Dr Pooja T, Senior Specialist Pulmonologist, Aster RV Hospital

Winter is usually uncomfortable for everyone, but for people with respiratory diseases, persistent
cold can feel like the body is being pushed into a corner. The cold season doesn’t just make the air
chilly; it changes how your lungs behave internally. Many people assume that breathing difficulty
comes only from infections, but the truth is that winter itself alters the lung environment. For
someone with asthma, bronchitis, COPD, sinusitis or chronic allergic problems, even a normal winter
day can trigger symptoms. Understanding these hidden changes helps you protect your lungs better.
The Real Reason Cold Air Harms the Lungs

One of the biggest but least discussed changes is what happens to the tiny hair-like structures inside
your airways called cilia. These cilia work like a cleaning crew, sweeping out dust, smoke and viruses.
In cold weather, these cilia almost go into slow motion, losing nearly half their usual speed. That
means the lungs cannot remove irritants efficiently. Even if the air is clean, the lungs feel congested
because whatever goes in stays trapped longer. This is why winter mornings feel heavier for people
with respiratory issues. The mucus also becomes thicker and stickier, making it harder to cough out.

Another surprising change winter brings is a rise in natural body chemicals like histamine. Most
people think histamine increases only during allergies, but cold weather also pushes its level up.
Histamine inflames and tightens the airways, which is why the chest sometimes feels heavy even
without any infection. The throat may feel tight or scratchy, and even a small amount of cold air can
cause discomfort. This is not an illness; it is the body reacting to temperature. Warm water, ginger,
tulsi and turmeric help calm this kind of inflammation naturally by reducing the histamine response.

Respiratory patients also need to understand that protecting their body from cold is not only about
wearing thick sweaters. What matters most is warming the air before it reaches the lungs. When you
breathe cold air directly especially through your mouth the lungs experience a sudden
temperature drop and react by tightening.

Covering the nose and mouth with a scarf works better than any jacket because it warms and
moistens the air before you inhale it. Even a simple cotton mask inside and a surgical mask outside
act like a mini heater for your airways. Breathing through the nose is especially important in winter
because the nose naturally warms and filters the air. Mouth breathing sends cold air straight to the
chest, which is more likely to trigger wheezing or coughing.

A unique winter challenge for respiratory patients is something known as cold shock. This happens
when you step out of a warm room directly into cold air. The sudden temperature change makes the
airway muscles contract. Within seconds you may feel breathless, dizzy or unable to inhale fully. To
avoid this, it helps to pause at the doorway or balcony for a minute before stepping out.

Indoor air is another hidden winter enemy. Since most windows stay shut, dust, cooking smoke,
room fresheners and even invisible fungal particles remain trapped inside. When combined with
slow moving cilia, this becomes a dangerous mix. In winter, even clean looking rooms can irritate
the lungs. Keeping one small window slightly open, letting sunlight hit the bed, airing out pillows
occasionally and reducing incense or coils can make a huge difference.
Hydration plays a much bigger role in winter respiratory health than most people think. People often
drink less water in cold weather because they don’t feel thirsty, but the airways dry up quickly.

Rather than drinking a big glass once in a while, sipping warm water frequently is more effective. The

airway lining absorbs moisture slowly, so frequent tiny sips help keep the throat moist and prevent
thick mucus. Warm fluids like herbal teas, light soups, warm rasam or jeera water work like natural
medicine because they reduce internal dryness.
Finally, respiratory patients should never ignore early warning signs in winter. A slight increase in
nighttime cough, chest tightness while lying down, difficulty breathing after climbing stairs or a
feeling that the chest is filling up are all signals that the cold is stressing the lungs. Winter flare-ups
grow fast, so early attention prevents bigger complications.