Etiology: (a) Trauma: Trauma is an important cause of the disease, mostly occurring in childhood, and the history of trauma is often long forgotten. At that time, because the various components of the nasal septum were not fully developed, no symptoms were shown, and later, with the growth of age, it gradually developed into nasal septal deviation.
(2) Developmental abnormality: The nasal septum was originally composed of several pieces of cartilage, and later it was ossified separately before the bone septum appeared. During the development process, due to various reasons, the development of bone and cartilage is uneven, and deformity or deviation is formed, or talus or crest is formed at the joints between the bones or bone and cartilage of the nasal septum. Adenoid hypertrophy, open mouth breathing since childhood, and high arched hard palate have restricted septal development, and septal deviation may also occur.
(iii) Compression factors: nasal septum can be deviated to one side by tumor or foreign body compression in the nasal cavity.
Main clinical manifestations: The severity of symptoms is related to the degree and type of deviation.
(a) Nasal congestion: alternating or persistent. Simple “C”-shaped deviation or craggy protrusion mostly causes ipsilateral nasal congestion or alternating nasal congestion. With compensatory hypertrophy of the contralateral turbinate and “S” type deviation, it may cause bilateral nasal congestion.
(B) Headache: partial compression of the turbinate by the deviation may cause ipsilateral reflex headache.
(iii) Rhinorrhea: The mucous membrane at the convex side of the deviation or at the crest and talus becomes thin and is often stimulated by airflow or dust, so dry erosion often occurs, resulting in rhinorrhea.