Vestibular Schwannoma: Symptoms, Tests and Treatment

A vestibular schwannoma diagnosis raises several different questions: what the scan shows, what is happening to hearing or balance, and whether treatment is needed now. This guide explains the condition, the main management options, and the support available for everyday difficulties. It is intended to help you prepare for a specialist conversation, whether you are newly diagnosed, having surveillance scans, or recovering from treatment.

This article provides general educational information and cannot diagnose symptoms or select treatment for an individual. A qualified healthcare professional should assess new or changing symptoms. Read our medical disclaimer.

What is a vestibular schwannoma?

A vestibular schwannoma is a noncancerous tumor associated with the nerve connecting the inner ear and brain. Acoustic neuroma is another name for the same condition. The word benign describes its noncancerous nature; it does not mean that its position or effects can be ignored. ²

The tumor develops from Schwann cells, which support and insulate nerves. It usually arises from the vestibular, or balance, part of the eighth cranial nerve. This nerve travels alongside structures involved in hearing and facial movement in a confined area inside the skull. A growing tumor can affect these neighboring structures, explaining why a problem beginning on a balance nerve can first become noticeable as hearing difficulty. Pressure on the trigeminal nerve can cause facial numbness, while involvement of the facial nerve can affect facial movement. These are different functions controlled by different nerves. Most tumors affecting only one side occur sporadically, rather than as part of an inherited syndrome. The diagnosis therefore does not automatically mean that relatives have the same condition. ¹

Location matters because the skull offers limited room for an expanding mass. A larger vestibular schwannoma can press on nearby brain structures or interfere with the circulation of cerebrospinal fluid, the fluid surrounding the brain and spinal cord. Fluid buildup is called hydrocephalus and can be serious. This is one reason clinicians consider the tumor’s relationship to surrounding structures as well as its measured diameter. It is also why a reassuring word such as benign should be followed by a clear explanation of the individual findings. Conversely, the possibility of pressure complications does not mean every newly found tumor is an emergency. The scan, symptoms, examination, and specialist assessment determine the significance of the diagnosis. ³

Symptoms: hearing, tinnitus, and balance

Changes in hearing may develop gradually

Hearing loss often affects one ear more than the other and may develop slowly enough to become apparent during telephone calls or conversations. Some people notice ringing in the affected ear, unsteadiness, or a sense that their hearing has become less reliable. Symptoms and tumor growth vary between individuals. Importantly, hearing can deteriorate even when imaging does not show measurable enlargement. A stable scan therefore does not answer every question about day-to-day function. Describe any change in clarity, not just whether sounds seem quieter, and tell the team which listening situations have become difficult. Neither the intensity of a symptom nor a comparison with another patient reliably tells you how large your tumor is. ⁴

Tinnitus deserves assessment on its own terms

Tinnitus means hearing a sound without a corresponding outside source. It may be described as ringing, buzzing, or another persistent or intermittent noise. Having tinnitus does not by itself establish a vestibular schwannoma diagnosis. Arrange assessment when it is regular, worsening, or affecting sleep, concentration, or emotional wellbeing. Tell the clinician whether it involves one ear or both; tinnitus that follows the heartbeat needs urgent assessment. Seek emergency care for tinnitus accompanied by sudden hearing loss, facial weakness, or a spinning sensation. In the United Kingdom, NHS advice is to go to A&E or call 999. A known tumor should not become an explanation for every new symptom without checking whether another problem needs attention. ³¹

Dizziness is a description, not a diagnosis

People use the word dizziness for several experiences: feeling unsteady while walking, a spinning sensation, lightheadedness, or a sense of movement when still. These distinctions matter because balance problems have many possible causes, including conditions unrelated to a tumor. The balance system combines information from the inner ears, eyes, muscles, and joints; difficulties in more than one area may contribute to a person’s symptoms. Explain what happens, how long it lasts, what brings it on, and whether you have fallen or nearly fallen. Bring a medicine list because medicines can also affect balance. Until the cause and safety implications are understood, ask a clinician about driving and activities where a sudden loss of balance could cause injury. ²³

