Sudden sensorineural hearing loss (SSNHL), also known as sudden deafness, is an audiological emergency characterized by a swift decrease of over 30 dB in sensorineural hearing loss across at least three consecutive frequencies in less than 3 days. SSNHL can be idiopathic in cases with an unknown cause or non-idiopathic. The reported occurrence of SSNHL varies widely, with rates of 27 and 60 per 100,000 people per year in the United States and the European Union, respectively. The incidence of SSNHL does not differ between sexes. Clinical presentation typically includes unilateral sensorineural hearing loss, often accompanied by tinnitus and, in some cases, vertigo. Diagnosis is established through a comprehensive evaluation, including history taking, physical examination, and audiometric assessment. Corticosteroids alone or in combination with hyperbaric oxygen may be offered as treatment options. Corticosteroids can be given either systemically or locally via the middle ear. However, a significant percentage of patients’ hearing will spontaneously recover. SSNHL patients with residual hearing loss and/or tinnitus should be counseled about the possible benefits of audiologic rehabilitation and other supportive interventions.