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In page Hyperthermia:

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Hyperthermia, also known simply as overheating, is a condition in which an individual's body temperature is elevated beyond normal due to failed thermoregulation. The person's body produces or absorbs more heat than it dissipates. When extreme temperature elevation occurs, it becomes a medical emergency requiring immediate treatment to prevent disability or death.[citation needed] Almost half a million deaths are recorded every year from hyperthermia.[citation needed]