When to seek urgent medical help

Sudden sensorineural hearing loss is a medical emergency. It can be noticed on waking or over a short period, sometimes with ear fullness, tinnitus, or dizziness. The sensation may resemble a blocked ear, but guessing the cause at home can delay time-sensitive care. Seek immediate clinical assessment and describe exactly when the change began. The clinician can examine the ear and arrange appropriate testing; a scheduled tumor-surveillance MRI is not a substitute for this assessment. Do not start leftover medication or wait to see whether a supplement improves it. Early assessment matters because delay can reduce the effectiveness of treatment for some causes of sudden hearing loss. ⁶

In the United Kingdom, NICE recommends immediate referral, with assessment within 24 hours, when unexplained hearing loss developed over three days or less within the preceding 30 days. This applies when an external-ear or middle-ear cause does not explain the loss. NICE also calls for immediate assessment of acquired one-sided hearing loss with altered sensation or facial droop on the same side, using a stroke pathway when stroke is suspected. These are referral criteria for clinicians, not a test you must complete before seeking help. If the timing is uncertain, describe what you know and seek advice rather than deciding that you fall outside a threshold. Elsewhere, use your local urgent-care or emergency service for a sudden change. ⁷

Causes and NF2-related schwannomatosis

In a sporadic vestibular schwannoma, a change in the genetic material of Schwann cells allows abnormal growth. The reason that change occurs is often unknown. This differs from identifying a genetic syndrome affecting the person and potentially their relatives. ¹⁹

A genetic condition needs a separate care discussion

NF2-related schwannomatosis, formerly called neurofibromatosis type 2, is a genetic condition that can cause tumors affecting nerves. It is different from neurofibromatosis type 1, or NF1. Hearing and balance problems may be part of the condition, but tumors can also affect nerves in the brain and spinal cord. Eye assessment and hearing tests can contribute to the investigation alongside scans and, in some cases, genetic testing. Care usually involves several specialties rather than a single visit focused only on one tumor. Because the condition requires continuing care, monitoring and support may extend well beyond the initial hearing problem. Treatment can address tumors and symptoms, but a diagnosis of NF2-related schwannomatosis is not equivalent to an isolated, one-sided vestibular schwannoma. ²⁰

Vestibular schwannomas on both sides are a characteristic feature of NF2-related schwannomatosis and warrant specialist consideration. Other nervous-system tumors can occur as part of the condition. A family history is useful, but its absence does not rule the condition out: a genetic change can arise for the first time in an individual. Some people have mosaic disease, meaning that the relevant genetic change is present in only some of their cells. That can complicate testing and discussions about inheritance. For this reason, a simple statement about every affected person having the same chance of passing the condition on would be misleading. A genetics professional can interpret the clinical findings and testing together, including what an uncertain or negative result does and does not establish. ³³

Genetic counseling provides a setting to discuss the purpose of a test, possible results, and implications for relatives or future family planning. It is an opportunity to understand those choices before deciding, rather than merely a blood-test appointment. Specialist NF2 services may coordinate hearing assessment, balance support, eye care, and psychological support alongside tumor monitoring. Psychological support can be relevant to living with uncertainty and adapting to changes in hearing or function; it is part of care rather than a replacement for medical treatment. Family discussions should be based on the confirmed findings and advice from the genetics team. An isolated symptom in a relative does not establish that they have the condition, and the assessment needed for relatives is not necessarily the same as the affected person’s follow-up. ²¹

For broader questions about navigating services and evaluating information, see our guide to finding specialist support for a rare condition.

How vestibular schwannoma is investigated

History, examination, and hearing tests

The assessment begins with the pattern of symptoms and an examination, then often includes audiology. Hearing tests can measure the quietest tones you detect and how well you understand speech; the results help describe hearing function in each ear. They do not, by themselves, prove that a tumor is present. The Congress of Neurological Surgeons recommends considering MRI screening in relevant patterns such as asymmetric hearing loss, asymmetric tinnitus, and verified sudden sensorineural hearing loss. Most people investigated for these symptoms do not turn out to have a vestibular schwannoma, so a referral for imaging is not a diagnosis. Ask what question the scan is intended to answer and how the hearing-test findings contributed to the decision to investigate. ⁸

