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Understanding Noise-Induced Hearing Loss (NIHL)
What is noise-induced hearing loss, and can it cause permanent damage?
Introduction | The physiology | Causes | Symptoms | How it's checked | Management and prevention | What can help? | Living with noise-induced hearing loss | Conclusion
Last Hearing Aid UK Update: 16
Overview
Noise-induced hearing loss is caused by loud sound damaging the tiny hair cells deep inside your ear. The good news is that, unlike many types of hearing loss, it’s largely preventable. It can creep up over years of loud music or machinery, or happen in an instant from a single very loud bang.
The signs often show up first as difficulty following speech or hearing higher-pitched sounds clearly - things that are easy to dismiss at first, which is part of why it so often goes unaddressed.
In this article, we look at what causes noise-induced hearing loss, how it affects your hearing, and, most importantly, what you can do to protect yourself before any damage is done, as well as how to manage it if it's already affecting you.
What is noise-induced hearing loss?
Noise-induced hearing loss (NIHL) happens when loud sound damages the tiny hair cells in your cochlea, the part of the inner ear that turns sound into signals for your brain. It’s one of the most common types of hearing loss.
You might recognise the feeling: you leave a gig with your ears ringing, and the next day conversations sound a little muffled. Most people shrug it off, and often it does settle. But if it keeps happening, that temporary ringing can turn into permanent damage.
Whether it’s a roaring crowd or the constant grind of machinery on a building site, loud noise puts your hearing under strain, and the longer you’re around it, the more harm it can do.
The problem lies with the tiny hair cells inside the inner ear. Once these get overstimulated by loud sound, they can be damaged beyond repair, and unlike most cells in the body, they don't grow back. Every bout of excessive noise chips away at them a little more, gradually narrowing what you can hear.
It doesn't have to be dramatic, either. Something as everyday as listening to music through headphones at high volume, something millions of people do without a second thought, can quietly wear away the cells responsible for picking out certain frequencies, making it harder to hear clearly over time.
The physiology of hearing and noise-induced hearing loss
It helps to understand what's actually happening inside your ear before we get into what can go wrong. Sound enters through the ear canal and gets the eardrum moving. From there, the vibration travels through three tiny bones in the middle ear, some of the smallest in the entire human body, before reaching the cochlea in the inner ear.
Inside, microscopic hair cells do the remarkable job of turning those vibrations into electrical signals that your brain recognises as sound. When loud noise enters the picture, those hair cells take the hit. Too much exposure, whether it builds up over years or happens in a single moment, can damage them beyond the point of recovery.
And that's the crucial thing: once damaged beyond repair, hair cells don't heal, they don't regenerate, and nothing currently available can bring them back. The hearing loss they cause is permanent, which is why the choices you make around noise exposure now really do matter in the long run.
Causes of noise-induced hearing loss
Most noise-induced hearing loss comes from being around loud noise for long periods. That ringing after a gig or festival is often temporary, but if it happens again and again, the damage can become permanent.
It can happen almost anywhere: a factory floor with machinery running all day, standing close to the speakers at a concert, or even listening through headphones with the volume turned up. And it’s not only long-term exposure that matters. A sudden, very loud noise, like an explosion or gunshot, can damage the delicate structures in your ear straight away.
Is it permanent?
Noise-induced hearing loss can be temporary or permanent. Temporary hearing loss usually recovers after a few hours or days, while permanent hearing loss results from sustained damage to the hair cells, which do not regenerate.
If you’ve ever stepped out of a loud event and found that your hearing felt muffled, that’s often temporary NIHL. However, repeated instances of this can accumulate over time and cause permanent damage.
If your hearing changes suddenly, or ringing and muffled hearing don’t settle within a day or two, the NHS advises asking for an urgent GP appointment or contacting NHS 111.
Symptoms and Diagnosis of Noise-Induced Hearing Loss
How is noise-induced hearing loss diagnosed?
