What is considered a fever in terms of body temperature elevation?

A fever is classified as an elevation in body temperature above the normal range, which is typically around 98.6°F (37°C) but can vary slightly from person to person. When the body temperature rises, it is an indication that the body is responding to an infection or illness, activating the immune system’s response. This elevated temperature is part of the body’s defense mechanism, as many pathogens cannot survive at higher temperatures.

The other options do not accurately describe a fever. A decrease in temperature or a sudden drop would indicate hypothermia or other medical issues, and a normal body temperature indicates that the body is functioning properly without fever, thus not relevant to the definition of a fever. Understanding this distinction is crucial for recognizing symptoms of illness and providing appropriate care.