Cochlear implant
A surgically placed device that can give a useful sense of sound to people with severe or profound hearing loss who get little benefit from hearing aids.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- A cochlear implant can give a useful sense of sound to people with severe or profound hearing loss who get little help from hearing aids.
- It does not restore normal hearing, sounds different at first, and results vary widely between people.
- Success depends on months of rehabilitation and listening practice, not just the operation.
- There are clear NHS (NICE) eligibility criteria, and assessment is done by a specialist team — it is a long-term commitment, not a quick fix.
A plain-English summary. The detail — including risks and recovery — is below.
At a glance
A general guide. Your surgeon will give you advice for your situation.
Can give a useful sense of sound to people who get little help from hearing aids
Your hearing loss is still helped well enough by hearing aids, so an implant is not needed yet.
The wound behind the ear heals. Expect some swelling, numbness and possibly dizziness. The implant is not yet switched on.
A structured switch-on, tuning and rehabilitation programme with a named team.
The wound behind the ear heals. Expect some swelling, numbness and possibly dizziness. The implant is not yet...
The external processor is fitted and activated for the first time. Sounds often seem strange, mechanical or beepy...
Regular appointments adjust the device, and you take part in rehabilitation — listening practice that helps your...
Hearing continues to improve for many people over the first year, with lifelong follow-up, processor updates and...
What is a cochlear implant?
A cochlear implant is a device for people with severe to profound hearing loss who no longer get enough benefit from ordinary hearing aids. Unlike a hearing aid, which makes sounds louder, a cochlear implant bypasses the damaged part of the inner ear and stimulates the hearing nerve directly.
It has two parts: an internal part placed during an operation under general anaesthetic, and an external sound processor worn behind the ear or on the body, which is fitted a few weeks later when the wound has healed.
A cochlear implant does not restore normal hearing, and the sound it gives is different from natural hearing. With time and practice it can give many people a very useful sense of sound and a real improvement in understanding speech, but results vary from person to person, and success depends heavily on rehabilitation — the listening practice and support that follow.
Getting an implant is a long-term commitment that begins with a detailed assessment by a specialist team, includes surgery and switch-on, and continues with months of rehabilitation and lifelong follow-up. It is rarely an urgent decision, and there is time to consider it carefully.
Types & techniques
There isn't one single operation. The right approach depends on you — which is something to discuss with your surgeon.
Hearing aid vs cochlear implant
| Hearing aid | Cochlear implant | |
|---|---|---|
| How it works | Makes sound louder | Stimulates the hearing nerve |
| Needs surgery | No | Yes |
| Suits | Mild to severe loss | Severe/profound, poor aid benefit |
| Restores normal hearing | No | No |
| Learning curve | Shorter | Months of rehabilitation |
A cochlear implant is usually considered only after hearing aids have been properly tried and found not to give enough benefit.
Preparing for your surgery
- Expect a detailed assessment by a specialist cochlear implant team, including hearing tests, scans of the inner ear and discussion of expectations.
- Hearing aids are usually tried properly first, because implants are for people who get little benefit from them.
- Talk honestly with the team about what you hope for, so expectations are realistic.
- Ask about the rehabilitation programme and the time and travel it will involve.
- Make sure you are up to date with recommended vaccinations, as your team will advise, because implants can slightly raise the risk of certain infections.
- For children, parents or guardians are closely involved in assessment, decision-making and rehabilitation.
- Tell the team about other health conditions and medicines, and arrange a lift home after the operation.
What happens
The operation is done under general anaesthetic, so you are asleep. The surgeon makes a cut behind the ear and places the internal part of the implant under the skin, threading a fine electrode into the cochlea (the hearing part of the inner ear). The operation usually takes a couple of hours per ear.
Nothing is switched on at the time of surgery. The external sound processor is fitted and first activated a few weeks later, once the wound has healed. This switch-on is the start, not the end, of the process.
After switch-on, an audiologist gradually adjusts the device over several appointments, and you begin rehabilitation — structured listening practice that helps your brain learn to make sense of the new signals. This continues for months, with lifelong follow-up afterwards.
Is this operation right for me?
A good consultation should explore whether it's the right choice for you now — including reasons to wait or consider something else.
May not be suitable if…
- Your hearing loss is still helped well enough by hearing aids, so an implant is not needed yet.
- The hearing nerve or inner ear is absent or too damaged for an implant to work (the team checks this with scans and tests).
