Sudden hearing loss

If your hearing deteriorates without warning, there may be various reasons for this. Sudden hearing loss usually occurs unexpectedly and typically affects only one ear. Those affected often describe a dull sensation or ringing in the ears as the first signs. The following information covers possible triggers, typical symptoms and the steps to take to seek medical advice, without providing any medical recommendations.

What is sudden hearing loss?

Sudden hearing loss describes an acute decline in hearing without any identifiable external cause. Distinguishing between different forms and understanding the timeline helps to better comprehend the symptom.

Definition and timeline

Experts refer to sudden hearing loss when the hearing impairment occurs within 24 to 72 hours. Many people affected notice the change immediately upon waking or within a few hours. The severity can vary greatly. Whilst some people only perceive a slight muffling of certain frequencies, others may experience significant hearing loss, or even complete deafness , in the affected ear.

In the vast majority of cases, sudden hearing loss affects only one ear. This unilateral nature can impair spatial hearing and orientation in everyday life. Directional hearing - the ability to recognise the direction from which a sound is coming - may consequently be limited.

Sudden hearing loss as a diagnosis of exclusion

The term ‘sudden hearing loss’ is often used synonymously with ‘sudden hearing loss’, but medically speaking it refers to a specific form. Sudden hearing loss is what is known as a diagnosis of exclusion. The doctor only makes this diagnosis once all other possible causes of hearing loss have been ruled out. Sudden sensorineural hearing loss is therefore also referred to as idiopathic hearing loss, meaning that there is no identifiable external or organic cause.

This distinction is important, as sudden hearing loss can be triggered by many different factors. Only a medical examination can clarify whether it is sudden sensorineural hearing loss in the strict sense or whether there is another cause that may be treatable.

Typical symptoms and warning signs

Sudden hearing loss is often accompanied by other symptoms that can serve as warning signs. These accompanying symptoms help to assess the extent of the impairment.

The feeling of cotton wool and pressure

Many people report a dull sensation in the ear as the first sign, which is often compared to the feeling of having cotton wool or water in the ear canal. This sensation of pressure can be unpleasant and is often described as a blocked ear. Voices, music and ambient sounds may sound strange or distorted.

The sensation of cotton wool does not always indicate a serious condition. Even harmless causes, such as a blockage of earwax , can trigger similar sensations. This is precisely why a medical examination is advisable to determine the actual cause.

Ear noises and tinnitus

Ringing in the ears often occurs alongside sudden hearing loss. This tinnitus can manifest as whistling, humming, hissing or ringing and is only perceived by the person affected. The ringing in the ears can vary in intensity and duration. In some people, it disappears after a short time; in others, it persists for a longer period.

In some cases, sounds are also perceived as distorted. This so-called dysacusis can cause certain frequencies to sound different from usual or result in sounds being heard twice. Such distortions can impair speech comprehension in everyday life.

Dizziness and balance problems

As the vestibular system in the inner ear is closely linked to the cochlea, sudden hearing loss can also cause feelings of dizziness. Those affected report light-headedness, unsteadiness when walking or a sensation of spinning. These vestibular symptoms may indicate more severe involvement of the inner ear.

Not every case of sudden hearing loss is accompanied by dizziness. However, the occurrence of balance disorders can provide additional information for the treating doctor and should be mentioned during the medical history.

An overview of possible causes

The triggers for sudden hearing loss are varied. Various factors come into play, ranging from mechanical blockages and circulatory disorders to infections.

Mechanical and physical triggers

One of the most common and easiest-to-treat causes is a blockage of earwax that completely obstructs the ear canal. This blocks the transmission of sound to the eardrum and can cause sudden hearing loss. An ENT specialist can usually remove such a blockage quickly and easily. Changes in pressure

can also put strain on the ear. Extreme pressure fluctuations can occur during air travel, diving or when straining hard, which in rare cases can damage the inner ear. Similarly, physical impacts such as a blow to the ear, a head injury or acoustic trauma caused by extreme noise can affect the sensitive structures within the ear.

Circulatory disorders and so-called ear infarction

A widely held theory suggests that circulatory disorders in the fine blood vessels of the inner ear can lead to an insufficient supply of blood to the hair cells. This theory has given sudden hearing loss the colloquial name ‘ear infarction’. The fine hair cells in the inner ear rely on good blood flow to convert sound waves into nerve signals.

Medical literature discusses high blood pressure, elevated cholesterol levels and diabetes, amongst other factors, as possible risk factors for circulatory disorders. However, a direct link has not been conclusively proven scientifically, which is why sudden hearing loss is considered idiopathic, i.e. without any identifiable cause.

Infections and inflammation

Various infections can impair hearing. Viral infections are suspected of attacking the auditory nerve or the inner ear. These include, amongst others, herpes viruses, mumps, measles or influenza viruses. Bacterial infections such as acute middle ear infection can also lead to temporary hearing loss due to swelling and the build-up of fluid.

Anyone wishing to learn more about the different types of hearing loss will find further information on the various forms and their characteristics.

