Sudden Hearing Loss: Symptoms, Causes, Treatment, and When to See a Doctor

Have you ever woken up one morning and noticed that you couldn’t hear well out of one ear? Perhaps your ear felt blocked, or you noticed a ringing sound.

One possible cause of these symptoms is sudden sensorineural hearing loss (SSNHL), a condition in which hearing decreases suddenly, usually in one ear.

In this article, we’ll explain sudden hearing loss in plain English, including its symptoms, possible causes, treatment options, and how quickly you should see a doctor.

If you think you may be experiencing sudden hearing loss, start with the key steps below. Getting medical attention as soon as possible is important because early treatment may improve your chances of recovery.

What Is Sudden Hearing Loss?

A Condition That Causes Hearing to Drop Suddenly, Usually in One Ear

Sudden hearing loss is a condition in which a person experiences an unexpected decrease in hearing without an obvious cause. It usually affects one ear, while hearing loss in both ears is rare.

Unilateral hearing loss refers to hearing loss in one ear. For more information, see our article, “Unilateral Hearing Loss: Causes, Symptoms, Treatment, and Ways to Improve Hearing in One Ear (2026 Guide)” where we explain the condition in more detail.

Learn more about unilateral hearing loss↗

Normally, sound travels through the ear to the inner ear, where specialized sensory cells convert sound vibrations into electrical signals that are sent to the brain. Sudden sensorineural hearing loss (SSNHL) is a type of hearing loss that occurs when something goes wrong in the inner ear or the auditory system.

We prepared article of “What Is Sensorineural Hearing Loss? Causes, Symptoms, Treatment, and Hearing Aids Explained“. So, please refer it.

Learn more about Sensorineural hearing loss↗

One of the key features of this condition is how suddenly it develops. Unlike hearing loss that gradually worsens over months or years, sudden hearing loss often becomes noticeable at a specific moment. For example, you might wake up one morning and realize that you cannot hear well out of one ear, or notice a sudden change while talking on the phone.

If you would like to learn more about hearing loss in general, including its symptoms, causes, types, and treatment options, see our article, “What Is Hearing Loss? Causes, Symptoms, Types, Diagnosis, and Treatment“.

Learn more about hearing loss↗

Who Is Most Likely to Develop Sudden Hearing Loss?

Sudden hearing loss can affect people of any age, from children to older adults. However, it is most commonly reported among people in their 50s and 60s.

In Japan, more than 70,000 cases are estimated to occur each year. This means that sudden hearing loss is not as rare as many people might think.

It can also affect people who are still working and leading busy lives. Even if you consider yourself healthy, it is important to know the warning signs and understand when to seek medical attention.

Symptoms of Sudden Hearing Loss and a Self-Check

Early Symptoms: Checklist

Have you noticed any of the following symptoms?

• A sudden decrease in hearing in one ear
• A feeling of fullness or blockage in the ear
• Ringing or buzzing sounds in the ear (tinnitus)
• Your own voice sounding unusually loud or echoing in your ear
• Vertigo, or a sensation that you or your surroundings are spinning
• Nausea or vomiting accompanied by dizziness

The main symptoms of sudden hearing loss are reduced hearing, a feeling of fullness in the ear, and tinnitus. Some people also experience vertigo and nausea.

If you recognize even one of these symptoms and it appeared suddenly, you should see an ear, nose, and throat (ENT) specialist as soon as possible.

Please keep in mind that this checklist is only intended to help you recognize warning signs. It cannot confirm whether you have sudden hearing loss. A medical examination and hearing tests are needed to determine the cause.

Conditions That Can Cause Similar Symptoms

Sudden difficulty hearing does not always mean that you have sudden sensorineural hearing loss. Other conditions can cause similar symptoms. Here are some common examples.

Condition	Typical Features
Acute low-tone sensorineural hearing loss	Mainly affects the ability to hear low-pitched sounds. A feeling of fullness in the ear is common, and the condition may recur.
Ménière’s disease	Repeated episodes of vertigo, hearing loss, and tinnitus.
Earwax blockage	A buildup of earwax blocks the ear canal and reduces hearing. Hearing often improves once the blockage is safely removed.
Middle ear infection (otitis media)	May cause ear pain, fever, and reduced hearing.

These conditions can be difficult to distinguish based on symptoms alone. Rather than trying to diagnose yourself, it is best to seek medical attention promptly.

If your hearing suddenly changes, do not assume that it will get better on its own. Seek medical care as soon as possible.

