Question: what factor is not a common trigger for asthma?
Answer: Allergies (Allergic Asthma) Substances that cause allergies (allergens) can trigger asthma. ... 
Irritants in the Air. Irritants in the environment can also bring on an asthma episode. ... 
Other Health Conditions. ... 
Exercise. ... 
Weather. ... 
Feeling and Expressing Strong Emotions. ... 
Medicines.