Sudden tinnitus is a sudden onset of tinnitus without warning. Tinnitus occurs in a flash, mostly within a few hours to a day or two, and in a few cases is accompanied by nausea, vomiting and vertigo, with the maximum tinnitus peaking in less than 48 hours. The main etiology of sudden tinnitus is unclear and may be related to the following factors, such as viral infection, vascular lesions, rupture of the vagus membrane, and fluid accumulation in the membranous vagus. Sudden tinnitus often occurs in middle-aged people, with varying degrees of severity, mostly in conjunction with deafness. When it occurs, the patient feels a sudden “thumping” or “clicking” sound in the ear, followed by a loss of hearing. This phenomenon is caused by trauma to the inner ear, infection, syphilis, drug poisoning, auditory neuroma, etc. The disease can also be triggered by cold, fatigue, emotional excitement, alcohol consumption, and forceful nose blowing. Tinnitus can also affect the patient’s mood, hearing, sleep, and work. Although sudden tinnitus has a certain rate of self-healing, you should not wait passively. It must be regarded as an otologic emergency and treated early. A comprehensive audiological examination, otolaryngological examination and relevant internal examinations should be performed so as not to miss the best time for treatment.