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Allergies and Asthma It's estimated that at least half of us suffer from one or two allergies - whether it's to seasonal allergens, food or something else. Allergies that are not controlled can set the stage for the development of asthma - or worsen asthma symptoms. It's estimated that at least half of us suffer from one or two allergies - whether it's to seasonal allergens, food or something else. Allergies that are not controlled can set the stage for the development of asthma - or worsen asthma symptoms.