在人体的鼻咽部和中耳腔之间有一管道,叫咽鼓管,它的主要功能是调节中耳腔内外的气压平衡。正常情况下,在吞咽或打呵欠时,咽鼓管便开放,中耳腔内的分泌物可以通过咽鼓管从鼻咽部排出,空气也可以从鼻咽部自由地进入中耳腔。如果咽鼓管粘膜肿胀,管腔阻塞,致使中耳的通气、引流不畅,便会造成中耳积液,导致非化脓性中耳炎的发生。非化脓性中耳炎又称分泌性中耳炎,其产生的原因是多方面的,如急性上呼吸道感染、鼻腔或鼻咽部疾病(鼻炎、鼻咽部增殖体肥大)、腭裂、变态反应等,均可引起咽鼓管阻塞导致此病。小儿由于机体抵抗力弱、易患急 In the human body between the nasopharynx and the middle ear cavity has a tube, called the eustachian tube, its main function is to regulate the pressure inside and outside the middle ear cavity balance. Under normal circumstances, swallowing or yawning, the Eustachian tube is open, the secretion of the middle ear cavity Eustachian tube can be discharged from the nasopharynx, the air can also freely enter the middle ear cavity from the nasopharynx. If the eustachian tube mucosal swelling, lumen obstruction, resulting in the middle ear ventilation, poor drainage, it will cause the middle ear effusion, leading to non-suppurative otitis media. Non-suppurative otitis media, also known as secretory otitis media, its causes are many, such as acute upper respiratory tract infection, nasal or nasopharyngeal diseases (rhinitis, nasopharyngeal enlargement body hypertrophy), cleft palate, allergy, etc. Eustachian tube caused the obstruction caused by the disease. Pediatric resistance due to weak, prone to urgency