This study aimed to standardize the diagnosis and treatment of rhino-bronchial syndrome (RBS), which links inflammation of the upper and lower airways. 159 patients meeting criteria for RBS underwent a two-level diagnostic protocol including endoscopy and spirometry. RBS was confirmed in 116 patients who had higher rates of allergic and infectious diseases than unconfirmed cases. Common symptoms were nasal obstruction, rhinorrhea, cough, and dyspnea. After 3 months of treatment including steroids, antibiotics, and nasal lavage, 96% of patients recovered. The study proposes a diagnostic workflow and highlights the importance of correct diagnosis through multidisciplinary evaluation for effective treatment of RBS.