Hearing Aids

Table of Contents

1. What Hearing Aids Do (and What They Can't)
2. Who Benefits
3. Styles: BTE, RIC, ITE, ITC, CIC
4. Key Features Worth Understanding
5. Prescription vs. Over-the-Counter Hearing Aids
6. How to Get Fitted
7. Cost, Insurance & Medicare
8. Hearing Loss, Hearing Aids & Brain Health
9. Care & Troubleshooting
10. Alternatives: Cochlear Implants & Assistive Devices
11. Situations That Involve an Audiologist
12. Key Research Papers
13. Connections
14. Featured Videos

What Hearing Aids Do (and What They Can't)

Every modern hearing aid does four things in sequence. A tiny microphone captures sound and converts it to a digital signal. A processor — the "brain" of the device — analyzes that signal and amplifies the specific pitches you struggle to hear while leaving the pitches you hear fine alone. A receiver (a miniature speaker) delivers the reshaped sound into your ear. And a battery powers the whole thing. This selective, frequency-specific amplification is the crucial difference between a real hearing aid and a cheap sound amplifier: age-related hearing loss almost always affects high pitches (consonants like s, f, th, and k) far more than low pitches (vowels), which is why speech can sound loud but muddy. A hearing aid restores the missing treble so words become clear, not just louder.

What a hearing aid cannot do is restore normal hearing. It works with the hearing you still have. It cannot regrow the delicate hair cells of the inner ear that noise and age have destroyed, and it cannot make a noisy restaurant sound like a quiet room. Even the best devices struggle when many people talk at once, because separating one voice from a wall of competing sound is a task the human brain, not the microphone, ultimately performs. Managing expectations honestly is the single best predictor of success: people who understand that a hearing aid is an aid — a powerful assist, not a cure — are far more likely to keep wearing it.

Who Benefits

Hearing loss is measured in decibels of hearing level (dB HL) and graded by degree. A hearing test (audiogram) places your hearing into one of these bands:

• Mild (26–40 dB HL): You catch most conversation one-on-one in quiet but lose words in groups, on the phone, or with background noise. Hearing aids — including over-the-counter devices — help substantially.
• Moderate (41–55 dB HL): You miss a large share of normal conversation without amplification. This is the sweet spot for hearing aids.
• Moderately severe to severe (56–90 dB HL): Conversation is inaudible or nearly so without powerful, professionally fitted aids. These require prescription devices, not over-the-counter.
• Profound (over 90 dB HL): Hearing aids may offer limited benefit; a cochlear implant is often the better option.

The type of loss matters as much as the degree. Most hearing loss in adults is sensorineural — permanent damage to the inner ear or hearing nerve from age (presbycusis), noise, genetics, or certain medications — and this is exactly what hearing aids are built to treat. Conductive loss, caused by a mechanical blockage such as earwax, fluid, a perforated eardrum, or otosclerosis, may be correctable with medication or surgery, in which case a hearing aid may not be the answer. A one-sided or suddenly worsening loss is a recognized red flag that ear specialists examine before any amplification — see Sudden Sensorineural Hearing Loss.

Styles: BTE, RIC, ITE, ITC, CIC

Hearing aids come in a family of shapes that trade visibility against power, battery life, and ease of handling. There is no single "best" style — the right one depends on your degree of loss, ear anatomy, dexterity, and how the device feels to you.

