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Sudden Deafness

"Idiopathic sudden sensorineural hearing loss (SSNHL), also known as sudden deafness, is defined as the onset of unexplained one-sided SNHL in less than 72 hours.It strikes an estimated 5-20/100,000 persons per year. This is approximately the same incidence as Meniere’s syndrome (15 per 100,000), and nearly as common as Bell’s Palsy (20-30 per 100,000)..."

http://www.masseyeandear.org/for-patients/patient-guide/patient-education/diseases-and-conditions/sudden-deafness/