Causes

The main triggers for asthma are allergies, viral infections, autonomic nervous system imbalances that can cause an increase in parasympathetic stimulation, medications, psychological factors, and exercise. Of asthmatic conditions in patients under 30 years old, 70% are caused by allergies. Three major indoor allergens are dust mites, cockroaches, and cats. In older patients, the cause is almost always nonallergic types of irritants such as smog. Heredity plays a part in about one-third of the cases.

51 Ways to Reduce Allergies

51 Ways to Reduce Allergies

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