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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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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