What are the signs of noise-induced hearing loss?
One of the first signs of NIHL is often tinnitus, a ringing in your ears. You might also find it harder to follow conversations, especially when there’s background noise, or notice that sounds seem muffled and less sharp than they used to.
Say you’re at a party or in the pub, and your friends are talking normally, but you can’t quite pick out what they’re saying. That could be an early warning sign. Catching it early, and protecting your ears from further loud noise, can help stop it from getting worse.
Can an audiologist check for noise-induced hearing loss?
Yes, and it’s a straightforward process. An audiologist will play a range of tones and words to find out what you can and can’t hear clearly. Noise damage often shows up as a dip in the higher pitches, so the results can give a clear picture of what’s going on.
Noise management and how to protect your hearing
The simplest way to protect your hearing is to cut down on how much loud noise you’re exposed to. A few easy habits can help:
- Take breaks from noisy environments.
- Use noise-cancelling headphones.
- Keep your music volume levels low, especially when using headphones, and don’t ignore your phone if it gives you a warning that the volume is too high!
Quick prevention tips:
- Earplugs: Disposable or reusable earplugs can make a big difference to how much noise reaches your ears. If you work somewhere loud, custom-moulded earplugs are worth considering, because they’re shaped to your ears, fit more snugly and block noise more consistently.
- Ear defenders: These sit over your ears like headphones. You can wear them on their own, or with earplugs underneath for extra protection in very noisy places.
Are you at risk of noise-induced hearing loss in the workplace?
Noise at work is one of the most common causes of hearing loss, which is why there are clear legal rules in place to protect you. Some jobs carry a higher risk than others, especially if you’re around loud noise day in, day out, such as construction, factory work or playing music.
If I work in a noisy environment, does my employer need to supply ear protection?
Yes. If your job is noisy, the Control of Noise at Work Regulations 2005 mean your employer has a legal duty to protect your hearing, and that includes making sure you have the right hearing protection.
- According to HSE, if your average daily or weekly exposure reaches 80 dB(A), your employer must assess the risk and give you information and training. At 85 dB(A), they must provide hearing protection and set up hearing protection zones.
You must not be exposed above 87 dB(A), taking any hearing protection into account.
- In noisy environments like construction or manufacturing, a useful rule of thumb is that if you need to raise your voice to talk to someone about two metres away, the noise may be loud enough to put your hearing at risk.
- If you use headsets or headphones at work, the same noise rules apply, and your employer should assess the risk.
Noise-Induced Hearing Loss Treatment and Symptom Management
What should I do if I am diagnosed with noise-induced hearing loss?
While no cure exists for permanent NIHL, hearing aids can help manage the condition
If you think you have noise-induced hearing loss or are showing the symptoms, an audiologist can test your hearing and explain the type and degree of hearing loss you have. They will also recommend hearing aids that suit your hearing, lifestyle and needs.
As well as using hearing aids, there are small, easy, daily adjustments you can make. Follow our tips below to aid communication and improve quality of life.
Tips for living with NIHL
If your hearing test shows noise-induced hearing loss, hearing aids are often the first step. Hearing aids can amplify sounds, filter background noise, and make conversations easier to follow.
If you have lost certain frequencies due to noise and have low-frequency hearing loss or high-frequency hearing loss, the hearing aids can be programmed to suit your personal hearing needs and boost the frequencies you’re missing. Other tips include:
- Face the person you're speaking with.
- Reduce background noise where possible; for example, if you are struggling to hear at work, request a designated quiet space for one-to-one meetings.
- Use visual cues to improve communication.
- Assistive listening devices, such as those for your TV and smartphone apps, can also improve your quality of life by giving you more control over your hearing.
Imagine sitting down to a family dinner and being able to follow the conversation without straining, even when your grandkids are giggling and playing in the background. That’s the difference hearing aids can make. You can download a guide about noise-induced hearing loss from The London School of Hygiene and Tropical Medicine.
