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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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Things worth knowing about "Hyperthermia"

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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