fever is an ancient feature of life on this planet that deserves respect.
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