- You are not fit enough for a general anaesthetic.
- Expectations cannot be made realistic, or there is no way to commit to the rehabilitation an implant needs.
Delay surgery if…
- A proper trial of hearing aids has not yet been completed.
- Recommended vaccinations are not yet up to date.
- There is an active ear or other infection that needs treating first.
- You need more time and information to decide on a long-term commitment.
- For children, more assessment of hearing and development is still needed.
Alternatives to discuss
- Well-fitted hearing aids, if they still give enough benefit.
- Other implantable hearing devices, such as bone-conduction or middle-ear devices, for certain types of hearing loss.
- Assistive listening devices, lip-reading and communication support.
- Watchful waiting with regular hearing reviews if the loss is borderline.
- Doing nothing for now, with support and information, if you are not ready to proceed.
Before you decide
Use this as a shared-decision checklist. The aim is not just “can this be done?”, but whether it is right for you, now, with the risks and alternatives clearly understood.
What matters most to me?
Think about symptoms, daily life, work, caring responsibilities, sport, fertility, travel, appearance and anxiety — the right choice depends on your priorities, not just the medical facts.
What are all my options?
Ask about waiting, monitoring, medicines, rehabilitation, a smaller or larger procedure, a different test, NHS referral, or a second opinion where that would help.
What would make me pause?
Active infection, pregnancy, unstable medical problems, smoking, medicines that increase bleeding, poor support at home, or feeling pressured are all reasons to slow down and get tailored advice.
What happens if I do nothing today?
For some problems, waiting is safe; for others, delay can make treatment harder. A good consultation should explain the trade-off in plain English.
Anaesthetic choices
The safest option depends on the operation, your health, the facility and your surgeon/anaesthetist. Ask what is planned and why.
Benefits
- Can give a useful sense of sound to people who get little help from hearing aids
- Often improves the ability to understand speech, especially with rehabilitation
- Can make everyday sounds and warning sounds easier to detect
- May make telephone use and conversation easier for some people over time
- For children, can support the development of listening and spoken language when fitted early
Risks & complications
- Pain, swelling and numbness around the ear after surgery, which usually settles
- Altered or odd taste for a while
- Dizziness or unsteadiness in the early period
- Sound that seems strange or artificial at first and takes time to get used to
- Wound infection or healing problems
- Ringing in the ear (tinnitus) that is new or changed
- Lasting changes to taste or balance
- The implant not giving as much benefit as hoped
- Device failure needing further surgery to replace the implant
- Facial nerve problems, causing weakness of part of the face
- Meningitis (the reason vaccination is advised)
- A build-up of fluid (CSF leak) or other serious surgical complication
The two most important things to understand are that an implant does not restore normal hearing, and that results vary and depend on rehabilitation. Surgical risks are usually low but include rare but serious problems such as facial nerve injury and meningitis. Ask the team about your likely benefit, the rehabilitation involved, the small extra risk of meningitis and the vaccinations advised.
Published figures to discuss
Cochlear implant complication rates vary between children and adults, primary and revision surgery, anatomy, infection risk and device era. Large series suggest major complications are uncommon but not negligible, and device-related problems can require reimplantation.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Major complications | Around 4–5% in a large 1,452-implant series | Included problems such as flap issues, device failure, major infection or other problems needing significant treatment. | Cochlear implant complications in 1,452 implantations — PMCpmc.ncbi.nlm.nih.govPublished figure |
| Minor complications | Around 5% in the same large series | Minor wound, taste, dizziness, tinnitus or temporary symptoms may still be distressing. | Cochlear implant complications in 1,452 implantations — PMCpmc.ncbi.nlm.nih.govPublished figure |
| Device failure or need for reimplantation | Low single digits in many series | May happen early or years later and usually needs further surgery. | Cochlear implant complications in 1,452 implantations — PMCpmc.ncbi.nlm.nih.govPublished figure |
| Facial nerve weakness | Rare, generally under 1% in published series | Usually temporary when it occurs, but lasting weakness is an important consent point. | Cochlear implant complications in 1,452 implantations — PMCpmc.ncbi.nlm.nih.govPublished figure |
| Meningitis | Very rare, but serious | Vaccination and prompt treatment of ear infections reduce risk. | Cochlear implant complications in 1,452 implantations — PMCpmc.ncbi.nlm.nih.govSource-linked context |
These are literature figures, not a personalised prediction. Your own risks and likely benefits depend on your circumstances, your health, and how your care is carried out and followed up.
