With temperatures soaring across many regions of India, doctors are raising concerns over the growing health dangers linked to intense heatwaves. Once the mercury nears 46°C, the body can come under severe stress, increasing the chances of dehydration, heat exhaustion, heatstroke, and even critical organ damage.
Medical experts say continuous exposure to such extreme heat can disrupt the body’s natural cooling process, particularly among children, senior citizens, outdoor workers, and individuals already dealing with chronic health conditions.
What happens to the body in 46°C heat?
Under normal conditions, the human body maintains a temperature close to 37°C by releasing heat through sweat and improved blood flow near the skin. But during extreme heat, especially when humidity levels are high, the body struggles to cool itself efficiently.
As overheating begins, several symptoms may appear, such as:
- Profuse sweating
- Weakness and dizziness
- Persistent headaches
- Muscle cramps
- Increased heart rate
- Nausea and vomiting
- Intense thirst
- Tiredness and mental confusion
Understanding heat exhaustion and heatstroke
Heat exhaustion usually develops after excessive sweating causes major loss of fluids and salts from the body. A person may experience fainting, weakness, clammy skin, and heavy perspiration.
If the condition worsens, it can lead to heatstroke — a medical emergency that occurs when body temperature rises beyond 40°C and the body loses control over its temperature regulation system.
Key warning signs of heatstroke include:
- Disorientation or unusual confusion
- Extremely hot and dry skin
- Little or no sweating
- Difficulty speaking clearly
- Seizures
- Unconsciousness
Doctors warn that delayed treatment in such cases can severely affect the brain, heart, kidneys, and muscles.
Why extreme heat can damage organs
During a heatwave, the heart works harder to circulate blood toward the skin to release body heat. This places additional pressure on the cardiovascular system, making conditions like hypertension and heart disease more dangerous.
At the same time, severe dehydration can lower blood circulation to vital organs, increasing the risk of:
- Kidney-related complications
- Electrolyte imbalance
- Sudden drop in blood pressure
- Muscle tissue breakdown
- Respiratory distress
Several international studies have linked prolonged heatwaves with rising hospital admissions and heat-related fatalities.
Who faces the highest risk?
Health experts say certain sections of the population are more vulnerable during severe heat conditions, including:
- Elderly people
- Infants and young children
- Pregnant women
- Patients with diabetes or heart ailments
- Labourers and athletes working outdoors
- People without access to proper cooling or drinking water
Urban regions often experience even higher temperatures due to the “urban heat island” effect, where roads, buildings, and concrete structures trap heat for longer periods.
Safety measures during a heatwave
Doctors advise people to remain cautious during extreme weather conditions and follow preventive steps to avoid heat-related illnesses.
Drink enough fluids:
Consume water frequently throughout the day. ORS, coconut water, and electrolyte-based drinks can also help maintain hydration.
Avoid outdoor exposure during peak hours:
Limit direct sunlight exposure between noon and late afternoon when temperatures remain highest.
Choose loose and breathable clothes:
Light-coloured cotton clothing helps the body release heat more effectively.
Eat simple and lighter meals:
Heavy foods may increase body discomfort and raise internal heat levels.
Act quickly if symptoms appear:
Immediate medical attention is necessary if someone shows signs like confusion, unconsciousness, or stopped sweating.
Experts stress that a 46°C heatwave should never be taken lightly. Extreme temperatures can affect the body rapidly and become life-threatening if precautions are ignored. Staying hydrated, avoiding direct heat exposure, and recognizing early warning signs can play a crucial role in preventing serious health emergencies.