In short hypothalamus does not rest content till it has raised body temperature up to the required level. (Sometimes up to 39° Celsius or 102.2° Fahrenheit). This results in body fever.
Keep in mind that this process is entirely natural. Further, it is also beneficial to the body because (1) the guard like T-cells perform their tasks more effectively in 38° to 40° Celsius temperature, (2) as the viruses can not bear heat beyond certain limit they get exterminated, and (3) bacteria require iron mineral content of the blood for re-production and as the circulation of iron constituent is reduced during fever their proliferation is automatically reduced.
Viewed in the light of above factors fever up to 39° Celsius is not illness but it is the body’s response to the illness. It is a counter attack on the viruses and bacteria. After the extermination of infection hypothalamus brings body temperature back to normal level.
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