A Doctor Explains the Difference Between Heat Exhaustion & Heat Stroke

Every summer, I see patients saying the same thing, “Doctor, I thought it was just weakness from the heat.”

But sometimes, what starts as simple heat exhaustion can quickly turn into heat stroke, a medical emergency that can become life-threatening if ignored.

Many people use both terms interchangeably, but medically, they are very different conditions.

Knowing the difference can help you act early and avoid serious complications.

Heat exhaustion happens when:

• Your body loses excessive water and salts
• Dehydration starts affecting normal body function
• The body is struggling to cool itself

It is serious, but usually reversible if treated early.

• Heavy sweating
• Extreme thirst
• Weakness
• Dizziness
• Headache
• Nausea
• Muscle cramps
• Fatigue

Heat stroke is the most severe form of heat-related illness.

This happens when:

• The body temperature rises dangerously high
• The cooling system fails completely
• Vital organs start getting affected

This is a medical emergency.

Without immediate treatment, heat stroke can affect:

• • • Brain
    • Heart
    • Kidneys
    • Muscles

• Very high body temperature
• Confusion or disorientation
• Hot, dry skin
• Rapid heartbeat
• Difficulty breathing
• Slurred speech
• Seizures
• Loss of consciousness

From what I commonly see in practice, risk is higher in:

• • Elderly individuals
  • Children
  • Outdoor workers
  • Athletes
  • Diabetic patients
  • Heart patients
  • People who stay dehydrated

If someone has heat exhaustion:

• Move them to a cool place
• Give fluids and electrolytes
• Let the body cool down
• Avoid further heat exposure

If you suspect heat stroke:

• • Seek emergency medical care immediately
  • Apply cold cloths or ice packs
  • Do not delay treatment

Heat exhaustion is a warning sign.

Heat stroke is an emergency.

Recognising the difference early can prevent severe complications and save lives.

If you or your loved one experiences symptoms related to extreme heat exposure, consult our Emergency Medicine or Internal Medicine Department immediately for timely evaluation and treatment.

Heat exhaustion is a warning sign, but heat stroke is a medical emergency. Recognising heat stroke symptoms early and seeking timely treatment can prevent serious complications. If you or your loved one experiences symptoms related to extreme heat exposure, visit our Emergency Medicine or Internal Medicine Department for expert evaluation and immediate care.