Asthma is a chronic medical condition that causes airway inflammation and narrowing, leading to shortness of breath, wheezing, and chest tightness. While medications are essential for managing symptoms, breathing techniques can also help improve airflow and reduce breathlessness. 

One simple yet effective method is pursed-lip breathing, which slows exhalation, reduces airway resistance, and helps prevent air trapping. This technique is particularly useful during asthma flare-ups, after physical activity, or when experiencing anxiety-related breathlessness.

This article will explain how asthma affects breathing, how pursed-lip breathing works, and the physiological benefits it offers. We will also discuss when to use pursed-lipped breathing and how to practice it correctly. By the end, you’ll have a deeper understanding of how this technique can support better breathing and improve asthma symptoms.

Understanding asthma and its impact on breathing

Understanding how asthma impacts the respiratory system is essential to recognising the benefits of pursed-lip breathing.

Asthma is a major non-communicable disease (NCD), affecting both children and adults. According to the World Health Organisation, an estimated 262 million people were affected by asthma in 2019. This condition is caused by muscle tightening and inflammation around the airways, making it difficult for air to flow freely in and out of the lungs.^1,2,3

The symptoms of asthma, such as chest tightness, wheezing, coughing, and shortness of breath, can change in severity over time. When asthma symptoms flare up, many individuals tend to breathe faster and more shallowly. This type of breathing can worsen symptoms, as it does not allow enough time for the lungs to fully empty, leading to increased carbon dioxide retention and further shortness of breath.^1–4

What is pursed-lip breathing?

Pursed-lip breathing is a controlled breathing technique designed to slow down exhalation and create slight resistance in the airways, preventing them from collapsing too quickly. This technique is simple to perform and can be used anytime, anywhere, without requiring any special equipment.^5,6

Pursed-lip breathing is a technique that begins by relaxing the neck and shoulder muscles. The process starts with a deep inhalation through the nose for about two seconds. The lips are then pursed as though preparing to whistle or blow out a candle. Exhalation is slow and controlled, lasting at least four seconds. This ensures that the exhalation is longer than the inhalation, which prevents air trapping. 

This breathing pattern should be repeated for several minutes until the breathing becomes more controlled and relaxed. Pursed-lip breathing is particularly beneficial during episodes of shortness of breath, such as those caused by asthma, as it helps restore control over breathing.^5–7

How pursed-lip breathing helps with asthma

Pursed-lip breathing offers several benefits for managing asthma. It helps improve airflow, reduce breathing difficulties, and alleviate discomfort during an asthma episode. Below are some of the key ways in which this technique can support better respiratory function and ease asthma symptoms.

1. Reducing airway resistance

One of the key challenges in asthma is airway resistance, which makes breathing difficult. When airways become inflamed and narrowed, they create turbulence in airflow, requiring more effort to breathe. 

Pursed-lip breathing helps by creating positive expiratory pressure, which keeps the airways open longer and reduces the resistance faced during exhalation. This allows for a more gradual and controlled release of air, preventing the sensation of air being trapped in the lungs.^5,6

2. Improving oxygen and carbon dioxide exchange

Shallow, rapid breathing often leads to an imbalance in oxygen and carbon dioxide levels in the blood. This can cause dizziness, tingling sensations, and increased feelings of breathlessness.

By slowing the breath and extending the exhalation, pursed-lip breathing improves the balance of gases in the lungs. It ensures that stale air is expelled, making room for fresh oxygen during the next inhalation.^6,8

3. Preventing air trapping

Air trapping occurs when the lungs do not fully empty during exhalation, leading to a buildup of old air and a feeling of suffocation. Many people with asthma experience this sensation, especially during exertion or at night. 

Pursed-lip breathing helps by encouraging longer, more efficient exhalation, ensuring that trapped air is expelled before taking the next breath. This can significantly improve breathing comfort and reduce the feeling of tightness in the chest.^5,6,8

4. Promoting Relaxation and Reducing Anxiety

Asthma symptoms can be frightening, and anxiety often makes breathing difficulties worse. When a person feels short of breath, they may panic, leading to faster, shallower breathing that further exacerbates symptoms. 