We prepared article of “What Is Low-Frequency Sensorineural Hearing Loss? Causes and Symptoms of Ear Fullness and Difficulty Hearing Low Sounds” and “A Parent’s Guide to Ear Infections in Children: Warning Signs and When to See a Doctor“. So, please refer it.

Learn more about Low Frequency Sensorineural hearing loss↗

Learn more about Ear Infections↗

Causes of Sudden Hearing Loss

The Exact Cause Is Still Unknown

Sudden sensorineural hearing loss (SSNHL) is a type of hearing loss that occurs suddenly without an identifiable cause. In fact, the lack of a clear explanation is one of the defining features of this condition.

Researchers have proposed several possible explanations, including the following:

• Reduced blood flow: Tiny blood vessels supply blood to the inner ear. If blood flow is disrupted, the sensory cells responsible for detecting sound, called hair cells, may be damaged.
• Viral infection: A viral infection may trigger inflammation or damage in the inner ear.

Neither theory has been conclusively proven to explain all cases of sudden hearing loss, and research is ongoing.

We prepared article of “What Are Hair Cells in the Ear? Why Does Damage Cause Hearing Loss?“. So, please refer it.

Learn more about hair cells↗

The Connection Between Stress, Fatigue, and Lack of Sleep

Although the exact cause of sudden hearing loss remains unclear, stress, overwork, and insufficient sleep are sometimes discussed as possible contributing factors. Certain medical conditions, including diabetes, may also be associated with the condition.

However, these factors do not necessarily cause sudden hearing loss. Being stressed or tired does not mean that you will develop the condition.

If you have been going through a particularly busy or stressful period, try to make time for rest and adequate sleep. Most importantly, if you notice a sudden change in your hearing, do not assume that stress or fatigue is the only explanation. Seek medical attention promptly.

Sudden Hearing Loss Is Different From Noise-Induced Hearing Loss

Noise-induced hearing loss, sometimes called headphone-related hearing loss, can develop after prolonged exposure to loud sounds through headphones, earphones, or other sources of noise.

Unlike sudden sensorineural hearing loss, noise-induced hearing loss has a recognizable cause: excessive sound exposure that can damage the delicate structures of the inner ear.

What to Do If You Suspect Sudden Hearing Loss

See an Ear, Nose, and Throat (ENT) Specialist as Soon as Possible

The most important thing you can do is seek medical attention promptly.

In general, treatment for sudden sensorineural hearing loss is more likely to be effective when started early. Starting treatment within the first week after symptoms begin is an important target, and it is best to seek medical care as soon as possible, ideally within the first few days.

It is understandable to think, “Maybe I’m just tired,” or “Perhaps it will get better after a night’s sleep.” However, waiting to see what happens can delay treatment when time matters.

Even if the examination reveals that your symptoms are caused by something less serious, getting checked can give you peace of mind. If your hearing suddenly changes, it is always safer to seek medical advice rather than wait for it to improve on its own.

Choose a Hospital or Clinic With Ear Specialists if Possible

ENT specialists diagnose and treat conditions affecting the ears, nose, and throat. Some have additional expertise in ear-related conditions, including hearing loss.

If you have time, you can check a clinic or hospital’s website to see whether it specializes in ear disorders or hearing problems.

However, do not delay seeking care just to find a specialist. If your hearing has suddenly decreased, visit the nearest ENT clinic that can see you promptly. If more specialized treatment is needed, the doctor can refer you to a larger hospital.

What to Tell the Doctor During Your Visit

To help the doctor assess your condition, it is useful to prepare the following information:

• When your hearing changed: Note the date and approximate time when you first noticed the problem.
• Which ear is affected: The left ear, the right ear, or both.
• Other symptoms: For example, ringing in the ear, a feeling of fullness, dizziness, or nausea.
• Possible recent events: Mention anything relevant, such as a recent cold or exposure to loud noise.
• Your medical history and medications: Include any existing conditions, such as diabetes or high blood pressure, and any medications you are currently taking.

You do not need to have all the answers before your appointment. Simply sharing what you have noticed can help the doctor determine what examinations and treatments may be necessary.

What If You Notice Symptoms at Night or on a Holiday?

If you notice sudden hearing loss at night or on a holiday, the appropriate response depends on your symptoms and the medical services available in your area.

Seek emergency medical care if you experience severe dizziness that makes it difficult to stand or move, or if you have symptoms such as facial numbness, facial weakness, or difficulty speaking. These may indicate a more serious condition that requires urgent assessment.

