why do we feel cold when we are sick

Asked by: Jim Taylor, Spain
A fever is when your body increases its internal thermostat, found in the hypothalamus. If you exercise hard or its a hot day, your body temperature might increase, but the thermostat remains at around 36. 8`C. When you feel hot the hypothalamus tries to correct this with sweating and increased blood flow to the skin.

With a fever, it is actually the thermostat that has adjusted. This means your body temperature is now below 36. 8`C, so you feel cold and shiver, to try and raise your temperature. The higher body temperature may help fight infection by speeding white blood cell production and slowing bacteria reproduction.

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