What is the exact cause of increased body temperature in fever?

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In response to an infection, illness, or some other cause, the hypothalamus may reset the body to a higher temperature. Although the most common causes of fever are common infections such as colds and gastroenteritis, other causes include: Infections of the ear, lung, skin, throat, bladder, or kidney. A fever begins when your immune system makes more white blood cells to fight an infection. The increase in white blood cells triggers your brain to heat your body up. This causes a fever. In response, your body tries to cool itself off by tightening up on blood flow to your skin and contracting muscles.
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