Mostly idiopathic
Prognosis depends on severity of<unk>  loss
Incidence estimates range from 2-20 per 100,000 people per year
Most commonly 43-53 years of age
Men and women affected equally
Sudden sensorineural hearing loss
Acute stroke, usually AICA occlusion
Bilateral red eyes
Multiple Sclerosis
Acute vision loss 
Meningitis
Unilateral red eye
Vestibular schwannomas