How Hearing Aid UK can help
If you’ve noticed ringing, muffled hearing or difficulty following conversations, a free hearing test is a simple place to start. 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 hearing aids could help, your audiologist will fit and fine-tune them in person, with aftercare for life and a 60-day money-back guarantee. We’re also Which? recommended. Call us free on 0800 567 7621 to book your free hearing test.
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Noise-Induced Hearing Loss Conclusion
The most important thing to know about noise-induced hearing loss is that it’s largely preventable.
Turning the volume down, taking breaks from loud places and wearing hearing protection at work or at gigs can all help protect the hearing you have.
If you’re already noticing ringing, muffled sounds or trouble following conversations, don’t wait.
Getting your hearing checked early means you’ll know where you stand and what can help.
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Common FAQs about hearing aids and hearing loss
In general, any audiologist will always recommend to you the hearing aid model that best suits your needs. Here is a useful checklist to make sure that is the case.
- Audiologist's level of knowledge: The audiologist you have seen will hopefully have a wide knowledge of all available hearing aids; however, some will only be familiar with a small number of brands and, therefore, may not really be in a position to know which model is the best for you. It is OK to challenge their recommendation and ask them to justify why this particular brand is the one for you.
- Do research: Read about the hearing aid that was recommended. Does it seem like it will suit your lifestyle? Does it have more or fewer features than you need?
- Be aware of sales targets: Many high street retailers have specific tie-ins to a particular manufacturer/brand. The hearing aid they have suggested may still be the correct one for you, but do your research so that you know why they might have recommended it. You can read our best hearing aids of this year here
If you have significant hearing loss in both ears, you should be wearing two hearing aids. Here are the audiological reasons why:
Localisation: The brain decodes information from both ears and compares and contrasts them. By analysing the minuscule time delays as well as the difference in the loudness of each sound reaching the ears, the person is able to accurately locate a sound source.
Simply put, if you have better hearing on one side than the other, you can't accurately tell what direction sounds are coming from.
Less amplification is required: A phenomenon known as “binaural summation” means that the hearing aids can be set at a lower and more natural volume setting than if you wore only one hearing aid.
Head shadow effect: High frequencies, the part of your hearing that gives clarity and meaning to speech sounds, cannot bend around your head. Only low frequencies can. Therefore, if someone is talking on your unaided side, you are likely to hear that they are speaking, but be unable to tell what they have said.
Noise reduction: The brain has its own built-in noise reduction, which is only really effective when it is receiving information from both ears. If only one ear is aided, even with the best hearing aid in the world, it will be difficult for you to hear in background noise as your brain is trying to retain all of the sounds (including background noise) rather than filtering them out.
Sound quality: We are designed to hear in stereo. Only hearing from one side sounds a lot less natural to us.
Fancy some further reading on this topic? You can read about why two hearing aids are better than one in our article, hearing aids for Both Ears, here
For most people, the main benefit of a rechargeable hearing aid is simple convenience. We are used to plugging in our phones and other devices overnight for them to charge up. Here are some other pros and cons:
For anybody with poor dexterity or issues with their fingers, having a rechargeable aid makes a huge difference, as normal hearing aid batteries are quite small and some people find them fiddly to change.
One downside is that if you forget to charge your hearing aid, then it is a problem that can't be instantly fixed. For most, a 30-minute charge will get you at least two or three hours of hearing, but if you are the type of person who is likely to forget to plug them in regularly, then you're probably better off with standard batteries.
Rechargeable aids are also a little bit bigger and are only available in Behind-the-Ear models.
Finally, just like with a mobile phone, the amount of charge you get on day one is not going to be the same as you get a few years down the line. Be sure to ask what the policy is with the manufacturer's warranty when it comes to replacing the battery.
For most people, the answer is yes. But it's never that simple.