If sudden hearing loss is your only symptom, look for an ENT clinic offering urgent or holiday appointments. If one is not available, seek medical advice about where to go and when. Do not postpone seeking help simply because your usual clinic is closed.

In Japan, you may also be able to call #7119, the emergency medical consultation service, in areas where it is available. The service can help you decide whether emergency care is necessary and where to seek it.

If you live outside Japan, check your local urgent-care or emergency medical services for guidance.

Diagnosis and Treatment of Sudden Hearing Loss

Hearing Tests and Other Examinations Help Identify the Cause

When you visit a hospital or clinic, the doctor will first ask about your symptoms and when you first noticed the change in your hearing.

You will usually have a hearing test (audiometry) to measure how well you can hear different sounds. During this test, you wear headphones and signal when you hear a sound. The results help the doctor determine how much hearing loss you have and which pitches are affected.

If you also experience dizziness or vertigo, additional tests may be needed to assess your balance. If the doctor suspects another condition, imaging tests such as an MRI may also be recommended.

These examinations help distinguish sudden sensorineural hearing loss (SSNHL) from other conditions that can cause similar symptoms.

Steroids Are the Main Treatment

The main treatment for sudden sensorineural hearing loss is corticosteroid medication, commonly called steroids. These medications help reduce inflammation and are usually given as oral tablets or through an intravenous drip.

Treatment often lasts around one to two weeks, with the dose gradually reduced according to the treatment plan.

Depending on your symptoms and medical condition, your doctor may also prescribe other medications, such as drugs intended to improve blood flow or vitamin supplements. However, the choice of treatment varies from person to person, and the effectiveness of additional medications may differ.

If your hearing loss is severe or you experience significant vertigo, you may need to be admitted to the hospital for treatment and monitoring.

Other Treatment Options

Depending on the medical facility and your condition, other treatment options may be considered.

• Intratympanic steroid therapy: Steroids are injected through the eardrum into the middle ear, allowing the medication to reach the inner ear. This treatment may be used when hearing does not improve sufficiently with initial treatment or when systemic steroids are unsuitable.
• Hyperbaric oxygen therapy (HBOT): You breathe oxygen in a specially pressurized chamber. This increases the amount of oxygen available to your body and may be used as an additional treatment in certain cases.

Not everyone needs these treatments, and their availability varies between medical facilities. Your doctor can explain the potential benefits, risks, and suitability of each option based on your condition.

How to Manage Daily Life and Work During Treatment

Getting enough rest and avoiding unnecessary physical and mental strain are important while you are receiving treatment.

Here are a few practical steps you can take:

• Get enough sleep and allow yourself time to rest.
• Avoid excessively loud sounds and reduce unnecessary noise exposure.
• If possible, take time off work or temporarily reduce your workload.

Taking time off can be difficult, especially when you have work responsibilities. However, giving yourself time to recover is an important part of looking after your health.

If you need time away from work, discussing your situation with your employer and providing medical documentation, if necessary, may help make the process easier.

Chances of Recovery From Sudden Hearing Loss

Recovery from sudden sensorineural hearing loss varies considerably from person to person. A commonly cited general estimate divides outcomes into three groups:

• About one-third: Hearing returns to its previous level or nearly normal.
• About one-third: Hearing improves, but some hearing loss remains.
• About one-third: There is little or no significant improvement.

These figures are general estimates, not a prediction of what will happen in an individual case.

Some reports have also found that among people who begin treatment within the first week, approximately 40% may recover their hearing completely and around 50% may experience some improvement. However, reported recovery rates vary depending on the study, the severity of hearing loss, and how recovery is defined.

The key point is that starting treatment as early as possible may improve the chances of recovery. If you notice a sudden change in your hearing, do not wait for the symptoms to disappear on their own.

Hearing often stabilizes within about one month after the onset of sudden hearing loss, although the timing varies. Some people recover sooner, while others may continue to experience changes over a longer period. Your doctor will monitor your hearing and help you understand how your condition is progressing.

Several factors may be associated with a less favorable recovery, including older age, more severe hearing loss, and significant vertigo. However, these factors do not determine the outcome for every individual.

Even if your hearing does not return completely, support and rehabilitation options may help you manage communication difficulties and improve your quality of life.

Support Options if Hearing Loss Persists

Even after treatment, some people continue to experience hearing loss or tinnitus (ringing or buzzing in the ears).

However, there are several ways to manage these symptoms and make everyday communication easier.

