Heatstroke vs dehydration: What your body is trying to tell you

As temperatures soar across India, cases of summer-related illnesses are rising rapidly. Two of the most common—and often confused conditions are heatstroke and dehydration. While both are caused by excessive heat, they are not the same. Understanding the difference can help you act quickly and prevent serious health risks.

WHAT IS DEHYDRATION?

Dehydration occurs when your body loses more fluids than it takes in. In extreme summer heat, excessive sweating, not drinking enough water, or prolonged outdoor exposure can quickly lead to fluid loss.

Common symptoms include

• Dry mouth and lips

• Fatigue or weakness

• Dizziness or light-headedness

• Dark yellow urine or reduced urination

• Headaches

Dehydration is usually mild to moderate and can often be treated by increasing fluid intake. However, if ignored, it can worsen and lead to more serious complications.

WHAT IS HEATSTROKE?

Heatstroke is a severe and potentially life-threatening condition that occurs when the body’s temperature rises above 40°C and can no longer regulate itself. It is considered a medical emergency.

Warning signs include

• High body temperature (above 40°C)

• Hot, dry skin (sometimes with no sweating)

• Confusion or disorientation

• Rapid heartbeat

• Nausea or vomiting

• Loss of consciousness

• Unlike dehydration, heatstroke requires immediate medical attention.

KEY DIFFERENCES YOU MUST KNOW

• Severity: Dehydration is usually less severe; heatstroke is critical

• Body temperature: Normal or slightly elevated in dehydration; dangerously high in heatstroke

• Sweating: Common in dehydration; may stop in heatstroke

• Mental state: Normal in dehydration; confusion or unconsciousness in heatstroke

WHEN TO SEEK HELP

If someone shows signs of heatstroke especially confusion, fainting, or very high body temperature, seek emergency medical help immediately. Do not delay treatment.

For dehydration, if symptoms persist despite drinking fluids, or if there is vomiting and inability to retain water, consult a doctor.

HOW TO STAY SAFE IN EXTREME HEAT

• Drink water regularly, even if you don’t feel thirsty

• Avoid stepping out during peak afternoon hours

• Wear light, breathable clothing

• Include water-rich foods like fruits and vegetables in your diet

• Limit caffeine and alcohol intake

While dehydration and heatstroke may seem similar, the difference between them can be life-saving. Staying aware, hydrated, and cautious during extreme heat is the best way to protect yourself and your loved ones this summer.