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Hyperthermia: Causes, Symptoms and Treatment
Hyperthermia is a dangerous rise in body temperature above 37.5–38 °C that overwhelms the body's cooling mechanisms. It can become life-threatening and requires prompt medical attention.
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Hyperthermia is a dangerous rise in body temperature above 37.5–38 °C that overwhelms the body's cooling mechanisms. It can become life-threatening and requires prompt medical attention.
What Is Hyperthermia?
Hyperthermia refers to a condition in which the core body temperature rises above the normal range of approximately 37 °C and the body's heat-regulating mechanisms are overwhelmed. Unlike fever, which is caused by a deliberate upward shift in the temperature set-point in the brain, hyperthermia results from excessive external heat exposure or excessive internal heat production without a corresponding regulatory adjustment. Serious organ damage can occur at temperatures above 40 °C, and temperatures of 41–42 °C are immediately life-threatening.
Causes
Hyperthermia can be triggered by a variety of factors:
- External heat exposure: Being in a hot environment (e.g., during summer heat waves, saunas, or inside hot vehicles)
- Physical overexertion: Intense athletic activity or heavy physical labor in high temperatures (exertional hyperthermia)
- Medications and substances: Certain drugs such as anticholinergics, amphetamines, MDMA, or antipsychotics can impair heat regulation
- Anesthetic-related causes: Malignant hyperthermia is a rare, genetically determined reaction to specific anesthetic agents
- Neurological conditions: Damage to the hypothalamus can impair central temperature regulation
- Increased metabolic activity: For example, in hyperthyroidism (thyrotoxicosis)
Symptoms
The symptoms of hyperthermia often develop in stages, ranging from mild discomfort to life-threatening conditions:
- Heat cramps: Painful muscle cramps caused by electrolyte loss through sweating
- Heat exhaustion: Heavy sweating, weakness, dizziness, nausea, headache, pale and moist skin
- Heat stroke: Body temperature above 40 °C, dry and hot skin, confusion, loss of consciousness -- a medical emergency
- Rapid heart rate and shallow breathing
- Muscle twitching or seizures
- Failure of vital organs (kidneys, liver, heart) in severe cases
Diagnosis
Hyperthermia is diagnosed clinically through measurement of the core body temperature and a thorough medical history. The following tests may be used for further evaluation:
- Rectal or tympanic temperature measurement for accurate core temperature assessment
- Blood tests (electrolytes, kidney function, liver enzymes, blood count) to assess organ damage
- ECG to monitor cardiac function
- Imaging procedures if neurological involvement is suspected
Treatment
Treatment of hyperthermia aims to reduce body temperature as quickly as possible and prevent organ damage:
Immediate Measures
- Move the affected person out of the heat and into a cool environment
- Cool with damp cloths or ice packs applied to the groin, armpits, and neck
- Encourage fluids (cool water or electrolyte solutions) if the person is conscious
- Loosen or remove tight clothing
Medical Treatment
- Intravenous fluids for rehydration
- Active cooling measures (e.g., cooling blankets, chilled intravenous fluids)
- Monitoring and support of organ function in an intensive care unit
- For malignant hyperthermia: immediate administration of dantrolene as a specific antidote and discontinuation of the triggering anesthetic agent
Prevention
Hyperthermia can be prevented in many cases:
- Drink adequate fluids, especially in hot weather and during physical activity
- Avoid direct sun exposure, particularly during midday hours
- Wear light, loose, and breathable clothing
- Schedule physical activity during cooler morning or evening hours
- Never leave children or animals unattended in parked vehicles
- Take extra precautions with at-risk groups (elderly individuals, infants, people with heart conditions)
References
- World Health Organization (WHO): Heat and Health. WHO Fact Sheet, Geneva, 2018.
- Bouchama A, Knochel JP. Heat Stroke. New England Journal of Medicine, 346(25):1978-1988, 2002.
- Leon LR, Bouchama A. Heat Stroke. Comprehensive Physiology, 5(2):611-647, 2015.
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