Heatwave Alert: Doctor Lists 7 Heat Exhaustion Warning Signs You Must Not Ignore

As temperatures surge across parts of the country, doctors are urging people not to brush aside early signs of heat stress.

Prolonged exposure to extreme heat can overwhelm the body’s cooling system, leading to dehydration, heat exhaustion, and in severe cases, heatstroke. Spotting symptoms early — and acting fast — can make the difference between quick recovery and a medical emergency.

According to Dr Pankaj Soni, Principal Director, Internal Medicine at Max Smart Super Speciality Hospital, heat exhaustion is essentially the body’s last warning signal before things turn dangerous.

“When the body can no longer regulate its internal temperature effectively, it begins to show clear physiological distress,” he explains.

7 warning signs you should never ignore

1. Persistent thirst
Thirst is the body’s first alarm. By the time you feel it, dehydration has already begun, as fluid loss through sweat increases salt concentration in the blood.

2. Excessive sweating
Sweating helps cool the body, but during heat exhaustion, this mechanism goes into overdrive.
Red flag: If sweating suddenly stops and the skin turns hot and dry, it could signal progression to heatstroke.

3. Unusual fatigue or weakness
Reduced fluid levels mean less blood circulation to muscles and skin, making the heart work harder. The result: exhaustion, heavy limbs, and low energy.

4. Nausea or vomiting
As the body prioritises cooling and vital organs, blood flow to the digestive system drops, often triggering nausea.

5. Dizziness or lightheadedness
Dilated blood vessels and low fluid levels can reduce blood flow to the brain, causing giddiness — especially when standing up quickly.

6. Muscle cramps
Also called heat cramps, these occur due to loss of electrolytes like sodium and potassium through sweat, disrupting normal muscle function.

7. Rapid heartbeat and breathing
The body enters a stress response:

Faster heart rate to maintain blood pressure
Quicker breathing to regulate temperature and oxygen demand
What to do immediately

If you notice these symptoms, act without delay:

Move to a shaded or air-conditioned space
Drink water or electrolyte-rich fluids
Cool the body with damp cloths or mist
Loosen tight clothing for better airflow
The golden rule

If symptoms persist beyond 30 minutes, or if confusion, disorientation, or unconsciousness sets in, seek emergency medical help immediately.

Heat exhaustion is not just discomfort — it’s a warning. Ignoring it can push the body into a far more dangerous state.