A retrospective study of the records of 392 consecutive patients prospectively operated for non-vasomotor nasal obstruction, has allowed us to identify a syndrome that we would call morphological syndrome. This is caused by anatomical deformities of the nasal septum, inferior turbinate hypertrophy frequently found being the most often only a compensation for the septal deviation. This endonasal abnormality, which can be congenital or post-traumatic, is most frequently of developmental origin and therefore most often found in Caucasian men, whose facial and septal growth is considerable. This morphological syndrome comprises unilateral or bilateral nasal obstruction, noisy nocturnal breathing (20% of patients), a posterior nasal drip (38% of patients), frontal headaches (49% of patients) and recurrent viral or bacterial rhinosinusitis (36% of patients). Other associated symptoms include epistaxis, olfactory dysfunction (hyposmia) and the manifestations of eustachian tube dysfunction. That this syndrome exists is confirmed by the effectiveness of septoplastic operation, performed in our hospital according to the method of Cottle, but without any surgical associated intervention on the inferior turbinates. This operation is an effective treatment both in a global fashion (95% of good results) and in relation to each of the symptoms (except postnasal drip) and is stable in the longterm and well tolerated (minor associated morbidity). This study allow us to re-establish the almost exclusive role of the nasal septum in the genesis of morphological nasal obstruction.