Stress as a possible contributing factor

For a long time, stress was regarded as the main cause of sudden hearing loss. Today, medical research tends to view it as a contributing factor. Many people affected report periods of emotional stress prior to the onset of hearing loss. The theory suggests that stress hormones such as adrenaline may constrict blood vessels and thus impair blood flow to the inner ear. However, a clear scientific link has not been proven.

Medicines and other factors

Certain medications can damage the inner ear and are therefore referred to as ototoxic. These include, amongst others, some antibiotics, certain loop diuretics and some chemotherapeutic agents. In rare cases, high-dose aspirin can also impair hearing. If you suspect medication-induced hearing loss, you must

inform your doctor. Neurological conditions such as a benign tumour of the auditory nerve (acoustic neuroma) or autoimmune diseases can, in rare cases, cause sudden hearing loss. These causes are investigated as part of the medical diagnosis.

The path to medical diagnosis

In the event of sudden hearing loss, a prompt medical examination is important to determine the cause and prevent potential further damage. The ENT specialist has various diagnostic methods at their disposal.

Medical history and basic examination

The examination begins with a detailed consultation. The doctor will ask about the exact circumstances of the hearing loss, any accompanying symptoms, existing medical conditions and any medication being taken. This information provides important clues as to possible causes.

During the physical examination, the doctor first inspects the ear canal using an otoscope. This allows them to determine whether there is a blockage caused by earwax or whether the eardrum has changed. Tuning fork tests, such as the Weber test, help to distinguish between conductive and sensorineural hearing loss.

Hearing tests and further diagnostics

A pure-tone audiogram determines exactly which frequencies are affected and how severe the hearing loss is. In this hearing test, various tones are played at different volumes to determine the hearing threshold. The result provides information on the severity and type of hearing loss.

Depending on the suspected diagnosis, further investigations may be necessary. Imaging techniques such as MRI or CT scans help to rule out tumours, inflammation or other structural changes. Blood tests can provide indications of infections, inflammatory markers or autoimmune diseases.

Treatment options and prognosis

The treatment of sudden hearing loss depends on the underlying cause and the severity. The decision on the appropriate treatment is made by the attending doctor.

Wait-and-see approach under medical supervision

In many cases, spontaneous improvement occurs within hours to a few days. The symptoms may disappear on their own. In cases of mild hearing loss, the doctor may therefore recommend a wait-and-see approach initially and monitor the progression. The rate of spontaneous recovery is considered relatively high in the specialist literature.

A wait-and-see approach does not mean ignoring the hearing loss. Regular check-ups ensure that any deterioration is detected in good time and that further measures can be taken if necessary.

Medication options

Various treatment approaches are available in medical practice, and the doctor will weigh up their use on a case-by-case basis. Which method is suitable in an individual case depends on numerous factors and can only be decided upon following a specialist assessment. Treatment should always be carried out under medical supervision, as the choice of medication depends on various factors.

The treating doctor can explain the pros and cons of different options and make a decision together with the patient.

Living with permanent hearing loss

In some cases, hearing loss does not fully resolve. If permanent hearing loss remains, there are various technical aids that can support hearing ability. Hearing aids amplify incoming sounds and can make everyday communication easier. In cases of unilateral deafness, there are special systems that transmit sound from the affected ear to the healthy one.

For people with permanent hearing loss, auditory training can also be a useful addition. This trains the brain to process acoustic signals more effectively and make the best use of remaining hearing ability. In more severe cases, cochlear implants may also be an option, which the doctor can explain if necessary.

Prevention and risk minimisation

Sudden hearing loss cannot be prevented with certainty, as the exact causes often remain unknown. Nevertheless, there are some factors that may help reduce the overall risk of hearing problems.

Noise protection and hearing care

Prolonged exposure to noise can damage the inner ear and impair the sensitive hair cells. Anyone regularly exposed to loud noise, for example at work or during leisure activities such as concerts, should ensure they use appropriate hearing protection. Listening to music at high volumes through headphones can also strain your hearing over time.

The ear canal should be cleaned gently. Using cotton buds in the ear canal can push earwax deeper into the canal and, in the worst case, damage the eardrum. The ear’s natural self-cleaning mechanism is sufficient in most cases.

General health care

As circulatory problems are discussed as a possible factor in hearing loss, a generally health-conscious lifestyle may be beneficial. Regular exercise, a balanced diet and avoiding smoking can support blood circulation throughout the body.

Regular check-ups, including hearing tests, can help to detect changes in hearing at an early stage. At the first signs of hearing problems, it is advisable to seek prompt medical advice to identify possible causes and, if necessary, take appropriate action.

Important note

The following overview is provided for general information purposes only and does not replace medical advice, diagnosis or treatment. The content provided here is not to be understood as medical recommendations and should not be used as a basis for self-diagnosis or treatment decisions. A qualified doctor should always be consulted in the event of complaints, symptoms or health-related questions. Prompt specialist assessment is particularly important in the event of sudden hearing loss. The content has been compiled with care but does not claim to be exhaustive or up to date. Liability for any damage arising from the use or non-use of the information provided is excluded.