炎症累及中耳(包括咽鼓管、鼓动室、鼓窦与乳突气房)全部或部分结构者称为中耳炎。1.非化脓性中耳炎:是因咽鼓管功能不良使中耳内产生负压,引起鼓膜内陷、血管扩张、渗液、积液造成听力减退和自声增强的症状。2.化脓性中耳炎:是细菌感染所致。急性的继发于上呼吸道感染,发炎而化脓,如侵及骨壁可牵连乳 Inflammation involving the middle ear (including the eustachian tube, agitating chamber, the sinuses and mastoid air room) all or part of the structure known as otitis media. 1. Non-suppurative otitis media: Eustachian tube dysfunction to produce negative pressure in the middle ear, causing tympanic membrane retraction, vasodilation, exudate, effusion caused by hearing loss and increased self-acoustic symptoms. 2. suppurative otitis media: caused by bacterial infection. Acute secondary to upper respiratory tract infection, inflammation and suppuration, such as invasion and bone wall can be implicated in milk