• Hearing aids: Depending on your remaining hearing, a hearing aid may help you hear sounds and speech more clearly. There are also options designed specifically for people who have hearing loss in only one ear. Learn more about hearing aids↗
• Tinnitus management: If you continue to experience ringing or buzzing in your ears, there are ways to manage the symptoms and reduce their impact on daily life. Learn more in our article, What Is Tinnitus? Understanding the Sounds Your Brain Perceives.
• Assistive devices and services: Various tools and services can make communication easier for people with hearing loss. For more information, see our article, “What Is the Hearing Aid Subsidy Under Japan’s Comprehensive Support Act? A Beginner’s Guide to Eligibility, Out-of-Pocket Costs, and How to Apply“.
• Financial assistance and public support: Depending on the severity of your hearing loss and where you live, you may qualify for financial assistance toward the cost of hearing aids or other support services. In Japan, certain public assistance programs are available to eligible individuals.

It is also important to protect the ear with better hearing. Avoid excessively loud sounds and give your ears regular breaks from noise whenever possible.

Even if your hearing does not return completely, the right combination of treatment, assistive devices, and communication strategies can help you maintain your quality of life.

Frequently Asked Questions About Sudden Hearing Loss

Can Sudden Hearing Loss Get Better on Its Own?

Some people experience spontaneous improvement, but it is impossible to predict in advance who will recover without treatment.

Because early treatment may improve the chances of recovery, it is best to seek medical attention rather than wait to see whether your hearing returns on its own.

Can Sudden Hearing Loss Happen More Than Once?

Sudden sensorineural hearing loss generally does not recur frequently. However, if you experience repeated episodes of sudden hearing changes, another condition may be responsible.

For example, Ménière’s disease or acute low-tone sensorineural hearing loss can cause recurring symptoms. If your hearing suddenly changes again, consult an ENT specialist to determine the cause.

Can Sudden Hearing Loss Affect Both Ears?

Sudden sensorineural hearing loss usually affects only one ear. In rare cases, however, it can affect both ears.

If you experience a sudden decrease in hearing in both ears, seek prompt medical attention.

Is It Safe to Use Earphones During Treatment?

During treatment, it is generally a good idea to avoid unnecessary noise exposure and give your ears a break.

If you want to listen to music or watch videos, consider using speakers at a comfortable, low volume instead of earphones. Ask your doctor whether using earphones is appropriate for your particular condition.

Avoid loud sounds, and do not assume that a low volume makes earphone use suitable in every situation.

Can Children Develop Sudden Hearing Loss?

Yes. Sudden hearing loss can also occur in children.

Children may have difficulty explaining that they cannot hear properly. Parents may notice changes such as a child no longer using one ear when holding a phone, responding less consistently when called, or suddenly having difficulty following conversations.

If you notice a sudden change in your child’s hearing, seek medical attention promptly. Do not assume that the problem is simply a temporary ear blockage or an ear infection.

Summary: What You Need to Know About Sudden Hearing Loss

Sudden sensorineural hearing loss is a condition in which hearing decreases unexpectedly, usually in one ear. Here are the key points to remember:

• The exact cause is still unknown. Several factors have been investigated, including problems with blood flow to the inner ear and viral infections.
• Common symptoms include sudden hearing loss in one ear, a feeling of fullness in the ear, tinnitus, and sometimes vertigo.
• Steroid medication is a main treatment option. Starting treatment early may improve the chances of recovery.
• Seek medical attention as soon as possible. Do not ignore a sudden change in hearing or wait for it to improve on its own.

If you suddenly notice that you cannot hear well out of one ear, take it seriously. Your hearing may be giving you an important warning.

I have also experienced the anxiety of rushing to the hospital because of a problem with my child’s ear.

One day, my child started crying and saying, “My ear hurts!” When I asked whether they could hear, they replied, “I can’t hear!” Even though I regularly research hearing loss, I was genuinely worried. I wondered whether it could be sudden hearing loss, so I took my child to an ENT clinic straight away.

Fortunately, the diagnosis was a middle ear infection (otitis media), not sudden sensorineural hearing loss. I remember feeling relieved.

Although it turned out not to be sudden hearing loss, I was glad that we sought medical attention early. We were able to identify the cause and start treatment, and I no longer had to worry about not knowing what was wrong.

You cannot always tell what is causing a change in hearing without a medical examination. Whether it turns out to be sudden hearing loss or another condition, getting checked promptly is one of the best ways to protect your hearing and give yourself peace of mind.

References

National Institute on Deafness and Other Communication Disorders (NIDCD)

American Academy of Otolaryngology–Head and Neck Surgery (AAO-HNS)

National Institute for Health and Care Excellence (NICE)