Nasal septal deviation (NSD) is a common condition in otorhinolaryngology practice. The aim of this study was to investigate the possible relationship between localization and severity of NSD, and related complaints as well as to suggest a simplified assessment method for NSD. Seventy-five patients who complaint nasal obstruction were enrolled this study. The affected nasal cavity was divided into 4 separate sections as follows: antero-superior (AS), antero-inferior (AI), postero-superior (PS), and postero-inferior (PI). Each section was determined according to its relationship to the both superior edge and head of the inferior turbinate. The NSD score was calculated separately for each section according to its relationship with lateral nasal wall. The NSD-related complaints were assessed via the Nasal Obstruction Symptom Evaluation (NOSE) scale. There were 42 male and 33 female patients, with an age range of 18 to 44 years. The mean NSD score was 2.18 +/- 0.63 for AS section, 1.92 +/- 0.67 for AI section, 1.54 +/- 0.70 for PS section, and 1.18 +/- 0.60 for PI section. The mean total NSD score was 6.84 +/- 1.97 while the mean NOSE score was 12.5 +/- 5.11. There was a strong positive correlation between total NSD and NOSE scores when the NSD score was 6 or more (r = 0.9556). This correlation was also present when each section was evaluated separately. The strongest correlation was detected for AS section deviations. Our septal classification system provides a simple and effective evaluation of NSDs. The NSDs which affect internal valve are more related with nasal obstruction and patients' discomfort.