What MRI can show

MRI is the preferred imaging test for identifying a vestibular schwannoma and showing its position. It can detect small tumors that would be difficult to establish from symptoms or hearing tests alone. A CT scan can be useful when MRI cannot be performed, but small tumors may be missed. The limitation matters when interpreting a reassuring result: different tests do not offer identical information about the nerves and surrounding tissues. The imaging choice is therefore made in relation to the diagnostic question and the person’s circumstances. ¹⁰

MRI can show whether a lesion is confined to the internal auditory canal, the narrow bony passage carrying the nerve, or extends into the space beside the brainstem. Imaging also helps distinguish a schwannoma from other masses or cysts in that region. This anatomical information helps explain why similar symptoms can lead to different management plans. ¹¹

Before an MRI, tell the radiology team about implanted devices, previous operations, metal in the body, pregnancy, and relevant medical conditions. A device name or implant card can help staff check compatibility; do not decide for yourself that an implant makes scanning either safe or impossible. Mention previous reactions to contrast and any concerns about an enclosed scanner. If claustrophobia is likely to make the examination difficult, raise it before the appointment so the service can discuss suitable arrangements. MRI is noisy, and hearing protection is normally provided. Follow the team’s preparation instructions and ask how you can communicate with staff during the scan. The imaging service, rather than a general information article, determines the precautions needed for your particular examination. ³⁰

An MRI does not always require injected contrast. The 2025 CNS imaging guidance recognizes roles for both contrast-enhanced imaging and selected high-resolution noncontrast sequences. The protocol depends on whether the task is initial diagnosis, surveillance, or assessment after treatment. Follow-up timing also depends on the individual situation; an interval used by one hospital should not be treated as a universal rule. Scans obtained before treatment and afterward answer different questions. During observation, the team looks for growth; after an operation, it may assess remaining tissue; after radiation, it considers the pattern of response. Serial changes and symptoms can be more informative than a single measurement, particularly when temporary enlargement follows radiation. The written plan should specify the intended test and how the result will be communicated. ⁹

Choosing a management plan

Management may involve observation, radiation treatment, or surgery. The clinical presentation, tumor size and anatomy, hearing, overall health, and available expertise all contribute to the choice. MRI appearances often allow a working diagnosis without an initial biopsy. When a large tumor is compressing important structures, relieving that pressure may become a central treatment goal, and surgery is generally the principal way to achieve decompression. That situation is different from considering options for a small tumor discovered during investigation of mild symptoms. Ask the team which finding is driving its recommendation. A size measurement is useful, but it should be explained alongside the symptoms, examination, and relationship to nearby structures rather than used as an automatic treatment formula. ¹¹

Separate three questions during the consultation: what needs to happen to the tumor, what function the team hopes to protect, and what help you need with symptoms now. Explain your main priority, whether it is understanding a scan change, communicating at work, or walking confidently. If specialists suggest different approaches, ask whether they are weighing different goals or findings. The explanation should make their reasoning understandable without requiring you to choose an operation or radiation technique on your own.

Observation and active surveillance

Observation is a planned management strategy for selected patients, not an instruction to forget about the diagnosis. It usually combines repeat imaging with hearing assessment and review of symptoms. The aim is to learn whether the tumor or its effects are changing enough to alter the balance between monitoring and intervention. Your preferences matter alongside the clinical findings. Some people are comfortable with monitoring, while others find the uncertainty difficult and want a fuller discussion of the alternatives. Ask what the team expects to learn from the next review and which changes would lead it to reconsider treatment. Observation, radiation, and surgery pursue different immediate goals: following behavior, controlling growth, or removing tissue. Understanding that distinction makes the options easier to compare. ¹²

An agreed surveillance plan should make clear when the next scan is expected, who will receive it, and how you will hear the result. If imaging is performed at another hospital, check that the specialist team can obtain the actual images for comparison. A change in symptoms is a reason to contact the team between scheduled reviews. If growth is detected, the next step is a renewed clinical discussion; its significance depends on the pattern and the structures involved. After radiation, temporary enlargement can occur, so a larger measurement does not automatically mean treatment has failed. Keep the contact details and follow-up instructions somewhere accessible, and ask what to do if an expected appointment or result does not arrive. ¹⁹

