[The etiology and related factors of Eustachian tube dysfunction].

The Eustachian tube connects the middle ear and the nasopharynx. It's physiological functions include ventilating and balancing the pressure inside and outside the middle ear, drainage of the middle ear secretions, prevention of retrograde infection, sound suppression and noise suppression. Eustachian tube dysfunction is closely related to the occurrence and development of many diseases. It's etiologyand influencing factors are still unclear. This article reviews the recent research on etiology and related factors of Eustachian tube dysfunction,and strives to make breakthroughs in etiology and mechanism, so as to provide help for clinical intervention.