• Behind-the-ear (BTE): The classic shape — a case rests behind the ear and a clear tube carries sound to an earmold in the canal. BTEs are the most powerful and durable, fit any degree of loss up to profound, and are easiest to handle, making them a common choice for children and people with dexterity challenges.
• Receiver-in-canal (RIC), also called RITE: The most popular style sold today. Like a slimmer BTE, but the speaker sits inside the ear canal on a thin wire rather than in the case. This gives natural, open sound, a discreet profile, and easy repair (the receiver just clicks out). Suits mild to severe loss.
• In-the-ear (ITE): A custom shell fills the outer bowl of the ear. Larger than canal styles, so it fits bigger controls, a longer battery, and a telecoil — useful for mild to severe loss.
• In-the-canal (ITC): A smaller custom fit that sits in the canal opening — less visible than an ITE, for mild to moderately severe loss.
• Completely-in-canal (CIC) and invisible-in-canal (IIC): The most discreet options, seated deep in the canal. They are nearly invisible but have the shortest battery life, the smallest (fiddly) controls, and less room for advanced features. Best for mild to moderate loss in people who prioritize invisibility.

A general rule: the smaller and more hidden the device, the less power and fewer features it can hold, and the harder it is to handle. Many first-time users are surprised that the discreet RIC style now dominates precisely because it balances all of these well.

Key Features Worth Understanding

Marketing overwhelms buyers with feature lists. A handful genuinely change day-to-day experience:

• Directional microphones: Two or more microphones let the device emphasize sound coming from in front of you (the person you are talking to) while suppressing sound from behind. This is one of the most effective tools for hearing in noise, and it is why hearing aids beat simple amplifiers.
• Digital noise reduction: Software that identifies steady background noise (fans, engines, air conditioning) and lowers it. It improves comfort and listening ease; it does not make speech in a loud crowd fully clear.
• Bluetooth streaming: Sends phone calls, music, TV, and video-call audio straight from your phone or a small transmitter into the hearing aids — turning them into wireless earbuds tuned to your exact hearing. Increasingly standard, and a major quality-of-life feature.
• Rechargeable batteries: A charging cradle replaces the tiny disposable zinc-air batteries that many people find hard to change. One overnight charge typically lasts a full day (streaming shortens it). Excellent for anyone with vision or dexterity limits.
• Telecoil (t-coil): A small copper coil that picks up a magnetic signal directly, cutting out background noise. It connects you to hearing loops installed in many theaters, churches, ticket counters, and public venues (look for the ear-with-a-T symbol), and to compatible telephones. Often overlooked, genuinely valuable, and free to activate.
• Multiple programs and smartphone apps: Let you switch settings for quiet, restaurants, music, or the phone, and fine-tune volume yourself. Convenient, but not a substitute for a correct base fitting.

Prescription vs. Over-the-Counter Hearing Aids

In 2017, Congress passed the Over-the-Counter Hearing Aid Act, and in August 2022 the U.S. Food and Drug Administration finalized a new regulatory category that took effect in October 2022. For the first time, adults (18 and older) with perceived mild to moderate hearing loss can buy U.S. Food and Drug Administration-regulated hearing aids directly — in pharmacies, big-box stores, and online — without a medical exam, a prescription, or a professional fitting. This was a landmark change aimed squarely at the access and affordability problems that the National Academies of Sciences, Engineering, and Medicine had spotlighted in 2016.

Over-the-counter hearing aids are real hearing aids, not toys. They are self-fitted, usually with a smartphone app and a built-in hearing check, and cost roughly $200 to $1,000 per pair — a fraction of prescription prices. For someone with genuine mild-to-moderate loss who is comfortable with technology, the evidence suggests they can perform remarkably well. In a 2017 randomized trial, 154 adults aged 55 to 79 with mild to moderate hearing loss completed 6 weeks wearing the same high-end device: an over-the-counter style model, in which people chose their own pre-programmed aids, "yielded only slightly poorer outcomes" than audiologist best practices, with similar effect sizes. Satisfaction was significantly lower, and fewer people in that group were likely to buy aids after the trial (55%, against 81% with an audiologist and 36% with placebo settings). That trial's abstract reports no cost comparison; the price gap is the retail difference given above.

A 2023 randomized trial analysed 64 adults with self-perceived mild to moderate hearing loss, comparing a self-fitted over-the-counter hearing aid with remote support against the same device fitted by audiologists. The self-fitting group had an early advantage on self-reported measures at 2 weeks, and after 6 weeks there were no meaningful differences on any outcome. Three of the authors reported financial ties to a hearing-technology company.