Recovery — what to expect, and when
Recovery from the operation itself is usually short, but learning to hear with an implant is a much longer journey. The device is switched on a few weeks after surgery, and your hearing improves gradually over months as you practise and the device is fine-tuned.
- Numbness, swelling or tightness behind the ear that settles over weeks
- Sounds seeming odd, robotic or unfamiliar at first after switch-on
- Tiredness from concentrating hard on listening in the early weeks
- Gradual, not instant, improvement in understanding speech
Aftercare
- Keep the wound clean and dry and follow the team's advice on washing your hair.
- Attend all switch-on and tuning appointments, as the device needs gradual adjustment.
- Commit to the rehabilitation programme — listening practice is what makes the difference.
- Look after the external processor and follow advice on batteries, moisture and sport.
- Keep up the vaccinations your team recommends.
- Carry your implant identification card and tell other clinicians you have an implant (for example before an MRI scan).
- Contact the team if you notice infection, sudden loss of sound, facial weakness or balance problems.
- Someone to drive you home after the operation
- Time off work or school booked for the operation and switch-on
- Switch-on and rehabilitation appointments understood and diarised
- Recommended vaccinations up to date
- A plan for travel to the many follow-up appointments
- Implant identification card kept safe
- The team's contact and out-of-hours number saved
Scars and how they heal
The operation leaves a scar behind the ear, often hidden by hair, where the internal part of the implant is placed. It is usually swollen and numb at first and settles over weeks to months. Your surgeon will explain what to expect for your scar and the small bump where the implant sits under the skin.
⚠ Get urgent help if…
- Spreading redness, swelling, heat or discharge around the wound (possible infection)
- New weakness or drooping of one side of the face
- A severe headache with a stiff neck, fever or feeling very unwell — seek emergency help (possible meningitis)
- Clear fluid leaking from the ear or wound
- Sudden, complete loss of sound from the implant
- Severe or persistent dizziness or vomiting
Who to contact: your surgeon or clinic first (keep their number to hand). For urgent advice when you can't reach them, call NHS 111. In an emergency, call 999.
General guidance — it doesn't replace the specific advice your surgeon gives you.
Results & realistic expectations
A good result is a useful, reliable sense of sound and an improved ability to understand speech, achieved gradually with rehabilitation. Many people do very well, but results vary widely depending on factors such as how long the hearing loss was present, the cause, and the listening practice put in afterwards.
A cochlear implant cannot restore normal hearing, and it cannot promise a particular level of speech understanding. Your team should set realistic expectations with you before surgery and review your progress over the first year and beyond.
The internal implant is designed to last many years, but it is an electronic device and can occasionally fail and need replacing with further surgery. The external processor is updated and replaced over time, and the team supports this through long-term follow-up. Your hearing needs and the technology both change over the years.
Combining with other procedures
A cochlear implant in one ear is sometimes combined with a hearing aid in the other ear, where that ear still gets some benefit, to give a more balanced sense of sound. Your team will advise what suits you best.
Follow-up & long-term care
After switch-on you will have a series of tuning appointments and rehabilitation sessions over the first months, then regular reviews for life. These check the device, your hearing progress and the equipment, and update the processor over time. There should always be a clear way to contact the team with problems.
- Daily care of the external processor, including batteries and keeping it dry
- Regular tuning and review appointments, especially in the first year
- Processor upgrades and equipment replacement over the years
- Keeping recommended vaccinations up to date
- Telling other clinicians about the implant, for example before MRI scans
Revision and secondary surgery reality
- The internal implant is an electronic device and can occasionally fail, needing further surgery to replace it.
- Some people get less benefit than hoped despite full rehabilitation.
- External processors are upgraded and replaced over the years as technology changes.
- Re-implantation may be needed if there is a device problem or, rarely, an infection.
Ask your surgeon for their own revision rate, what counts as a revision, and what is included in the written aftercare policy.
What good aftercare looks like
- A structured switch-on, tuning and rehabilitation programme with a named team.
- Clear advice on vaccinations and on telling other clinicians about the implant (for example before MRI).
- Lifelong follow-up, equipment support and processor upgrades.
- A clear route to report infection, facial weakness, loss of sound or balance problems.
- Realistic, honest review of progress over the first year and beyond.
