Asthma may seem well controlled, but symptoms can sometimes worsen rapidly and develop into a medical emergency.

An asthma exacerbation, often referred to as an asthma attack, is a period when asthma symptoms become worse than usual. A person may experience increased coughing, wheezing, chest tightness, or difficulty breathing, along with reduced lung function. Symptoms may gradually worsen over several hours or days, or they may develop rapidly.

Even people who rarely experience asthma symptoms or whose asthma has previously been well controlled can develop a severe exacerbation. Recognizing early warning signs and having an appropriate action plan are therefore essential.

What Is an Asthma Exacerbation?

Asthma is a chronic respiratory disease involving inflammation and narrowing of the airways. During an exacerbation, the muscles surrounding the airways tighten, the airway lining becomes more inflamed and swollen, and mucus production may increase. Together, these changes narrow the passages through which air moves in and out of the lungs.

As a result, breathing requires more effort, particularly when breathing out. This can lead to shortness of breath, chest tightness, coughing, and wheezing.

The severity of an exacerbation varies from person to person. Some episodes can be managed according to an asthma treatment plan provided by a healthcare professional, while severe exacerbations may require hospital treatment. In very severe cases, an asthma exacerbation can be life-threatening.

Symptoms to Watch For

Symptoms of an asthma exacerbation can vary, but they generally involve a noticeable increase in the frequency or severity of usual asthma symptoms, including:

• Shortness of breath or difficulty getting enough air
• Wheezing
• Increased coughing, particularly at night or early in the morning
• Chest tightness or discomfort
• Needing reliever medication more often than usual
• Symptoms interfering with sleep, work, or daily activities
• Reduced Peak Expiratory Flow (PEF), if a peak flow meter is being used as part of the asthma management plan

It is important not to wait until severe breathing difficulty develops before taking action. Recognizing changes from your usual asthma symptoms and following your Asthma Action Plan at an early stage can help reduce the risk of the exacerbation becoming more severe.

What Can Trigger an Asthma Exacerbation?

Asthma exacerbations can be triggered by many different factors, and triggers vary from person to person.

Respiratory viral infections are among the common triggers. Infections such as the common cold, influenza, or respiratory syncytial virus (RSV) can increase airway inflammation and worsen asthma symptoms.

Allergens are another important trigger, particularly in people with allergic asthma. These may include dust mites, pollen, mold, animal allergens, and cockroaches.

Cigarette smoke, secondhand smoke, emissions from electronic cigarettes, air pollution, chemicals, and certain strong odors can also irritate the airways and trigger symptoms.

Other possible triggers include exercise, cold or dry air, changes in weather, stress or intense emotions, and certain medications. Beta-blockers, as well as aspirin and other nonsteroidal anti-inflammatory drugs (NSAIDs), can trigger or worsen asthma symptoms in some individuals.

Another important risk factor is inconsistent use of asthma controller medications containing inhaled corticosteroids (ICS) or stopping these medications without medical advice. This can leave airway inflammation inadequately controlled and increase the risk of an exacerbation.

Warning Signs That Should Not Be Ignored

A severe asthma exacerbation is a medical emergency. Urgent medical assessment is needed if symptoms rapidly become more severe or do not improve after using medication according to the treatment plan provided by a healthcare professional.

Particular warning signs include severe difficulty breathing that makes it difficult to speak or perform normal activities, symptoms that do not respond to reliever medication, or symptoms that rapidly worsen again after initial improvement.

Drowsiness, confusion, or a “silent chest,” in which little or no breath sounds can be heard because airflow is severely reduced, are signs of a potentially life-threatening condition and require immediate emergency medical care.

In young children, severe symptoms such as unusual drowsiness, confusion, bluish discoloration of the lips or skin, or other signs of significant respiratory distress also require emergency medical attention.

What Should You Do When Symptoms Begin?

People diagnosed with asthma should have a written Asthma Action Plan developed together with their healthcare professional. This plan explains how to recognize worsening asthma, which medications to use and when to use them, and when to seek medical or emergency care.

When symptoms of an exacerbation begin, reliever medication should be used according to the type, dose, and instructions specified in the individual’s treatment plan. Medication should not be increased, reduced, or changed without advice from a healthcare professional.

If symptoms do not improve after following the treatment plan, or if severe symptoms develop, medical attention should be sought promptly. Severe symptoms should not be managed at home for a prolonged period without appropriate medical assessment.

At a healthcare facility, clinicians may assess the severity of the exacerbation based on symptoms, respiratory rate, heart rate, oxygen saturation, and lung function when appropriate. Treatment may include bronchodilators, corticosteroids, oxygen, and additional therapies depending on the severity of the condition.

How Can Future Exacerbations Be Prevented?

Preventing asthma exacerbations involves more than simply avoiding triggers. An important goal is maintaining long-term control of airway inflammation.

The Global Initiative for Asthma (GINA) recommends asthma treatment that includes an inhaled corticosteroid because ICS-containing treatment reduces the risk of severe asthma exacerbations.

Patients should use their medications consistently according to their treatment plan and should not stop controller medication on their own simply because they are feeling better. Learning and regularly reviewing the correct inhaler technique is also important because incorrect technique may prevent an adequate amount of medication from reaching the airways.

Identifying and reducing exposure to personal asthma triggers can also help. This may include avoiding cigarette smoke and electronic cigarette emissions, reducing exposure to known allergens, and monitoring air quality when air pollution is known to worsen symptoms.

After an asthma exacerbation, follow-up with a healthcare professional is important. This allows the healthcare team to reassess asthma control and risk factors, review inhaler technique and medication adherence, and update the Asthma Action Plan when necessary.

Summary

An asthma exacerbation is more than a temporary episode of worsening asthma symptoms. It is a sign that airway function is deteriorating and, in some cases, can progress to a life-threatening condition—even in people who normally experience asthma symptoms only occasionally.

Understanding what your usual asthma symptoms are like can help you recognize changes early. It is important to follow the treatment plan provided by your healthcare professional, recognize when medical assistance is required, and avoid stopping controller medication on your own when symptoms improve.

Consistent asthma management, correct inhaler technique, reducing exposure to known triggers, and having a clear Asthma Action Plan are important steps in reducing the risk of severe exacerbations and helping people with asthma maintain safer, more active daily lives.

Prepared by: Punyanooch Angkanawin, Pharm.D.

References

1. Global Initiative for Asthma (GINA). Global Strategy for Asthma Management and Prevention / Summary Guide for Asthma Management and Prevention. 2026. https://ginasthma.org/2026-gina-summary-guide/
2. National Heart, Lung, and Blood Institute (NHLBI). Asthma Attack. https://www.nhlbi.nih.gov/health/asthma/attacks
3. Centers for Disease Control and Prevention (CDC). Controlling Asthma. https://www.cdc.gov/asthma/control/