Pursed-lip breathing helps calm the nervous system by engaging the parasympathetic nervous system, which is responsible for relaxation. By slowing down the breath, this technique signals to the brain that the body is not in danger, helping to reduce feelings of panic and allowing the individual to regain control of their breathing.^5,8

When to use pursed-lip breathing

Pursed-lip breathing can be a valuable tool for individuals with asthma, especially when used at the right moments. It helps regulate breathing, ease discomfort, and support the body's natural ability to maintain open airways. This technique can be applied in various situations where asthma symptoms may appear or intensify:

• During mild to moderate shortness of breath; At the first signs of breathing difficulty, pursed-lip breathing can help slow the breath and prevent symptoms from escalating⁷
• After physical activity: Exercise can sometimes trigger asthma symptoms. Practising this technique during the cool-down phase may help the lungs recover and reduce post-exercise breathlessness.^8–10
• During an asthma flare-up: If chest tightness or wheezing occurs, pursed-lip breathing can ease the feeling of breathlessness while waiting for medications, such as inhalers, to take effect^5,7
• Before sleep, Asthma symptoms can worsen at night. Using this technique before bedtime can help relax the airways, promoting deeper, more restful breathing and improved sleep quality ^5,11

Incorporating pursed-lip breathing into daily routines and learning when to use it effectively can greatly enhance asthma management and improve overall respiratory comfort.

Additional benefits of pursed-lip breathing

In addition to its benefits for asthma, pursed-lip breathing can also be helpful in managing other conditions. It is commonly used by individuals with chronic obstructive pulmonary disease (COPD) to ease breathing and improve oxygen exchange. The technique can also assist in calming anxiety and panic attacks by promoting slower, more controlled breathing. 

During post-surgical recovery, especially after procedures affecting the chest or abdomen, pursed-lip breathing may help prevent lung complications by encouraging deeper, more effective breaths. It can also be beneficial in managing breathlessness experienced in high-altitude environments. With regular practice, this technique can enhance overall lung function and increase tolerance to physical activity.^5,10,12

Summary

Pursed-lip breathing is a simple yet highly effective tool for people with asthma. By reducing airway resistance, preventing air trapping, and improving oxygen exchange, it provides a natural way to ease breathing difficulties. This technique is especially useful during mild asthma flare-ups, after exercise, and in moments of breathlessness.

While it does not replace medication, incorporating pursed-lip breathing into a daily asthma management plan can enhance overall lung function and breathing efficiency. When practised regularly, it can become a powerful, drug-free technique to support easier and more confident breathing. For those who experience frequent shortness of breath due to asthma, trying pursed-lip breathing may offer noticeable relief and improved respiratory control.

Commonly asked questions 

What is pursed-lip breathing, and how does it help with asthma?

Pursed-lip breathing is a technique where you inhale through your nose and exhale slowly through pursed lips. It helps people with asthma by slowing down exhalation, reducing airway collapse, and improving airflow, especially during episodes of shortness of breath.

When should I use pursed-lip breathing if I have asthma?

You can use it during mild flare-ups, after physical activity, or when feeling breathless or anxious. It’s also helpful before sleep to relax your breathing and during recovery after an asthma attack.

Is this technique a replacement for my inhaler or medication?

No, pursed-lip breathing is a helpful addition to your asthma management, but should never replace prescribed medications or inhalers. If you’re unsure whether pursed-lip breathing is suitable for you, especially if you have other health conditions, check with your healthcare provider.⁵

What are the benefits and risks of pursed-lip breathing in asthma?

Pursed-lip breathing can make breathing easier by slowing your breath, helping release trapped air, and reducing shortness of breath. It can also make physical activity more manageable and help calm stress, improving overall quality of life for people with asthma. The risks are minimal, but if you feel dizzy, light-headed, or overly tired while practising, it’s best to stop and rest.⁵