Sudden deafness, also known as clinical sudden deafness, refers to the sudden onset of sensorineural hearing loss of unknown cause. The cause of sudden deafness has not been clearly identified, but is mainly related to blood supply disorders in the inner ear and viral infections. 1. Disorders of blood supply to the inner ear: the main functions of the inner ear are auditory and balance functions, and the blood supply comes from the labyrinthine artery. When the labyrinthine artery becomes spasmodic, thrombosed or embolized, the patient’s hearing and balance functions may be affected, resulting in hearing loss, dizziness and other uncomfortable symptoms. 2. Viral infections: Many viruses are associated with this disease, and many patients with sudden deafness have a history of upper respiratory infections that cause sudden deafness. There are many other causes of sudden deafness, it is recommended to consult a doctor in time to clarify the condition, under the guidance of the doctor to take the appropriate treatment program, to avoid blindly using their own medication.