Sudden deafness is mainly diagnosed from the following aspects: 1, sudden hearing loss occurs within 72 hours and the two adjacent frequencies, hearing loss is greater than or equal to 20dB; 2, no obvious etiology; 3, in addition to obvious hearing loss, sudden deafness may be accompanied by vertigo, stuffiness, abnormal sensation of the skin around the ear and rehearing in the ear, and some patients are accompanied by nausea and vomiting; 4, audiological and imaging Tests, such as cranial and internal auditory tract MRI to exclude occupying lesions; 5. Hematological tests, such as blood glucose, blood lipids, coagulation function, blood routine; 7. Pathogenetic tests, such as mycoplasma, varicella virus, herpes virus, syphilis, AIDS, etc. Sudden deafness can be diagnosed based on a combination of factors.