Prescription hearing aids, dispensed by an audiologist or hearing instrument specialist, remain the right choice when your loss is more than moderate, when it is uneven between ears or one-sided, when you have ringing, dizziness, drainage, or pain, when a child needs devices, or simply when you want professional programming, verification, and ongoing support. They also cover the full power range that over-the-counter devices legally cannot.

A crucial distinction: over-the-counter hearing aids are not the same as PSAPs (personal sound amplification products). PSAPs are unregulated gadgets marketed for recreational use by people with normal hearing — birdwatching, hunting — and are not intended or tested to treat hearing loss. If a product is not labeled a U.S. Food and Drug Administration (FDA) "over-the-counter hearing aid," it has not met the new safety and performance standards.

How to Get Fitted

Whether you go the professional or over-the-counter route, a good fitting follows the same logic: measure the loss, program the device to match it, and verify the result.

1. The audiogram. A hearing test in a sound booth (or a validated app-based screen for over-the-counter) charts the softest sounds you can hear at each pitch in each ear. This map is the prescription the hearing aid is programmed against.
2. Programming to a target. Using a validated formula, the audiologist sets how much gain the device applies at each frequency. Too little and you still miss speech; too much and everything is harsh and tiring.
3. Real-ear measurement (REM). This is the step that separates a good fitting from a guess, yet many people never receive it. A thin probe microphone is placed in your ear canal alongside the hearing aid to measure what actually reaches your eardrum, and the device is adjusted to hit prescribed targets in your ear, not an average ear. Research and best-practice guidelines strongly support REM, and audiologists differ in whether they perform it.
4. The adjustment period. This is the part no one warns you about. After years of silence, your brain has "forgotten" many everyday sounds — your own footsteps, the refrigerator, the rustle of paper — and at first they feel intrusive and your own voice may sound odd. This is normal acclimatization. Adapting typically involves consistent wear, starting in quiet settings and building up, over several weeks to a few months. Most people who abandon hearing aids do so in the first few weeks; those who push through this window and return for fine-tuning adapt and thrive.

Cost, Insurance & Medicare

Cost is the number-one reason people go without. A pair of prescription hearing aids in the United States typically runs $2,000 to $7,000, and that price is usually bundled — it includes the devices plus the audiologist's testing, fitting, verification, follow-up visits, and adjustments over several years. When prices are compared, what the bundle includes matters, because a cheaper "unbundled" device may cost more once you add professional services. The arrival of over-the-counter devices has introduced genuine low-cost competition, with capable pairs available for a few hundred dollars.

Here is what surprises most Americans: Original Medicare (Parts A and B) does not cover hearing aids or the exams to fit them. This exclusion has been in the law since Medicare began in 1965. However:

• Medicare Advantage (Part C) plans frequently include a hearing benefit that covers part of the cost — coverage varies widely by plan, so read the details.
• Medicaid covers hearing aids for adults in many (not all) states, and for children in every state.
• The VA provides hearing aids at no cost to eligible veterans and is one of the largest dispensers in the country.
• Some private and employer insurance, and FSA/HSA accounts, can offset the cost. A few states mandate coverage for children.

Untreated hearing loss is not free either. It is associated with substantially higher overall health-care costs over time — more hospitalizations, more visits, and higher rates of the very conditions (falls, depression, cognitive decline) that treatment may help prevent. Some people frame a hearing aid that way: less an expense than an investment in staying well.

Hearing Loss, Hearing Aids & Brain Health

One widely discussed reason for treating hearing loss has nothing to do with the ears. Over the past fifteen years, a striking body of research has tied hearing loss to accelerated cognitive decline and dementia. In a landmark 2011 study, older adults with hearing loss developed dementia at higher rates than those with normal hearing, and the risk rose with the severity of the loss. Subsequent work confirmed faster cognitive decline in people with untreated hearing loss. The influential 2020 Lancet Commission on dementia prevention ranked hearing loss as the single largest potentially modifiable risk factor for dementia across the life course.

