When the upper respiratory tract is infected, the mucous membrane of the nasal cavity becomes congested and swollen, causing the mucous membrane of the eustachian tube to become congested and swollen, so that air cannot enter the tympanic chamber through the eustachian tube, resulting in negative pressure inside the tympanic chamber, which manifests as a blocked ear, or ear stuffiness. On examination, the tympanic membrane is seen to be invaginated, with a partially visible liquid level and a B-shaped curve of acoustic impedance. Treatment of upper respiratory tract infection, such as oral cefprozil, nasal spray trimethoprim, reduce the edema of the nasal cavity and nasopharynx, facilitate the reduction of pharyngeal edema, and add hormones if necessary. If the above comprehensive treatment is not effective, tympanic membrane aspiration and intra-drum injection can be considered.