What is unilateral hearing loss?: The causes, symptoms, treatments, and advice

What is Unilateral Hearing Loss?

The causes, symptoms, what can help, and advice on how to live with it

Overview    |    What is it?    |    Symptoms    |    Causes    |    What can help    |    Living with it    |    Conclusion

Last Hearing Aid UK Update:  15/10/2026

Hearing loss in one ear

Unilateral hearing loss is when one ear is affected while the other hears normally. It can develop at any age and stem from a range of causes, including infections, injury, a non-cancerous growth on the hearing nerve, genetics, or ageing. 

Unlike age-related hearing loss, which usually affects both ears, hearing loss in one ear normally has a specific cause, so it’s always worth getting checked.

Those affected often struggle to locate sounds or follow conversation in noisy settings. It's the kind of thing you might first notice in a busy cafe, barely catching a word on one side, but turning your head and suddenly hearing fine. These small clues are often worth taking seriously.

What helps will depend on the cause, but options include hearing aids, CROS and bone conduction hearing aids, and auditory rehabilitation, which uses listening exercises and practical support to help you make the most of your hearing.

As with most hearing difficulties, the sooner it’s picked up, the sooner the right support can be put in place. In this article, we look at the main symptoms, causes and options, and how to live well with unilateral hearing loss.

What is unilateral hearing loss?

Unilateral hearing loss means reduced hearing in one ear, from mild to profound. Single-sided deafness (SSD) is the term used when that loss is severe to profound.

Hearing loss in one ear can be frustrating, but it isn’t always permanent, and support is available. Always see your GP first, and urgently if the change is sudden, so any medical causes can be checked.

It can be disorientating when you can’t tell which direction a car is coming from, or you misjudge where your phone is ringing. Everyday moments like these can make unilateral hearing loss particularly noticeable and inconvenient.

One of the trickiest parts of hearing loss in one ear is something called the “head shadow effect”. When someone speaks on your weaker side, their voice has to travel around your head to reach your good ear.

Your head blocks some of that sound along the way, especially the higher-pitched parts of speech, so voices on that side can sound muffled or faint, and noisy places make it even harder. This is why people with unilateral hearing loss instinctively position themselves to keep their good ear facing the action.

Symptoms of unilateral hearing loss

Often, the first clues are habits you don’t notice you’ve picked up: always sitting so your “good ear” faces your friends, tilting your head towards whoever’s speaking, or turning the TV up when everyone else says it’s fine. Other common signs include:

• Struggling to hear in busy, noisy places
• Finding it hard to tell where a sound is coming from, like a phone ringing in another room
• Missing what people say on your weaker side
• Speech sounding muffled or unclear
• Feeling less aware of your surroundings, for example when crossing the road
• If any of these sound familiar, it’s worth getting your hearing checked.

Causes of unilateral hearing loss

Hearing loss in one ear can happen for lots of reasons, and some are easier to resolve than others. Common causes include:

• Ear blockage: Often from a build-up of earwax, which can usually be cleared
• Ear infections: Viral or bacterial infections can affect hearing, often temporarily
• Perforated eardrum: A small tear in the eardrum, which often heals on its own
• Head injury: A knock to the head can damage the ear or the hearing nerve
• Inner ear conditions: Such as Ménière’s disease or labyrinthitis, which can also cause dizziness or ringing in the ear
• Acoustic neuroma: A rare, non-cancerous growth on the nerve between the ear and the brain
• Inherited conditions: Occasionally, genetic factors can affect one ear more than the other

Some people notice symptoms after flying or swimming, or wake up with a sudden feeling of pressure or ringing in one ear. If your hearing changes suddenly, the NHS advises getting an urgent GP appointment or contacting NHS 111.

Is unilateral hearing loss permanent?

Depending on the cause, severe or profound hearing loss in one ear can be permanent. Even so, there are still ways to make everyday listening easier, which we’ll look at below. 

If the cause is earwax, an infection or a perforated eardrum, hearing often improves once the cause is dealt with. If the inner ear or hearing nerve has been damaged, the hearing loss is more likely to be permanent.

The key is not to wait it out; many people assume it’ll clear on its own, but some causes, such as sudden hearing loss, need checking quickly, so seeing your GP promptly is always best.

