Heat stroke
Heat stroke is the most serious heat-related illness, occurring when the body temperature rises above 104°F (40°C). It is a life-threatening emergency that requires immediate medical attention to prevent permanent organ damage or death.
Overview
Heat stroke is the most serious heat-related illness, occurring when the body temperature rises above 104°F (40°C). It is a life-threatening emergency that requires immediate medical attention to prevent permanent organ damage or death.
Symptoms
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Causes
- •Prolonged exposure to high temperatures
- •Strenuous physical activity in hot weather
- •Dehydration and fluid loss
- •Wearing excessive clothing in the heat
Risk factors
- •Very young children and adults over 65
- •High humidity environments
- •Certain medications (diuretics, beta-blockers)
- •Chronic health conditions like heart or lung disease
How it progresses
3 stages- OnsetSudden, severe symptoms — minutes matter.
- Critical windowTime-sensitive treatment dramatically changes outcome.
- RecoveryLong-term recovery and rehabilitation.
How it's diagnosed
- •Physical examination and core temperature reading
- •Blood tests to check electrolytes and organ function
- •Urinalysis to check for dehydration and kidney damage
- •Imaging (CT or MRI) to rule out other causes of confusion
Treatment options
General educational information only — no dosage advice. Always follow guidance from a qualified clinician.
- •Evaporative cooling techniques using mist and fans
- •Medications to control shivering during cooling
- •This is a medical emergency
- •call 911 immediately
- •Move the person to a cool, shaded area while waiting
- •Apply cool water or wet cloths to the skin
- •Fan the person vigorously to increase airflow
- •Rapid cooling in an ice water bath
- •Intravenous (IV) fluids for rehydration
Complications
- •Long-term damage if untreated
- •Reduced quality of life
- •Worsening symptoms over time
- •Recurrence of heat stroke
Prevention
- •Maintain a healthy lifestyle
- •See a clinician for routine check-ups
When to seek help
- •Symptoms persist beyond a few days
- •Symptoms interfere with daily activities
- •New or worsening symptoms appear
- •Concerning changes related to heat stroke
- Core body temperature of 104°F (40°C) or higher
- Confusion, seizures, or loss of consciousness
- Rapid, strong pulse and rapid breathing
- Hot, dry skin or heavy sweating during exertion
In any emergency, call your local emergency number or go to the nearest emergency department.
Real-world questions
- ›Can Heat stroke cause headaches?
- ›Is Heat stroke reversible?
- ›How quickly does Heat stroke progress?
- ›Is Heat stroke hereditary?
- ›Can Heat stroke be prevented?
Explore related symptoms
Frequently asked questions
Possible causes of Heat stroke include Prolonged exposure to high temperatures, Strenuous physical activity in hot weather, Dehydration and fluid loss, Wearing excessive clothing in the heat.
Heat stroke can be serious and may require prompt medical attention, especially if symptoms are severe or worsening.
Duration varies between individuals. Many cases improve with appropriate care, while others may persist longer and require ongoing management.
Heat stroke typically benefits from medical evaluation and should not be ignored.
Consider seeing a clinician if symptoms are severe, persistent, worsening, or if you have any concerns related to general.
Sources
Information based on general medical references such as:
Last reviewed: May 2026