Fever (also known as pyrexia) is one of the most common medical signs and is characterized by an elevation of body temperature above the normal range of 36.5–37.5 °C (98–100 °F) due to an increase in the temperature regulatory set-point. This increase in set-point triggers increased muscle tone and shivering.

As a person's temperature increases, there is, in general, a feeling of cold despite an increasing body temperature. Once the new temperature is reached, there is a feeling of warmth. A fever can be caused by many different conditions ranging from benign to potentially serious. There are arguments for and against the usefulness of fever, and the issue is controversial. With the exception of very high temperatures, treatment to reduce fever is often not necessary; however, antipyretic medications can be effective at lowering the temperature, which may improve the affected person's comfort.

Fever differs from uncontrolled hyperthermia, in that hyperthermia is an increase in body temperature over the body's thermoregulatory set-point, due to excessive heat production and/or insufficient thermoregulation.

Read more about Fever:  Definition, Signs and Symptoms, Differential Diagnosis, Pathophysiology, Management, Epidemiology, History, In Other Animals

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Famous quotes containing the word fever:

    When I was very young and the urge to be someplace was on me, I was assured by mature people that maturity would cure this itch. When years described me as mature, the remedy prescribed was middle age. In middle age I was assured that greater age would calm my fever and now that I am fifty-eight perhaps senility will do the job. Nothing has worked.... In other words, I don’t improve, in further words, once a bum always a bum. I fear the disease is incurable.
    John Steinbeck (1902–1968)

    Y’know Pete, back where I come from folks call that love stuff “quick poison” or “slow poison.” If it’s quick poison it hurts you all over real bad like a shock of electricity. But if it’s slow poison, well, it’s like a fever that aches in your bones for a thousand years.
    Dalton Trumbo (1905–1976)