The other two chronic obstructive pulmonary diseases are chronic bronchitis and emphysema. Chronic bronchitis is caused by small abnormalities in the airways. Emphysema is caused by destruction of the alveolar walls. Asthma is NOT caused by allergies. A trigger is a factor in the environment that can cause an asthma attack in an asthmatic person, but does not effect non-asthmatics.
Allergens are one type of trigger for people who are asthmatic.
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