Sudden Temperature Fluctuations In Winter Can Trigger Respiratory Infections, Expert Explains How

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As winter sets in across Indian cities, most people think only of 'cold weather' as the culprit behind cough, cold, and sore throat. In reality, what troubles your lungs even more is not just low temperature - it's the sudden fluctuation between warm and cold air. The impact rises even more due to the polluted air quality.

We spoke to Dr Anjali R Nath, Consultant Pulmonologist & Allergy Specialist, Hosmat Hospitals, Magrath Road, Bengaluru, who explained the link between respiratory infections and temperature fluctuations in winter.

Why Does See-Saw Weather Strain Your Lungs?

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"Our airways are lined with a delicate defence system, tiny hair-like structures and immune cells that trap and clear viruses, bacteria and pollutants. Sudden exposure to cold, dry air can temporarily blunt this defence," said Dr Nath.

Studies have shown that cold temperatures and low humidity are associated with increased respiratory tract infections because they impair the local immune response in the nose and airway. "An Indian hospital-based explainer also notes that cold air reduces the ability of nasal cells to fight viral invaders, making the common cold and flu more frequent in winter," added Dr Nath.

When you move rapidly:

• from a warm room to a cold balcony
• from a heated car into foggy, polluted air
• or sleep in a warm bed and wake to a sudden temperature drop

...the respiratory tract has to repeatedly adapt. This stress, combined with viruses already circulating in the community, increases infection risk.

Indian Data: Temperature Swings, Pollution and Rising Cases

Recent reports from Indian cities like Mangaluru, Bhopal and Lucknow describe a 20-30% rise in respiratory infections during early winter and festival season, with doctors linking this spike to sudden weather changes, air pollution and smoke exposure. Children, the elderly and people with asthma or COPD are the worst affected.

Globally, research consistently shows that emergency visits and hospitalisations for respiratory disease climb as ambient temperature drops, especially in older adults and those with chronic lung conditions.

Who is Most Vulnerable?

From our clinical experience at HOSMAT, we see higher winter risk in:

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• Children under 5 years
• Adults over 60 years
• People with asthma, bronchitis or COPD
• Those with diabetes, heart disease or weakened immunity
• Individuals exposed to dust, smoke, biomass fuel or traffic pollution

For these groups, even a 'simple' viral infection can progress to bronchitis or pneumonia if ignored.

Typical Infections We See In Winter

Sudden temperature fluctuations, combined with crowding and poor ventilation, create the perfect environment for:

• Common cold and flu (upper respiratory infections)
• Acute bronchitis - persistent cough, chest congestion
• Sinusitis - headache, facial pain, thick nasal discharge
• Viral-triggered asthma exacerbations
• Bacterial infections like pneumonia, as a complication

Some studies suggest that a significant proportion of asthma flare-ups - often 50-60% - are associated with underlying viral respiratory infections.

Practical Ways to Protect Yourself

You cannot control the weather, but you can reduce its impact on your lungs. Here are some expert-recommended measures that you should follow:

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• Layer your clothing so your body can adapt gradually to temperature changes.
• Avoid stepping out on terraces or balconies in thin clothes immediately after a hot shower or exercise.
• Use a scarf or mask to cover your nose and mouth in early mornings and late evenings. This warms and humidifies inhaled air.
• Keep indoor air clean: avoid incense, mosquito coils and smoking indoors.
• Stay hydrated; dry mucosa is more prone to irritation and infection.
• Take your annual flu vaccine, especially if you are elderly or have chronic lung disease.

Message From The Expert

Dr Nath said, "From an orthopaedic and multi-speciality hospital perspective, we see how winter respiratory infections impact overall health - delayed surgeries, prolonged hospital stays and increased complications in patients with heart or joint disease."

"Our message is simple: don't ignore the early signs. A persistent cough, wheeze, breathlessness or fever in winter, especially after sudden exposure to cold air, deserves timely evaluation. With sensible precautions and prompt treatment, most winter respiratory infections can be controlled before they become serious," she concluded.

Disclaimer: The information provided in this article is for general informational and educational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or a qualified healthcare provider with any questions you may have regarding a medical condition.