You searched for: “hyperthermia
hyperthermia
1. Therapeutically induced hyperpyrexia.
2. Characterized by excess heat; of very high temperature.
3. The condition of having a body temperature substantially above the normal either as a result of natural causes or artificially induced (e.g. for therapeutic purposes).
hyperthermia, hypothermia
hyperthermia (high" puhr THUR mee uh) (noun)
Unusually high body temperature: The doctors were worried because the patient seemed very hot as if suffering from hyperthermia.
hypothermia (high" puh THUR mee uh) (noun)
Abnormally low body temperature: People who enjoy hiking in the winter need to be very careful that they don't develop hypothermia and frostbite.

The doctors were very worried about Josie's well-being because her temperatures kept fluctuating between hyperthermia and hypothermia without a medical explanation.