Medically reviewed by Barbara Chatr-Aryamontri, MD
For people with asthma, the first cold snap of the season can feel like a warning sign. A short walk outside suddenly triggers coughing and breathing feels tighter. Symptoms that were manageable all summer start flaring up again.
Cold air is one of the most common asthma triggers, and understanding why it affects the lungs can help you stay ahead of it as temperatures drop.
Why cold air affects asthma
Airways are used to warm, moist air. When you breathe in cold, dry air, it can irritate the lining of the airways and cause them to narrow. This makes it harder to breathe and can trigger coughing, wheezing or shortness of breath.
Cold air also tends to be drier, which pulls moisture from the airways. For people with asthma, whose airways are already sensitive, that dryness can be enough to set off symptoms.
Winter brings other triggers too. People spend more time indoors, which means more exposure to dust, pet dander and other indoor allergens. Colds and flu are also more common in colder months, and respiratory infections can worsen asthma symptoms.
Signs your asthma is reacting to cold weather
● Coughing that starts shortly after going outside
● Wheezing or a whistling sound when breathing
● Chest tightness
● Shortness of breath during activities that were fine before
● Needing to use a rescue inhaler more often
If any of these symptoms are new or getting worse, it’s worth checking in with a doctor before winter fully sets in.
How to manage symptoms as it gets colder
● Cover your mouth and nose: A scarf or mask helps warm and humidify the air before it reaches your lungs.
● Warm up before exercising outside: A slow, gradual start gives airways time to adjust.
● Breathe through your nose, not your mouth, when possible: The nose naturally warms and moistens air better than the mouth does.
● Keep your rescue inhaler with you: Cold weather is not the time to leave it at home.
● Watch the air quality and wind chill: On especially cold or windy days, consider moving workouts indoors.
● Stay on top of your asthma action plan: If your doctor has given you one, cold weather is a good time to review it and make sure your medications are current.
● Get a flu shot: Respiratory infections can worsen asthma symptoms, and prevention goes a long way.
When to call your doctor
Most cold-weather asthma symptoms can be managed with a few precautions. But if you’re using your rescue inhaler more than usual, waking up at night with symptoms or noticing that your usual routine isn’t working anymore, it’s time to check in with a doctor. Asthma that seems to be getting worse, especially with the seasons changing, may mean your treatment plan needs an update.
Cold air doesn’t have to mean months of managing flare-ups. With a few adjustments and the right plan in place, most people with asthma can stay active and breathe easier all winter long.
If your asthma symptoms are getting worse as the weather changes, talk to your doctor about updating your treatment plan. Visit our website to learn more about WMCHealth’s approach to pulmonology and respiratory care and to find a provider near you.