What can help with unilateral hearing loss?

What helps depends on the cause. Some causes can often be resolved, and your GP, or an ear, nose and throat (ENT) specialist if you’re referred, may suggest:

• Antibiotics for bacterial infections
• Steroids to reduce swelling and inflammation
• Surgery to repair damage
• Clearing blockages, such as earwax removal

Where hearing loss is permanent, hearing aids, CROS systems or, through the NHS, bone conduction implants can help.

Bone conduction hearing aids, which transfer sound through the skull to the better-hearing ear, can help people with SSD, for example when trying to hear passengers in the car. Surgically fitted bone conduction devices are usually arranged through specialist NHS services, not through Hearing Aid UK.

Can hearing aids help unilateral hearing loss?

 If you have unilateral hearing loss and struggle to hear conversations amid background noise, a hearing aid can help amplify the sounds you're missing. 

For current hearing aid wearers, assistive devices like remote microphones can help in noisy environments, as they send speech directly to the hearing aids.

Bluetooth streaming of phone calls and music can also make busy places, like packed trains, easier to manage. Traditional hearing aids can help if you have enough usable hearing in the affected ear, but they won't help with profound single-sided deafness. This is where CROS and BiCROS systems come in.

CROS stands for Contralateral Routing of Signal. A small microphone worn on your deaf ear picks up sounds and wirelessly transmits them to a hearing aid on your better-hearing ear.

This helps overcome the head shadow effect and allows you to hear conversations and sounds from your "bad side" without constantly repositioning yourself. It won’t restore your sense of where sounds are coming from, but it can make conversations on that side much easier to follow. BiCROS works the same way for people who also have some hearing loss in their better ear.

“With single-sided deafness, people often tell me they’ve spent years choosing seats and turning their head without really noticing. The first thing we’d always want is for your GP to rule out any medical cause.

After that, if the hearing in that ear can’t be brought back, a CROS hearing aid can be a simple, practical option, because it brings the sound from your deaf side round to your good ear. It won’t give you back stereo hearing, but it can stop you missing half the conversation.”

says Paul Harrison, Audiology Expert & Founder, Hearing Aid UK

Living with unilateral hearing loss

How much unilateral hearing loss affects daily life really depends on its severity. The good news is that small, practical changes can go a long way. Being upfront with people about your hearing, asking them to face you when they speak and directing their voice to your hearing side, removes a lot of unnecessary guesswork.

During conversations, reducing background noise where you can helps significantly, and thinking about where you sit in social settings (your stronger ear towards the group at dinner, for example) is a simple habit worth getting into.

On video calls, streaming directly to a hearing device or using headphones can make a noticeable difference to clarity. At work, a quiet word with your employer about small adjustments, a different desk, a better headset, can improve both comfort and focus without much fuss.

Connecting with a support group, whether online or in person, is also worth considering; hearing from others in the same situation can be genuinely reassuring and full of practical insight.

Conclusion

Unilateral hearing loss is more manageable than many people expect, but it does need attention. Struggling to hear in noisy environments or finding it hard to work out where sounds are coming from can quietly take its toll on daily life. Causes vary widely, from something as straightforward as a blockage to an infection or something more complex underneath.

There's a lot that can be done. Options range from hearing aids to surgery, and in the meantime, small changes, such as cutting down background noise, communicating your needs to those around you, and getting the right support, can make a real difference day to day.

It's easy to write off one-sided hearing loss as something that'll sort itself out, or convince yourself it's not serious enough to act on. But the sooner you get it checked, the more doors are open to you. If something doesn't feel right, your GP is the best first step; they can refer you to an audiologist if needed.

How Hearing Aid UK can help

Once your GP has ruled out any medical cause, a free hearing test will show how much hearing you have in each ear and what could help. Hearing Aid UK connects you with over 200 independent, HCPC-registered audiologists across 93+ clinics, and you can have your test at a local hearing clinic or through a free home visit.

If a hearing aid or CROS system could help, your audiologist will fit and fine-tune it in person, with aftercare for life and a 60-day money-back guarantee, so you can try it in everyday life before deciding. We’re also Which? recommended.

Call us free on 0800 567 7621 to book your free hearing test.