Dr. Passavit Opassathavorn is an otolaryngologist from Thailand and a graduate of the Otolaryngology–Head and Neck Surgery residency program at the Faculty of Medicine Ramathibodi Hospital, Mahidol University. His clinical and academic interests include rhinology, allergy, and nasal physiology. His research focuses on the intranasal Schirmer test and its potential applications in the assessment of nasal secretion and chronic rhinitis.