What is a description of fever?

Fever is a temporary increase in body temperature, often due to an illness or infection. It typically occurs when the body’s immune response is activated, signaling the brain to raise the set point of body temperature. Fever is usually defined as a body temperature above 100.4°F (38°C) and can be accompanied by symptoms such as chills, sweating, headache, and muscle aches. While it can be uncomfortable, fever is generally a natural defense mechanism that helps the body fight off pathogens.