What factors can cause or trigger allergic asthma?
A family history of allergies is the most important predictor of whether a person will develop asthma. Environmental substances (allergens) can trigger an exacerbation – or attack – in patients with allergic asthma. The allergens include tree, grass, and weed pollen, plus molds, animal dander, dust mites and cockroach droppings. Asthma attacks can also be triggered by viral infections, exercise, cold air and non-specific irritants.