Stereotactic radiosurgery and radiotherapy

Stereotactic radiosurgery uses precisely targeted radiation rather than an incision to treat a selected lesion. Planning involves imaging and specialist review to assess suitability and limit exposure of surrounding structures. Depending on the treatment plan, radiation may be delivered in a single session or divided across sessions. The word stereotactic refers to accurate localization of the treatment target; despite the term surgery, this is a radiation procedure. Its intended effect develops over weeks or months, so the tumor is not physically removed during the appointment. Subsequent imaging assesses how it responds. The team continues to review progress after the radiation has been delivered, because completing the treatment session and establishing durable tumor control are different milestones. ¹⁶

Radiation is intended to control tumor growth, but tumor control and hearing preservation are different outcomes. In its 2025 update, CNS advises against presenting radiosurgery as superior to observation alone for hearing preservation in adults with small sporadic tumors, including tumors confined to the internal auditory canal or measuring less than two centimeters. That recommendation does not mean radiation has no role; it means hearing benefit should not be promised as the reason to choose it. Planning considers exposure of hearing-related structures, and potential effects on hearing and nearby nerves belong in the consent discussion. Ask about the expected benefit, short-term effects, longer-term uncertainties, and how additional treatment would be considered if control is inadequate. Findings for sporadic tumors should not simply be transferred to NF2-related disease. ¹⁵

Surgery: removal and protection of function

Why the surgical approach differs between people

The main surgical routes are called retrosigmoid, middle fossa, and translabyrinthine approaches. These names describe how the surgeon reaches the tumor; they do not identify a universally best operation. The hearing present before surgery, the tumor’s features, and the goals of the procedure influence the choice. Hearing-preservation surgery through a middle fossa or retrosigmoid approach may be considered in selected patients with good preoperative hearing. An attempt at preservation does not guarantee retained hearing. The 2025 CNS surgical guidance does not establish one approach as superior for every patient’s facial-nerve outcome and complete tumor removal. Evidence gaps are important here: an approach can be appropriate in an individual case without having been proved best for everyone with the diagnosis. ¹³

The translabyrinthine route passes through the inner ear and sacrifices remaining hearing on that side. It is generally considered when functional hearing is already absent. A retrosigmoid route reaches the area from behind the head while preserving inner-ear structures, although that does not ensure that hearing will survive the operation. ¹⁷

What nerve monitoring can and cannot do

During surgery, the team may monitor electrical signals associated with facial-nerve function and, where appropriate, hearing. Facial monitoring and auditory monitoring assess different pathways. Changes in these signals provide information while the surgeon works near delicate structures and can help guide decisions intended to preserve function. Monitoring does not make nerve injury impossible, and a recorded signal is not a guarantee of the final outcome. The value and feasibility of particular techniques depend on the circumstances, including hearing before surgery and the tumor’s relationship to the nerves. The CNS guidance supports monitoring while recognizing limitations in the evidence. Some auditory monitoring techniques are harder to use when a tumor obscures access to the nerve, so the method is selected for the operation rather than applied identically in every case. ¹⁴

Risks and the possibility of leaving a remnant

Potential complications include loss of hearing, facial weakness, balance difficulties, and leakage of cerebrospinal fluid. Hearing loss may be permanent even when the tumor has been removed successfully. Facial-nerve injury can affect expression and eye closure; recovery varies, and some people need continuing facial rehabilitation or reconstructive treatment. Cerebrospinal-fluid leakage occurs when the protective covering around the brain does not seal completely and may need another procedure. These functional outcomes are distinct from the amount of tumor removed. The risk profile also depends on the tumor and the person’s health, so a single overall success percentage can obscure important differences. Assessment by a specialist team brings the goals of tumor treatment, nerve protection, and rehabilitation into the same discussion. ¹⁷

Sometimes a small amount of tumor is deliberately left behind because removing it would create an unacceptable risk to a nerve or the brainstem. A planned remnant is therefore not automatically evidence that an operation went wrong; it creates a need to explain the subsequent monitoring or treatment plan. Recovery also varies. Fatigue, balance difficulties, and facial changes can require ongoing support after discharge. If facial weakness prevents the eye from closing normally, or sensation is reduced, protecting the eye becomes an important part of care. Follow the specific instructions from the surgical and eye teams rather than choosing drops or taping methods without guidance. Ask for a written recovery plan covering help at home, activity, rehabilitation, warning signs, and the contact route for concerns. ²⁸