Why would the ears affect the mind? Leading theories include the extra cognitive load of straining to decode muffled speech (mental effort borrowed from memory and thinking), the social isolation and depression that hearing loss breeds, and reduced stimulation of brain regions that process sound. If hearing loss contributes to decline, the hopeful corollary is that treating it might help — and several observational studies (Amieva's 25-year cohort, Mahmoudi's claims analysis) found that hearing-aid users had slower decline or later diagnoses of dementia, depression, and falls than non-users. The claims analysis covered 114,862 adults aged 66 and older with diagnosed hearing loss. Within 3 years, hearing aid users compared with non-users had hazard ratios of 0.82 for Alzheimer disease or dementia, 0.89 for anxiety or depression, and 0.87 for injurious falls (below 1 means lower risk). Its authors state that randomized trials are needed to determine whether the link is causal.

Two later observational studies add to this picture, and neither can prove cause. Among 1,863 United States adults with measured hearing loss, in a national survey linked to death records with a median of about 10 years of follow-up, regular hearing aid users had a lower death rate than never users (adjusted hazard ratio 0.76, 95% confidence interval 0.60-0.95), while occasional users did not differ (0.93, 0.70-1.24). In a 2025 analysis from the Framingham Heart Study, people with hearing loss who were under 70 when their hearing was assessed and who used hearing aids had a 61% lower risk of dementia than non-users (hazard ratio 0.39, 95% confidence interval 0.17-0.89, a wide range), with no association at age 70 or older (0.93, 0.63-1.36). Hearing aid use there was a self-reported yes or no, and the authors note that users may have had better access to health care.

The gold-standard test of that idea was the ACHIEVE randomized trial, published in The Lancet in 2023. Nearly 1,000 older adults with untreated hearing loss were randomly assigned to a hearing intervention or a health-education control and followed for three years. Honest reading matters here: across the whole group, the hearing intervention did not significantly slow three-year cognitive decline. But a prespecified sensitivity analysis split the trial by where participants were recruited. In the 238 drawn from a long-running study of heart health, who were older and had more risk factors for cognitive decline, the hearing intervention was linked to a slowing of 3-year cognitive decline by about 48% (difference 0.191, 95% confidence interval 0.022-0.360). In the other 739 healthy community volunteers there was no significant difference. The authors conclude that a hearing intervention "might reduce cognitive change" over 3 years in older adults at increased risk of cognitive decline but not in those at lower risk, so treating hearing loss is not a guaranteed dementia preventive for everyone. No significant adverse events attributed to the study were reported, and the benefits to communication, safety, and mood described on this page are a separate reason people treat a loss.

Care & Troubleshooting

Hearing aids live in a warm, waxy, humid environment, so a little daily maintenance dramatically extends their life and performance.

• Keep them dry. Wipe them with a dry cloth nightly, open the battery door (or place rechargeables in the charger), and store them in a drying jar or electric dryer — never in the bathroom during a shower. Remove them before swimming or heavy sweating unless they are rated for it.
• Manage earwax. Wax is the leading cause of "dead" hearing aids. Change the small wax guard filter regularly and clean the tip with the supplied brush.
• Handle over a soft surface so a dropped device lands on a bed or towel, not tile.
• Batteries and charging. Zinc-air batteries activate when you peel the sticker — wait a minute before inserting. Keep spares away from coins and children (button batteries are dangerous if swallowed). Charge rechargeables nightly.

