Perception of nasal stuffiness, together with rhinomanometric and acoustic rhinometric assessments were evaluated before and after nasal and/or sinus surgery in 50 Japanese adult patients. Nasal resistance on both expiration and inspiration correlated well with the patients' perceptions (P<0.05). Nasal volumes (0-4 cm and 0-7 cm) obtained from acoustic rhinometry measurements also correlated well with perception (P<0.05). No significant relationships were found between rhinomanometric and acoustic rhinometric results. Perceptional nasal obstruction, rhinomanometric and acoustic rhinometric results (except for the sectional areas at the I-notch) improved significantly after the operations. Rhinomanometry and acoustic rhinometry are valuable methods for assessing nasal stuffiness, but we must take account of the differences between the two methods.