Mechanism of fever in humans

Fever usually occurs when a virus or bacterium enters the body. The immune system then produces pyrogen, deceiving the brain area to control body temperature, making it feel like the body temperature is low.

The brain reacts like any other warm-blooded animal, by pushing the thermostat to a few steps. Blood flows to the body, warming the whole body but cold at the surface - thus causing chills. The metabolic rate is increased and the muscles contract.

The goal of the immune system is to promote chemical reactions to create antibodies against disease, stimulate the activity of white blood cells and prevent the invading bacteria from multiplying.

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