What an Acoustic Neuroma Is

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An acoustic neuroma is a growth on the nerve that connects the inner ear to the brain — the nerve responsible for hearing and balance. Its more precise medical name is a vestibular schwannoma, because it grows from the Schwann cells that wrap around that nerve.

It is benign and slow-growing, and it does not spread to other parts of the body. The reason it matters is location, not aggression: it sits in a tight space near the brainstem and the facial nerve, so as it grows it can press on things that matter. That's why it's watched and, when needed, treated.

The Symptoms to Know

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Because it grows on the hearing and balance nerve, the symptoms follow naturally. They usually come on gradually, on one side, and that one-sidedness is an important clue.

• Hearing loss in one ear — the most common sign, usually gradual rather than sudden.
• Ringing in that ear (tinnitus), often in the same ear as the hearing loss.
• Balance problems or dizziness, as the balance side of the nerve is affected.
• Facial numbness or weakness, in larger tumours pressing on the nearby facial nerve.

One-sided hearing loss or ringing is the symptom that most often leads to diagnosis. It's worth taking seriously and getting checked — usually with a hearing test and an MRI — rather than putting it down to age or wax.

Why Monitoring Is Often an Option

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Here's something that surprises people: doing nothing, for now, can be exactly the right choice. Because these tumours grow so slowly — and some barely grow at all — small ones causing few symptoms are often simply watched.

This is called watchful waiting, and it means regular MRI scans to track whether the tumour is growing. If it stays stable, no treatment is needed, and you avoid any risk that treatment itself carries. This is often the sensible path for older patients, or for very small tumours found by chance.

If the scans show the tumour is growing, or symptoms worsen, that's the point to move to active treatment. Monitoring isn't ignoring the problem — it's making sure treatment happens only when it will genuinely help.

The Three Treatment Options

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When an acoustic neuroma does need treating, there are three routes. Which one fits depends mainly on the tumour's size, whether it's growing, your age and your hearing.

Radiosurgery doesn't remove the tumour — it stops it growing, and the effect builds over time. It's a strong option for smaller tumours and for anyone who can't or would rather not have an operation; how it works is set out in the guide on CyberKnife and Gamma Knife radiosurgery in India.

Surgery physically removes the tumour and is usually the choice for larger ones, or those pressing on the brainstem. It's delicate skull-base work, so it calls for an experienced surgeon — which is the focus of the guide to the best neurosurgeon in India. Where an acoustic neuroma sits among other brain tumours is explained in the guide on brain tumour types and grades.

Protecting Hearing and the Facial Nerve

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Two things sit at the heart of every acoustic neuroma decision: your hearing, and the facial nerve that runs right alongside the tumour. Treatment is always planned with both in mind.

The facial nerve controls the movement of your face, and because it lies so close, protecting it is a central goal — the team works to preserve facial function. With hearing, the aim is to preserve whatever useful hearing remains where possible, though this depends a great deal on the tumour's size and where it sits.

This is exactly why the size and timing matter so much, and why smaller tumours often have more options. It's also why an experienced team is so important: the difference between a good and a poor outcome here often comes down to skill and judgement around these delicate nerves.

Frequently Asked Questions

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What is an acoustic neuroma?

An acoustic neuroma, also called a vestibular schwannoma, is a benign, slow-growing tumour on the nerve that carries hearing and balance from the inner ear to the brain. It does not spread to other parts of the body. It matters because of its location near the brainstem and facial nerve, not because it is aggressive, so it is watched and treated based on its size and growth.

What are the symptoms?

The most common symptom is gradual hearing loss in one ear, often with ringing (tinnitus) in the same ear. Balance problems or dizziness can occur as the balance part of the nerve is affected, and larger tumours can cause facial numbness or weakness. One-sided hearing loss or ringing is the symptom that most often leads to diagnosis and is worth getting checked with a hearing test and MRI.

Does it always need treatment?

No. Because these tumours grow so slowly, small ones causing few symptoms are often simply monitored with regular MRI scans. If the tumour stays stable, no treatment is needed and you avoid any risk treatment carries. This watchful waiting is often right for older patients or very small tumours; active treatment begins if the tumour grows or symptoms worsen.

Surgery or radiosurgery?

It depends mainly on size. Stereotactic radiosurgery, such as Gamma Knife or CyberKnife, uses focused radiation to stop a small-to-medium tumour growing, with no incision, and suits those avoiding surgery. Microsurgical removal physically takes out the tumour and is usually chosen for larger or growing ones, or those pressing on the brainstem. Your age, hearing and the tumour's position all feed into the decision.

Will I lose my hearing?

Not necessarily. The aim of treatment is to preserve whatever useful hearing remains where possible, though this depends heavily on the tumour's size and position and on how much hearing is already affected. Smaller tumours generally offer more chance of preserving hearing. The facial nerve is protected with equal care, since it runs right alongside the tumour, which is why an experienced team matters so much.

Is an acoustic neuroma cancer?

No. An acoustic neuroma is benign — not cancer — and does not spread to other parts of the body. It grows slowly, and many never need active treatment. Even though it is benign, it is taken seriously because of its position near the hearing and balance nerve, the facial nerve and the brainstem.