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If you mean positive feedback in the biological sense of the body's response to change, a fever is positive feedback because it's very presence causes it's increase.

Positive feedback is when a change in the environment of your body triggers a reaction which increases the change. It is often dangerous but somtimes useful eg during childbirth.

When you have a fever, your body also thinks you have hypothermia (extremely cold) so it attempts to warm you up. (which It does this by constricting surface capillaires cuts of blood supply to areas in which it would cool), shivering and an increased muscle tone. These changes cause the body to heat up more, thus increasing the severity of the fever itself.

Hope that makes sense :) I learnt that today believe it or not XD

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Q: Why is a fever positive feedback?
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