The majority of hearing problems affect the high frequencies a lot more than the low ones. Therefore, open fitting hearing aids sound a lot more natural and ones that block your ears up can make your own voice sound like you are talking with your head in a bucket. Therefore, in-ear aids tend to be less natural.
However, the true answer is we can't tell until we have had a look in your ears to assess the size of your ear canal, and until we have tested your hearing to see which frequencies are being affected.
People with wider ear canals tend to have more flexibility, also there are open fitting modular CIC hearing aids now that do not block your ears.
There is also the age-old rule to consider, that a hearing aid will not help you if it's sat in the drawer gathering dust. If the only hearing aid you would be happy wearing is one that people can't see, then that's what you should get.
Most people can adapt to any type of hearing aid, as long as they know what to expect. Have an honest conversation with your audiologist as to what your needs are.
Generally speaking, six or more. Unless it's none at all. The number of channels a hearing aid has is often a simplistic way an audiologist will use to explain why one hearing aid is better than another, but channels are complex, and it is really not that straightforward. Here are some reasons why:
Hearing aids amplify sounds of different frequencies by different amounts. Most people have lost more high frequencies than low, and therefore need more amplification in the high frequencies. The range of sounds you hear is split into frequency bands or channels, and the hearing aids are set to provide the right amount of hearing at each frequency level.
Less than six channels, and this cannot be done with much accuracy, so six is the magic number. However, a six-channel aid is typically very basic with few other features and is suitable only for hearing a single speaker in a quiet room. The number of channels is not what you should be looking at; it's more the rest of the technology that comes with them.
As a final note, different manufacturers have different approaches. One method is not necessarily better than any other. For example, some manufacturers have as many as 64 channels in their top aids. Most tend to have between 17 and 20. One manufacturer has no channels at all.
Manufacturer's warranties typically last between 2-5 years, depending on the brand and model, and cover defects in materials and workmanship. This includes repairs for component failures, electronic malfunctions, and manufacturing defects, but excludes damage from misuse, accidents, or normal wear. Most manufacturers also include loss and damage insurance for the first year.
We handle all warranty claims on your behalf, liaising with manufacturers and ensuring you get replacement devices quickly when needed. This comprehensive warranty coverage, combined with our lifetime aftercare, gives you complete peace of mind. Find out more about our warranty cover here
Our hearing tests are completely free, whether at our clinics or in your home. Unlike other providers who charge £30-£100 for home visits, we believe hearing healthcare should be accessible without financial barriers. Our comprehensive assessments include examination by an HCPC-registered audiologist, audiogram results, and personalised recommendations.
All testing, future adjustments, and ongoing support are included at no extra cost. While NHS tests are also free, typical 6-week waiting periods often lead people to seek immediate private testing. We provide prompt, professional assessments that fit your schedule and budget.
Yes, we offer completely free home visits throughout the UK, and this service is included in our prices with no additional charges. Home visits are particularly valuable for people with mobility issues, busy schedules, or those who simply prefer the comfort and convenience of their own environment.
Our audiologists can conduct full hearing tests, fit hearing aids, and provide ongoing support in your home. This service sets us apart from many providers who either don't offer home visits or charge extra for them.
We can offer prices up to 40% lower than high street retailers because of our business model. As a network of 200+ independent audiologists, we don't have the massive overheads of large retail chains - no expensive high street premises, no sales targets pushing audiologists to sell the most expensive options, and no costly marketing campaigns.
However, we maintain the same buying power as the big chains because we purchase on behalf of our entire nationwide network. This means you get access to the same premium hearing aids with professional service, but at genuinely competitive prices.
We offer a comprehensive 60-day money-back guarantee, which gives you twice the industry standard time to properly assess whether your hearing aids are right for you. This extended period recognises that adjusting to hearing aids takes time, and your brain needs several weeks to adapt to the amplified sounds.
Unlike many providers who offer just 30 days, we believe 60 days gives you the confidence to test your hearing aids in all the situations that matter to you - from quiet conversations at home to busy restaurants and outdoor activities.
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