Asthma Flareups: Symptoms, Causes, Diagnosis, and Prevention Explained

What Are Asthma Flareups?

Asthma flareups — also called asthma attacks or exacerbations — are episodes when asthma symptoms suddenly get worse. During a flareup, the airways become inflamed, swollen, and produce extra mucus. This makes breathing very difficult. Flareups can range from mild to life-threatening.

Common Triggers

• Allergens — dust mites, pet dander, pollen, cockroaches, mould
• Respiratory infections — viral colds, flu, COVID-19
• Air pollution — vehicle exhaust, industrial smoke, burning crop waste
• Exercise — exercise-induced bronchoconstriction
• Weather changes — cold air, humidity changes
• Strong smells — paint, perfume, cleaning products
• Emotions — stress, laughter, crying
• Medications — aspirin, NSAIDs, beta-blockers in some patients
• Gastro-oesophageal reflux — acid reflux can worsen asthma

Recognising Severity

Mild flareup: Mild wheeze, able to speak full sentences, responds to rescue inhaler within 20 minutes.

Moderate flareup: Noticeable wheeze, only able to speak partial sentences, rescue inhaler provides partial relief.

Severe flareup: Severe difficulty breathing, cannot complete sentences, rescue inhaler not helping, respiratory rate above 30/minute.

Diagnosis

Asthma is diagnosed with: detailed medical history and symptom pattern, spirometry (lung function test), peak flow measurement, allergy tests, and chest X-ray to rule out other conditions.

Management of a Flareup at Home

• Sit upright — do not lie down
• Use your rescue (reliever) inhaler — 2–4 puffs every 20 minutes
• Stay calm — anxiety worsens breathlessness
• If no improvement after 3 doses — seek emergency care
• Keep a record of your symptoms and triggers

Long-Term Prevention

• Take preventer (controller) inhaler daily as prescribed
• Identify and avoid your personal triggers
• Have a written Asthma Action Plan from your doctor
• Monitor peak flow readings at home
• Annual flu vaccination
• Regular review with your doctor every 3–6 months