Asthma Triggers – What Causes Flare-Ups and How to Avoid Them

What Are Asthma Triggers?

Understand the top asthma triggers in the U.S. and how to minimize attacks. Learn about allergens, environmental factors, and trusted treatment brands that help prevent symptoms.

Asthma triggers are substances, environmental conditions, or activities that can cause or worsen asthma symptoms. In sensitive individuals, these triggers lead to airway inflammation, tightening of the muscles, and increased mucus production, which together make breathing difficult.

Knowing and avoiding your triggers is a critical part of asthma management and helps reduce the frequency and severity of attacks.

Common Asthma Triggers in the U.S.

1. Allergens

Dust mites, pollen, mold spores, pet dander, and cockroach droppings

Often seasonal and can vary by region

2. Air Pollution and Smoke

Outdoor pollution (ozone, smog)

Indoor pollutants(secondhand smoke, scented candles, cleaning products)

Wildfire smoke is a growing trigger, especially in Western U.S. states

3. Weather Changes

Sudden drops in temperature

Cold air inhalation

High humidity levels

4. Exercise-Induced Asthma

Physical activity, especially in cold or dry air, can provoke symptoms

Common among children and young athletes

5. Respiratory Infections

Colds, flu, and COVID-19 can worsen asthma

Viruses are one of the leading causes of asthma hospitalizations

Less Common Triggers

Strong emotions or stress

Certain medications (NSAIDs, beta-blockers)

Sulfites in food and wine

GERD (acid reflux)

Managing and Preventing Asthma Triggers

Allergy-proof your home: use air purifiers, clean bedding regularly, and vacuum with HEPA filters

Monitor air quality and stay indoors on high-pollution or pollen-count days

Use a rescue inhaler or controller medication as prescribed

Follow an asthma action plan developed by your doctor