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WHAT IS HEATSTROKE

 


What Is Heatstroke?

Heatstroke is a life-threatening medical emergency that occurs when the body’s core temperature rises above 40°C (104°F) and the body can no longer cool itself effectively. This condition can rapidly cause damage to the brain and vital organs, and can be fatal if not treated promptly.

Causes

Heatstroke can develop in two main ways:

  • Classic (non-exertional) heatstroke: This occurs after exposure to high environmental temperatures, especially in hot, humid weather. It often affects older adults, young children, or people with chronic health conditions, particularly when they are in poorly ventilated or uncooled environments.

  • Exertional heatstroke: This is triggered by intense physical activity in hot conditions, commonly affecting athletes, outdoor workers, or military personnel. Heavy clothing, dehydration, and lack of acclimatization to heat increase the risk.

Other contributing factors include wearing heavy clothing, drinking alcohol, certain medications, and dehydration.

Symptoms

The hallmark of heatstroke is a core body temperature above 40°C (104°F). Other symptoms include:

  • Confusion, agitation, delirium, or strange behavior

  • Dizziness, fainting, or loss of consciousness

  • Throbbing headache

  • Nausea and vomiting

  • Rapid heartbeat and shallow breathing

  • Red, hot, and dry skin (though sweating may still occur in exertional heatstroke)

  • Seizures or muscle cramps

  • Slurred speech and poor coordination

Why Is Heatstroke Dangerous?

Heatstroke can quickly lead to serious complications such as:

  • Brain damage

  • Multi-organ failure (including kidney and heart failure)

  • Seizures

  • Rhabdomyolysis (muscle breakdown)

  • Death, if not treated urgently

Who Is at Risk?

Anyone can develop heatstroke, but risk is higher in:

  • Very young children and older adults

  • People with chronic illnesses or on certain medications

  • Athletes and outdoor workers

  • Individuals exposed suddenly to hot weather or heatwaves

  • Those wearing heavy or non-breathable clothing

Immediate Actions and Treatment

Heatstroke requires immediate medical attention. First aid steps include:

  • Moving the person to a cooler environment

  • Removing excess clothing

  • Cooling the body with water (cool bath, shower, wet towels, or ice packs on armpits, groin, neck, and head)

  • Fanning or misting with cool water

  • Calling emergency services immediately

Summary Table: Heatstroke vs. Heat Exhaustion

Feature

Heat Exhaustion

Heatstroke

Core temperature

Normal or slightly raised

Above 40°C (104°F)

Sweating

Profuse

May stop (classic); may persist (exertional)

Mental state

Weakness, dizziness

Confusion, delirium, unconsciousness

Skin

Cool, pale, clammy

Red, hot, dry (or damp)

Risk

Can progress to heatstroke

Life-threatening emergency

Key Takeaway

Heatstroke is the most severe form of heat-related illness, marked by a dangerously high body temperature and neurological symptoms. It is a medical emergency that can cause permanent organ damage or death if not treated immediately.


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SYMPTOMS AND CAUSES OF HEATSTROKE

  Symptoms of Heatstroke Heatstroke is a serious medical emergency characterized by the following key symptoms: High body temperature: A core body temperature of 104°F (40°C) or higher is the main indicator of heatstroke. Altered mental state or behavior: This can include confusion, agitation, slurred speech, irritability, delirium, seizures, aggression, or even coma. Change in sweating pattern: In classic (nonexertional) heatstroke, the skin may feel hot and dry. In exertional heatstroke (from intense activity), the skin may be moist from heavy sweating. Flushed or red skin: The skin may appear red as body temperature increases. Nausea and vomiting: Feeling sick to the stomach or vomiting is common. Rapid breathing: Breathing may become fast and shallow. Racing heart rate: The pulse may significantly increase as the heart works harder to cool the body. Headache: Often described as throbbing. Muscle weakness or cramps . Dizziness, fainting, or lightheadedness . Loss of cons...