What the evidence means for hearing

Useful hearing may decline during observation and after either surgery or radiation. The starting level of hearing, tumor characteristics, and length of follow-up affect the outlook. The 2025 CNS hearing-preservation update brings together results from different patient cohorts; its percentages are not a randomized comparison of three interchangeable choices. Many recommendations use lower-certainty evidence, and the underlying research search ends in 2022. An updated guideline does not remove every uncertainty. Ask for a discussion that matches your current hearing and proposed management rather than a single average percentage. It is important to distinguish retaining hearing that is present now from restoring hearing that has already been lost. These are different goals and should not be promised together. ¹⁸

Rehabilitation and everyday function

Balance therapy should follow assessment

Vestibular rehabilitation is physical therapy tailored to a person’s balance and dizziness problems. Assessment can guide work on gaze stability, balance, walking, and tolerance of movement. Gaze-stability work addresses keeping vision steady during movement; balance retraining helps coordinate the systems used to remain upright. Therapy may combine supervised sessions with an individualized home program. The exercises and their progression depend on the difficulties identified, so a routine found online may not address the same problem. New or unexplained dizziness should be medically assessed before it is treated as a rehabilitation issue. Falls, visual blurring, motion sensitivity, and mobility limitations are relevant to that assessment. Rehabilitation aims to improve function and adaptation; it is not a way to remove the tumor or replace needed medical investigation. ²²

Understanding hearing on one side

When one ear has very little useful hearing, listening can be difficult even if the other ear hears well. Locating the direction of a sound and following speech in background noise can be particularly challenging. Sounds coming from the poorer-hearing side can be harder to access, and turning toward a speaker may become a frequent adjustment. A CROS system places a microphone on that side and sends sound to the better-hearing ear. It can make speech or other sounds from that side more accessible, but it does not recreate ordinary processing with two hearing ears. This distinction explains why a device may help with one listening situation while leaving difficulties with localization or noisy groups. Hearing support is assessed against those real-world limitations, not only whether sound is audible. ²⁵

A conventional hearing aid may help when there is usable hearing in the affected ear, but it does not restore normal hearing. A microphone picks up sound, an amplifier increases its strength, and a speaker delivers it to the ear. Amplification has limits: it cannot reliably overcome damage that prevents sound from being converted into useful nerve signals. Device selection therefore depends on the pattern and severity of hearing loss as well as communication needs. Fitting and follow-up adjustments address comfort, volume, feedback, and listening in different settings. An aid does not perfectly separate a desired voice from background noise. Learning its controls and maintaining it are part of using it effectively. New one-sided or sudden hearing loss still needs diagnostic assessment rather than simply purchasing amplification. ³²

Implants require specialist selection

A cochlear implant uses electrical stimulation of the auditory nerve to provide access to sound. A microphone and sound processor collect and organize sound information, which is passed to an implanted receiver and electrodes. The system bypasses damaged parts of the inner ear instead of simply making incoming sounds louder. Signals still have to travel through the auditory nerve and be interpreted by the brain. This is why an implant differs from a hearing aid and does not reproduce normal hearing. Programming and rehabilitation are important parts of treatment, because learning to interpret the signals takes time and results vary. Some people gain substantial access to speech and environmental sounds, while performance differs between individuals. Specialist assessment must establish whether the device is appropriate before the operation is considered. ²⁶

Bone-conduction devices, CROS systems, cochlear implants, and auditory brainstem implants serve different purposes. They should not be treated as interchangeable versions of the same treatment. Bone-conduction devices transmit vibrations through bone to the inner ear. CROS systems route sound from the poorer-hearing side to the better-hearing ear. Cochlear implants provide electrical signals to a functioning auditory nerve, whereas an auditory brainstem implant may be considered for selected people whose hearing nerves cannot carry the required signals. A brainstem implant bypasses that nerve pathway and delivers electrical signals at the brainstem. These anatomical differences are especially important when a tumor or its treatment has affected the hearing nerve. The appropriate option depends on the remaining hearing pathway, the hearing in the other ear, and specialist assessment. ²⁷

