Introduction
Childhood Asthma 
Impact
Symptoms
Triggers
Treatment
  
 
About Asthma » Triggers
 

In most cases, asthma results from a combination of allergic and non-allergic responses to certain substances or conditions. These are called triggers. The most common asthma triggers are:

 
   Allergens, such as pollen, cockroaches and molds
 
Air pollutants and irritants
 
Smoking and secondhand smoke
 
Respiratory infections, including the common cold
 
Physical exertion, including exercise
 
Cold air
  
Certain medications
 
Emotional stress
 

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