What affects the cost
Costs vary a great deal between people and providers, and we don't publish prices. What matters is understanding what drives the cost and making sure your quote is complete. The main things that affect it:
- Whether one or both ears are implanted
- The implant device and external processor chosen
- The surgeon's and anaesthetist's fees and theatre costs
- The extensive assessment before surgery
- Switch-on, tuning and rehabilitation appointments
- Long-term follow-up, equipment and future processor upgrades
- The full assessment before surgery
- The surgeon's and anaesthetist's fees and hospital costs
- The implant device and external processor
- Switch-on, tuning and the rehabilitation programme
- Long-term follow-up and who provides it
- Equipment, batteries, repairs and future processor upgrades
- What happens, and what it costs, if the device fails or further surgery is needed
On the NHS? Cochlear implants are available on the NHS for adults and children who meet the NICE eligibility criteria; private assessment and implantation are also possible, but the same careful assessment and rehabilitation are needed.
You're entitled to your total cost in writing — including aftercare and any revision — before you decide.
Consent traps and marketing red flags
These are not small details. They are often where patients lose choice, time to reflect, or realistic expectations.
Consent traps
- Suggesting an implant will restore normal hearing.
- Not setting realistic, individual expectations about likely benefit.
- Underplaying the months of rehabilitation and lifelong follow-up involved.
- Not explaining the small extra risk of meningitis and the need for vaccination.
- Not discussing what happens if the device fails or does not help.
Marketing red flags
- Promising restored or normal hearing.
- Quoting impressive success figures without explaining how much outcomes vary.
- Playing down the assessment, rehabilitation and long-term commitment.
- Not mentioning the small risk of meningitis or the need for vaccination.
- Pushing surgery before hearing aids have been properly tried.
Choosing a surgeon safely
- Check your surgeon is on the GMC Specialist Register for this area.
- Make sure they practise at a CQC-registered location, and look for membership of bodies like BAAPS or BAPRAS.
- You're entitled to a two-stage consent process with time to reflect (a cooling-off period). The surgeon who will operate must consent you — not a salesperson.
- Be wary of pressure: time-limited offers, discounts or deposits taken before you've had time to think are red flags, not bargains.
- You're entitled to your total cost in writing — including aftercare and any revision — before you decide.
Questions to ask your medical professional
Take this to your consultation. A good surgeon will welcome every one of these.
- Am I likely to get more benefit from an implant than from my current hearing aids?
- What level of hearing improvement is realistic for someone like me, and what affects it?
- What does the rehabilitation involve, and how many appointments and how much travel?
- Would one implant or two be better for me, and why?
- What are the risks of facial nerve problems and meningitis, and which vaccinations do I need?
- What happens if the implant fails or does not help as much as hoped?
- Are you on the GMC Specialist Register for this area, and which Royal College or professional body are you a member of?
- Will you be the surgeon who carries out my operation, and who looks after me afterwards?
- What are the risks for someone like me, and how often do your own patients have a problem or need it repeated or redone?
- What does a realistic result look like — and what can this operation not achieve?
- What are my options, including waiting, doing nothing for now, or choosing a different approach?
- Can I have written information, results and aftercare instructions in a format I can use, including any accessibility or communication support I need?
- What is the total cost in writing, including any follow-ups, and how much time do I have to decide?
Frequently asked questions
Will a cochlear implant give me normal hearing?
Who can have a cochlear implant on the NHS?
When will I hear after the operation?
How much work is the rehabilitation?
Why do I need vaccinations?
Can I have an MRI scan with an implant?
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How we made this page
Medically reviewed by a GMC-registered consultant. Written in plain English, checked against NHS, NICE, GMC and relevant Royal College / specialist-society guidance, and kept under review. No clinic paid to appear on this page, and we publish no pricing. This is general information to help you prepare — it is not a substitute for advice from your own clinician. How we review our guides →
Source hierarchy: UK regulator and NHS/NICE guidance first, then relevant Royal College or specialist-society guidance, then peer-reviewed evidence for procedure-specific figures where available.
Sources & standards: NICE — Cochlear implants for severe to profound deafness (TA566) British Cochlear Implant Group — information ENT UK — patient information Impact of NICE TA566 on access to cochlear implantation (PMC) Cochlear implant complications in 1,452 implantations — PMC Facial nerve injury and cochlear implants — NAP
Reviews reflect patients' experience of care, not clinical outcomes. For procedure volumes and outcome data see PHIN.
Last medically reviewed 2026-09-21. Spotted something wrong or out of date? Report an error in this guide.
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