What is defined as an abnormally high core body temperature above 38 degrees Celsius?

The term that describes an abnormally high core body temperature above 38 degrees Celsius is hyperthermia. This condition occurs when the body's heat-regulating mechanisms are overwhelmed, often due to excessive heat exposure, intense physical activity, or an inability to dissipate heat effectively. Hyperthermia can lead to serious health complications such as heat exhaustion or heat stroke if not addressed promptly. It is distinct from other terms like fever, which is a medically recognized increase in body temperature due to infection or illness, and not all elevations in temperature are classified as hyperthermia. Hypothermia, on the other hand, refers to dangerously low body temperature, and shock generally describes a state of inadequate blood flow to the organs rather than a temperature-related condition.