Allergic rhinitis, a known risk factor for asthma onset, often accompanies mouth breathing. Mouth breathing may bypass the protective function of the nose and is anecdotally considered to increase asthma morbidity. However, there is no epidemiological evidence that mouth breathing is independently associated with asthma morbidity and sensitization to allergens. In this study, we aimed to clarify the association between mouth breathing and asthma morbidity and allergic/eosinophilic inflammation, while considering the effect of allergic rhinitis.

Mouth breathing is not independently associated with asthma morbidity and allergic/eosinophilic inflammation, but may be a risk factor for asthma onset in individuals with allergic rhinitis.

Paper

Mouth breathing, another risk factor for asthma: the Nagahama Study

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