If a hearing aid goes quiet or weak, work through the simple causes before assuming it is broken: check for a fresh or charged battery; inspect the tip and wax guard for a blockage and replace the guard; make sure the receiver tube isn't kinked or plugged; and confirm the volume and program settings. Whistling feedback usually means the device isn't seated fully, the dome is the wrong size, or there is earwax reflecting sound — reinsert it and have the fit checked. If cleaning and a new battery don't help, the device needs professional service.

Alternatives: Cochlear Implants & Assistive Devices

Hearing aids are the right tool for most losses, but not all.

A cochlear implant is a surgically implanted device for people with severe-to-profound sensorineural hearing loss who get too little benefit from hearing aids. Rather than amplifying sound, it bypasses the damaged hair cells entirely: an external processor sends signals to an implanted electrode array that stimulates the hearing nerve directly. It requires surgery and a period of rehabilitation to learn to interpret the new signal, and it can restore useful hearing and speech understanding when hearing aids no longer can. People who wear powerful hearing aids and still can't follow conversation are the group a cochlear implant evaluation is for, and many candidates are described as being referred very late.

Assistive listening devices (ALDs) can be used alongside hearing aids or on their own for specific situations:

• Personal amplifiers and remote microphones a companion wears, to hear one voice across a table or a car.
• TV streamers that send audio wirelessly into your aids so you and family can share a comfortable volume.
• Captioned telephones that display the caller's words as text.
• Hearing loops in public venues, accessed through a telecoil.
• Alerting devices — amplified or vibrating alarms, doorbell and smoke-alarm signalers — for safety at home.

Situations That Involve an Audiologist

Over-the-counter devices have opened a sensible do-it-yourself path for straightforward mild-to-moderate loss. But some situations call for a professional — an audiologist or otolaryngologist — before, or instead of, buying anything off a shelf. These are the situations usually listed:

• Your hearing loss came on suddenly, is much worse in one ear, or is fluctuating — this can be a medical emergency (see Sudden Sensorineural Hearing Loss).
• You have ear pain, drainage, or a history of ear infections, or the ear feels blocked (wax, fluid, or infection are the causes looked for first).
• You have ringing (tinnitus) in one ear, dizziness, or balance problems accompanying the loss (see Tinnitus and Ménière's Disease).
• Your loss is more than moderate, and over-the-counter devices legally cannot deliver enough power.
• The person needing help is a child.
• You have tried over-the-counter aids and are not getting the benefit you hoped for, or you simply want professional testing, real-ear verification, and ongoing care.

Getting your hearing tested carries no risk and no obligation to buy, and it establishes the baseline every future decision rests on. Whichever path a person takes, the first step, acting on a hearing loss, ends a delay that averaged 8.9 years in the study described at the top of this page.

