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Heat Stroke: Symptoms, Causes and Treatment

Heat stroke is a life-threatening emergency in which the body temperature rises above 40 °C. Immediate cooling and medical attention are essential to prevent serious complications.

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Things worth knowing about "Heat Stroke"

Heat stroke is a life-threatening emergency in which the body temperature rises above 40 °C. Immediate cooling and medical attention are essential to prevent serious complications.

What is Heat Stroke?

Heat stroke is a severe, life-threatening condition in which the body's core temperature rises above 40 °C (104 °F) and the thermoregulatory system fails. Unlike milder heat-related illnesses such as heat exhaustion or heat cramps, heat stroke is a medical emergency that can lead to organ failure, loss of consciousness, and death if not treated promptly.

There are two main types: classic heat stroke, which typically affects elderly individuals, infants, or people with chronic illnesses during prolonged heat exposure, and exertional heat stroke, which occurs during intense physical activity in hot environments and is more common in athletes and outdoor workers.

Causes

Heat stroke occurs when the body generates or absorbs more heat than it can release. Common contributing factors include:

High ambient temperatures, especially combined with high humidity
Intense physical exertion in hot weather
Insufficient fluid intake leading to dehydration
Wearing tight or poorly ventilated clothing or being in an overheated environment
Advanced age, infancy, or early childhood
Underlying conditions such as cardiovascular disease or diabetes
Use of certain medications (e.g., diuretics, anticholinergics, beta-blockers)
Alcohol or drug use

Symptoms

Symptoms of heat stroke can develop rapidly. Common signs include:

Very high body temperature (above 40 °C / 104 °F)
Hot, dry or sometimes moist skin
Rapid, strong pulse (tachycardia)
Severe headache
Confusion, disorientation, or altered mental status
Nausea and vomiting
Dizziness and fainting
Seizures
Loss of consciousness in severe cases

A key distinguishing feature of heat stroke compared to heat exhaustion is the presence of neurological impairment, such as confusion or seizures.

Diagnosis

Heat stroke is typically diagnosed clinically, based on symptoms and patient history. In a hospital setting, the following assessments are performed:

Measurement of core body temperature (rectal or via urinary catheter)
Blood tests: complete blood count, electrolytes, kidney and liver function, coagulation parameters
ECG to assess cardiac function
Imaging (e.g., CT scan of the brain) when neurological symptoms are present
Urine analysis to rule out rhabdomyolysis (muscle breakdown)

Treatment

Heat stroke is a medical emergency. The most critical step is immediate cooling of the affected person while emergency services (911 or local equivalent) are called.

First Aid Measures

Move the person to a shaded or cool area immediately
Remove tight or excess clothing
Cool the person with wet cloths, ice water, or fanning
Apply ice packs to the neck, armpits, and groin
If conscious, allow the person to drink water slowly
If unconscious, place in the recovery position and keep the airway clear

Medical Treatment in Hospital

Active cooling to a target temperature of approximately 38–39 °C
Intravenous fluid replacement for rehydration
Monitoring and support of organ functions (kidneys, liver, heart)
Management of complications such as coagulation disorders (DIC), kidney failure, or seizures
Intensive care for severe cases

Prognosis and Prevention

With rapid treatment, the prognosis can be significantly improved. However, severe heat stroke may result in lasting damage to the brain, kidneys, or other organs. The mortality rate without treatment can reach up to 80%, but with prompt cooling and intensive care it can be reduced to below 10%.

To help prevent heat stroke:

Stay well hydrated (at least 1.5–2 liters per day, more in hot weather)
Avoid direct sun exposure, especially during midday hours
Reduce physical activity in high heat or schedule it during cooler times of the day
Wear light, loose, and breathable clothing
Pay special attention to at-risk groups such as the elderly, young children, and people with chronic illnesses

References

World Health Organization (WHO): Heat and Health – Fact Sheet. Geneva, 2023.
Becker J. A., Stewart L. K.: Heat-Related Illness. American Family Physician, 2011; 83(11):1325–1330.
Centers for Disease Control and Prevention (CDC): Extreme Heat – Warning Signs and Symptoms of Heat-Related Illness. Atlanta, 2023.

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