A sudden decline in hearing, particularly in one ear, may be a medical emergency requiring urgent examination rather than an assumption that it is caused by earwax buildup or congestion. The condition may begin with a blocked or pressured feeling or sudden tinnitus, symptoms that can delay diagnosis because they resemble more common and less serious problems.
Defining sudden hearing loss and when not to wait
The first seven days are especially important, as patients who receive early treatment are about 5 times more likely to recover their hearing than those whose treatment is delayed. The outcome is not guaranteed in every case, but early diagnosis and intervention give patients the best possible chance of improving their hearing.
Tinnitus and its psychological impact on patients
Tinnitus occurs in between 80% and 90% of patients, and the brain is thought to generate internal sounds in an attempt to compensate for lost auditory signals. Its impact may extend beyond hearing, as tinnitus is associated with psychological and social problems, including suicidal thoughts in some patients. Hearing depends on sound travelling through the outer and middle ear to the inner ear, followed by signals being transmitted by the auditory nerve to the brain.
Conductive hearing loss results from a problem that obstructs the transmission of sound, such as earwax blocking the ear canal, middle-ear inflammation or a disorder of the hearing bones. Sensorineural hearing loss is linked to dysfunction or damage in the tiny cells inside the cochlea or in the auditory nerve.
Unknown causes and multiple theories for hearing loss
Some forms may be associated with ageing, chronic noise exposure, disease and genetic factors, or medicines that affect hearing, while both types may occur in the same patient, known as mixed hearing loss. No single confirmed cause explains most cases of sudden sensorineural hearing loss, and the causes of about 90% of cases remain unknown.
Proposed theories include inflammatory or immune mechanisms, disturbances in the cochlea’s microcirculation and certain viral factors, but none applies to all patients. Abdel Fattah explains that classifying the condition as idiopathic does not make it less serious; it means that no clear cause can be established in the patient.
Random viral or immune testing is therefore not recommended for every case. Tests should instead be determined by the patient’s medical history and clinical examination. Most cases are not a direct genetic disease passed from parents to children, although research is examining whether genetic predispositions may increase some people’s susceptibility.
The condition can also occur in young people, athletes and healthy individuals, and is not limited to older adults or people with chronic diseases. Estimates indicate that about 66,000 cases are recorded annually in the United States.
Corticosteroids are the early first-line treatment option
Abdel Fattah nevertheless cautions against asserting that the disease is becoming more prevalent without strong and consistent epidemiological data, noting that an increase in diagnosed cases may reflect greater awareness, the availability of hearing tests and easier access to healthcare. Corticosteroids are the main treatment a doctor may discuss with a patient during the first two weeks after symptoms begin, following an assessment and the exclusion of causes requiring different treatment.
If sufficient improvement is not achieved, the drug can be injected into the middle ear as a salvage treatment. Guidelines generally recommend offering this option within 2 to 6 weeks of symptom onset. Hyperbaric oxygen may be used with corticosteroids in some patients during the early stage or as a salvage treatment, but it does not guarantee hearing recovery.
Current guidelines also do not recommend the routine use of antivirals or vasodilators to treat sudden sensorineural hearing loss. Studies are examining more efficient ways to deliver medicines to the cochlea and retain them there for longer, alongside regenerative and genetic treatments and therapies targeting inflammatory and vascular mechanisms.
Although some formulations have produced promising preliminary results, they remain under investigation and have not become an established medical standard. No guaranteed way exists to prevent most cases because their causes are unknown, but protecting the ears from noise, controlling diabetes and high blood pressure, and maintaining vascular health generally support hearing health.
When a sudden decline occurs, the essential step remains having a hearing test and seeing an ear, nose and throat doctor as soon as possible. There is no definitive cure for tinnitus, but cognitive behavioural therapy, tinnitus retraining, sound therapy and hearing aids may help reduce its impact and improve patients’ ability to live with it, alongside modern therapeutic techniques that remain under development.
