A fever (also termed pyrexia) is a higher-than-normal body temperature. It is a symptom caused by a wide variety of illnesses. Fevers may occur in anyone at any age; however, this article is specifically addressing fever in adults.
Every one of us has experienced the wave of chills and exhaustion that a fever causes. Fever usually occurs in response to an infection as with the flu or cold viruses or strep throat bacterial infection, or with inflammation that occurs with tissue injury or disease (such as with some cancers).