According to research published in the Journal of Allergy and Clinical Immunology: In Practice, 62% of bronchiectasis patients suffer from chronic rhinosinusitis.

CRS was also linked to a reduced sense of smell, elevated levels of inflammatory markers, and shorter time to first exacerbation.

Because the upper and lower respiratory tracts share the same mucosal lining, CRS could conceivably affect the severity and symptoms of bronchiectasis. For example, secretions from the upper airway containing bacteria could migrate to the lower airway.