What medical term is opposite of hyperthermia?

The medical term opposite of hyperthermia is hypothermia. Hyperthermia refers to a condition where the body temperature rises above normal, typically due to exposure to extreme heat or a malfunction in the body's temperature regulation system. Hypothermia, on the other hand, refers to a condition where the body temperature drops below normal, often caused by exposure to severely cold environments, immersion in cold water, or certain medical conditions.