Objective: To investigate the clinical characteristics, diagnostic methods, and treatment of sudden deafness caused by inner ear hemorrhage. Methods: MRI 3D-FLAIR was used to diagnose inner ear hemorrhage in patients with sudden sensorineural hearing loss(SSNHL). The clinical data, hematological examination, audiological examination, vestibular function test, and prognosis were analyzed. The results were compared with those of patients without inner ear hemorrhage. Results: 25 patients with inner ear hemorrhage showed high signal intensity in different parts of the inner ear (cochlea, semicircular canal, vestibule). According to the frequency and degree of hearing loss, 19 cases (76.0%) were total deafness type. According to the average hearing threshold classification, 24 cases (96.0%) were extremely severe deafness. 21 cases had persistent vertigo. Treatment outcomes were poor, and 3 cases (12.0%) were ”aggravated.” Compared with the control group (40 cases) without inner ear hemorrhage, there were significant differences in the degree of hearing loss, accompanying symptoms, and vestibular function. There was no significant difference in the efficacy between the two groups. Conclusion: The clinical manifestations of sudden deafness due to inner ear hemorrhage are serious, with poor prognoses. MRI 3D FLAIR is the preferred diagnostic method for inner ear hemorrhage. T1WI and 3D FLAIR sequences show abnormally high signal intensity. Hemorheological therapy should be used with caution before MRI diagnosis.