多数咽鼓管功能不良者在飞机上升或下降时有耳部不适感但很少引起内耳气压损伤。施行过中耳手术且咽鼓管无调节功能的乘客飞行中则可能引起内耳严重损伤,尤其在术后短时内就乘机者多见。根据乳突气化程度,中耳腔含气量约为2.5～13ml,其容积与外界气压改变有关。飞机上升时中耳气压梯度达15mmHg 即引起咽鼓管自行开放排气。下降过程则需做主动通气动作平衡中耳内外压力差.气压变化使鼓膜运动并牵动听骨链。鞍座式槌砧关节通过滑动运动使鼓膜的内外移动变为砧骨长脚的上下运动, Most eustachian tube dysfunction in the aircraft when the rise or fall ear discomfort, but rarely cause air pressure damage the inner ear. Passengers who have undergone surgery for the middle ear and have no regulatory function on the eustachian tube may cause severe damage to the inner ear, especially in the short time after the operation. According to the degree of mastoid gasification, the gas content of the middle ear cavity is about 2.5 ~ 13ml, the volume changes with the outside world pressure. When the aircraft rises in the middle ear pressure gradient of 15mmHg that eustachian tube caused by its own open exhaust. The descending process is required to do active ventilation to balance the pressure inside and outside the middle ear pressure changes in the tympanic membrane movement and affect the ossicular chain. The saddle anvil joint moves the inside and outside of the tympanic membrane into the up-and-down movement of the incus long leg by the sliding movement,