Secretory otitis media is a non-suppurative inflammation of the middle ear mucosa, characterized clinically by fluid accumulation in the tympanic chamber and hearing loss. There are acute and chronic otitis media. Diagnostic criteria: 1. Clinical manifestations: (1) History: Acute cases have a history of recent cold or inflammation of the nose and nasopharynx. Chronic cases can be caused by acute cases that have not been treated properly or by recurrent episodes of acute cases. (2) Symptoms: Hearing loss, ear stuffiness or blockage sensation, which can be temporarily relieved by pressing the ear screen or pinching and puffing the nose. (3) Signs: Tympanic membrane invagination (disappearance or deformation of the light cone). Fluid accumulation in the tympanic chamber, the tympanic membrane may become yellowish, amber or see a fluid flat line. Restricted tympanic membrane activity. 2. Auxiliary examinations: (1) Audiometry: pure tone audiometry – conductive deafness. Acoustic conductance – tympanic chamber pressure curve is flat or negative. (2) Nasopharyngeal examination: Exclude adenoid hypertrophy and nasopharyngeal tumor. Treatment principle: remove middle ear fluid, improve the function of the eustachian tube, and treat the etiology. 1. Etiological treatment: (1) Systemic treatment, including treatment of upper respiratory tract infection and anti-allergy. (2) Treat nasal and nasopharyngeal disorders and keep the nasal cavity and the pharyngeal opening of the eustachian tube open. (2) Removal of middle ear fluid, depending on the condition, the following methods can be chosen: (1) tympanic membrane puncture (2) tympanic membrane laser perforation (3) tympanotomy (4) tympanic chamber tube placement (5) tympanic chamber exploratory surgery.