Reducing the impact of tinnitus

Tinnitus care focuses on reducing its effect on daily life. Sound-based approaches may make the tinnitus less intrusive, and behavioral therapies can help with the distress and attention patterns that accompany it. Hearing support may also be relevant when hearing loss is present. These strategies do not imply that the sound is imagined or that the tumor has disappeared; they address how the symptom affects sleep, concentration, and wellbeing. Explain which part is most disruptive so treatment can be directed toward a meaningful goal. Vitamins, herbal products, and supplements advertised as tinnitus cures have not been shown to cure it. Discuss products you are considering with a healthcare professional rather than adding them to an already complicated treatment plan without checking. ²⁴

Practical support at home and work

Small changes to conversations can make hearing difficulties easier to manage. Ask people to face you, get your attention before speaking, and reduce background noise where possible. A quieter setting and good lighting can make it easier to follow a speaker. If you miss something, ask for rephrasing rather than feeling obliged to guess. Explain which side is easier to hear from and choose seating accordingly. These adjustments can be useful during medical appointments as well as at home or work. Tell a service in advance if telephone calls are difficult and ask what accessible communication options it offers. New or rapidly worsening hearing still needs medical attention; practical listening changes are support measures, not a reason to defer assessment. ⁵

Assistive technology can help with tasks that a hearing aid alone may not solve. Options include systems that bring a speaker’s voice more directly to the listener, captioning for speech or media, and visual or vibrating alerts. Think about the situations that matter in your day: hearing an alarm, following a video meeting, receiving a door signal, or understanding a clinician. Ask an audiologist or accessibility service which type of support matches that task and whether it works with devices you already use. Check how an alert will reach you in the room where you need it, rather than assuming that a product’s presence makes it effective. The goal is dependable access to information and safety signals, not accumulating equipment without a clear purpose. ²⁹

Prepare a short record of changes since the last review: when hearing changed, which situations affect balance, any falls, and the effect of tinnitus on sleep. Keep copies of scan reports and audiograms, and check whether the team needs original images transferred. Put your most important questions first and take a support person if you want help remembering the discussion. Before leaving, repeat your understanding of the plan and clarify who will arrange each next step.

Follow-up remains part of care

Follow-up can remain necessary after treatment because symptoms may persist and the team may need to check for remaining or returning tumor. The word successful should therefore be unpacked: a good result on imaging does not necessarily mean that hearing, tinnitus, or balance has returned to its previous state. Ask what continuing review is intended to monitor and who will address unresolved symptoms. ³

Keep a written plan recording the next imaging review, any hearing assessment, and who will explain the results together. If care moves between hospitals, check how records will follow you. Include rehabilitation and symptom support rather than only the scan date. During recovery, discuss the demands of work, travel, and daily responsibilities before making commitments. Another patient’s timetable is not an instruction for your recovery. You should know the next step and how to raise a concern before then.

Frequently asked questions

Does every vestibular schwannoma need immediate treatment?

No. Selected tumors can be monitored with planned imaging, hearing assessment, and symptom review. The choice depends on individual findings. ¹²

Can hearing worsen when the MRI looks stable?

Yes. Hearing can deteriorate without measurable tumor growth, so report hearing changes even when the latest scan is stable. ⁴

Does stereotactic radiosurgery remove the tumor?

No. It delivers targeted radiation; the tumor remains in place while follow-up assesses the response over time. ¹⁶

Will treatment restore hearing that has been lost?

Hearing preservation and restoration are different goals. Surgery or radiation should not be assumed to restore hearing already lost. ¹⁸

Can natural remedies shrink a vestibular schwannoma?

No natural remedy has been shown to shrink or cure this tumor. Discuss symptom support and treatment options with your team. ¹⁰

The original article’s video, “Vestibular schwannomas: Mayo Clinic Radio,” is retained below as background. It has not been independently reviewed in full for this update; treatment details may differ from current guidance. Use your specialist’s advice for decisions about your care.