Shivering

Shivering is a bodily function in response to cold and extreme fear in warm-blooded animals. When the core body temperature drops, the shivering reflex is triggered to maintain homeostasis. Skeletal muscles begin to shake in small movements, creating warmth by expending energy.

Shivering can also be a response to fever, as a person may feel cold.
During fever, the hypothalamic set point for temperature is raised.
The increased set point causes the body temperature to rise (pyrexia), but also makes a person feel cold until the new set point is reached.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY 2.0

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