Abstract: 【Objectives】 To analyze the etiologies and clinical characteristics of bilateral sudden sensorineural hearing loss

in order to avoid misdiagnose and missed diagnose. 【Methods】 19 bilateral sudden sensorineural hearing loss suffers whose etiologies could be determined eventually were included. The authors analyzed the etiologies and the clinical characteristics.【Results】 According to the rank of morbidity rate : ①Bilateral inner ear malformation 10 cases

including bilateral enlarged vestibule 5 cases; enlarged vestibular aqueduct 3 cases

enlarged vestibule and vestibular aqueduct 1 case

enlarged vestibule and cochlear hypoplasia 1 case. For the 5 enlarged vestibule malformation cases

the first attack of sensorineural hearing loss showed moderate deafness

and 2 cases got and kept normal hearing after intervention and avoided incentives; 3 cases got better hearing than the attack

the hearing level fluctuated within 60 dB HL. Hearing deteriorated gradually to sever-to-profound loss in the other 5 cases with other type of malformations. ②Psychogenic hearing loss 8 cases

including school children and teen-agers 6 cases with special life background and experience ;mid-aged women 2 cases with special sensibility experience. All 8 cases got hearing rehabilitation after effective cure. ③Lung cancer with brain and internal acoustic meatus metastasis 1 case

whose hearing loss was mild in right ear and profound in left ear. The bilateral hearing loss got no improvement. 【Conclusions】 Bilateral sudden sensorineural hearing loss of children are prone to be misdiagnosed usually. For enlarged bilateral vestibule

vestibular aqueduct and other types of malformation often lead to sever-to-profound hearing loss

the image scan is necessary when the first visitation. Psychogenic hearing loss showed increasing morbidity

and the major suffers were still children. The inducement should be pay close attention to. Lung cancer with internal acoustic meatus metastasis was very rare

and image scan should be proposed for the elderly with bilateral sudden deafness.