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What can cause asthma flare ups in adults? 

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Thus, asthma symptoms beginning in adults might have originated in childhood.
Asthma exacerbations or ‘attacks’ are acute episodes of progressive worsening of symptoms which occur in patients with all degrees of asthma severity and are an important cause of morbidity and mortality.
Seasonal variations in asthma attacks in young adults are common and are different depending on sensitisation to outdoor, but not indoor, allergens.
This study suggests that air pollution plays a role in acute exacerbation of asthma in children but not in adults.
Avoiding these triggers can reduce the number of asthma attacks.

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