Cold, dry air can trigger asthma symptoms in people with sensitive airways. The term cold-induced asthma is commonly used for asthma that becomes worse in cold conditions, but it is not a separate disease. Cold air is one of several recognized asthma triggers.
Symptoms
Symptoms may begin soon after going outdoors in cold weather or during exercise in cold air. They can include:
- wheezing
- coughing
- shortness of breath
- chest tightness
- difficulty keeping up with usual physical activity
Asthma symptoms can also be triggered by respiratory infections, exercise, smoke, air pollution, allergens and other irritants. A healthcare professional can help determine whether cold air is the main trigger.
Why cold air can trigger symptoms
Cold air is often dry. Breathing cold, dry air can cool and dry the airways, which may cause them to narrow in people with asthma. Exercise can make this more noticeable because faster breathing brings larger amounts of cool, dry air into the airways.
Reducing symptoms in cold weather
- Take prescribed asthma medicines consistently.
- Follow your written asthma action plan.
- Keep your prescribed reliever medicine available when you go outdoors.
- Cover your nose and mouth with a scarf or suitable face covering when the air is very cold. This can help warm the air before you breathe it in.
- Warm up gradually before exercising.
- Avoid tobacco smoke, vaping and other known asthma triggers.
- Pay attention to air quality and reduce strenuous outdoor activity when pollution or smoke levels are high.
Asthma should generally not prevent physical activity when it is well controlled. If exercise or cold weather regularly causes symptoms, discuss the treatment plan with a healthcare professional rather than simply avoiding activity.
Diagnosis and asthma review
If symptoms occur repeatedly, diagnosis may involve a review of the symptom pattern and lung function testing such as spirometry or peak expiratory flow measurements. In some situations, exercise or another airway challenge test may be used to investigate whether the airways narrow in response to a trigger.
Arrange an asthma review if cold weather repeatedly limits normal activities, symptoms wake you at night, symptoms are becoming more frequent or your usual treatment is no longer controlling them. Inhaler technique, treatment and other possible triggers may need to be reviewed.
Treatment
Treatment follows the overall asthma management plan. Asthma medicines may include anti-inflammatory controller treatment and reliever medicines. The exact combination depends on age, symptoms, asthma severity and the treatment plan recommended by the healthcare professional.
Some people with exercise-related symptoms may be advised to use a prescribed reliever medicine before physical activity. Follow the individual instructions in your asthma action plan and do not change regular asthma medicines without medical advice.
When to seek urgent help
Follow your asthma action plan if symptoms suddenly worsen. Seek emergency medical care if breathing becomes severely difficult, you cannot speak normally because of breathlessness, the lips or skin become blue or gray, you become confused or exhausted, you collapse, or prescribed emergency treatment is not helping. Use your local emergency medical service for severe or life-threatening symptoms.
Related topics
Sources
- National Heart, Lung, and Blood Institute: Asthma Causes and Triggers
- NHLBI: Asthma Treatment and Action Plan
- CDC: Controlling Asthma
Last reviewed: 4 September 2026. This page provides general health information and does not replace individual medical advice.