Key Research Papers

1. Lin FR, Metter EJ, O'Brien RJ, Resnick SM, Zonderman AB, Ferrucci L. Hearing loss and incident dementia. Archives of Neurology. 2011;68(2):214-220. — doi:10.1001/archneurol.2010.362
2. Lin FR, Yaffe K, Xia J, et al. Hearing loss and cognitive decline in older adults. JAMA Internal Medicine. 2013;173(4):293-299. — doi:10.1001/jamainternmed.2013.1868
3. Livingston G, Huntley J, Sommerlad A, et al. Dementia prevention, intervention, and care: 2020 report of the Lancet Commission. The Lancet. 2020;396(10248):413-446. — doi:10.1016/S0140-6736(20)30367-6
4. Lin FR, Pike JR, Albert MS, et al. Hearing intervention versus health education control to reduce cognitive decline in older adults with hearing loss in the USA (ACHIEVE): a multicentre, randomised controlled trial. The Lancet. 2023;402(10404):786-797. — doi:10.1016/S0140-6736(23)01406-X
5. Ferguson MA, Kitterick PT, Chong LY, Edmondson-Jones M, Barker F, Hoare DJ. Hearing aids for mild to moderate hearing loss in adults. Cochrane Database of Systematic Reviews. 2017;(9):CD012023. — doi:10.1002/14651858.CD012023.pub2
6. Humes LE, Rogers SE, Quigley TM, Main AK, Kinney DL, Herring C. The effects of service-delivery model and purchase price on hearing-aid outcomes in older adults: a randomized double-blind placebo-controlled clinical trial. American Journal of Audiology. 2017;26(1):53-79. — doi:10.1044/2017_AJA-16-0111
7. Chisolm TH, Johnson CE, Danhauer JL, et al. A systematic review of health-related quality of life and hearing aids: final report of the American Academy of Audiology Task Force on the Health-Related Quality of Life Benefits of Amplification in Adults. Journal of the American Academy of Audiology. 2007;18(2):151-183. — doi:10.3766/jaaa.18.2.7
8. National Academies of Sciences, Engineering, and Medicine. Hearing Health Care for Adults: Priorities for Improving Access and Affordability. Washington, DC: The National Academies Press. 2016. — doi:10.17226/23446
9. Reed NS, Altan A, Deal JA, et al. Trends in health care costs and utilization associated with untreated hearing loss over 10 years. JAMA Otolaryngology–Head & Neck Surgery. 2019;145(1):27-34. — doi:10.1001/jamaoto.2018.2875
10. Mahmoudi E, Basu T, Langa K, et al. Can hearing aids delay time to diagnosis of dementia, depression, or falls in older adults? Journal of the American Geriatrics Society. 2019;67(11):2362-2369. — doi:10.1111/jgs.16109
11. Amieva H, Ouvrard C, Giulioli C, Meillon C, Rullier L, Dartigues JF. Self-reported hearing loss, hearing aids, and cognitive decline in elderly adults: a 25-year study. Journal of the American Geriatrics Society. 2015;63(10):2099-2104. — doi:10.1111/jgs.13649
12. Dawes P, Emsley R, Cruickshanks KJ, et al. Hearing loss and cognition: the role of hearing aids, social isolation and depression. PLOS ONE. 2015;10(3):e0119616. — doi:10.1371/journal.pone.0119616
13. Simpson AN, Matthews LJ, Cassarly C, Dubno JR. Time from hearing aid candidacy to hearing aid adoption: a longitudinal cohort study. Ear and Hearing. 2019;40(3):468-476. — doi:10.1097/AUD.0000000000000641
14. De Sousa KC, Manchaiah V, Moore DR, Graham MA, Swanepoel W. Effectiveness of an over-the-counter self-fitting hearing aid compared with an audiologist-fitted hearing aid: a randomized clinical trial. JAMA Otolaryngology–Head & Neck Surgery. 2023;149(6):522-530. — doi:10.1001/jamaoto.2023.0376
15. Choi JS, Adams ME, Crimmins EM, Lin FR, Ailshire JA. Association between hearing aid use and mortality in adults with hearing loss in the USA: a mortality follow-up study of a cross-sectional cohort. The Lancet Healthy Longevity. 2024;5(1):e66-e75. — doi:10.1016/S2666-7568(23)00232-5
16. Francis L, Seshadri S, Dillard LK, Kujawa SG, Welling DB, Alcabes RL, Beiser AS. Self-reported hearing aid use and risk of incident dementia. JAMA Neurology. 2025;82(11):1195-1197. — doi:10.1001/jamaneurol.2025.2713

PubMed Topic Searches

These links open live PubMed searches for the listed keywords — results update as new studies are indexed.

1. Over-the-counter hearing aids — PubMed search
2. Hearing aids and cognitive decline — PubMed search
3. Hearing aid outcomes in adults — PubMed search
4. Real-ear measurement and fitting — PubMed search
5. Hearing loss and dementia — PubMed search
6. Cochlear implant outcomes in adults — PubMed search
7. Hearing aid adoption and adherence — PubMed search

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Connections

• ENT
• Hearing Loss
• Tinnitus
• Sudden Sensorineural Hearing Loss
• Otosclerosis
• Acoustic Neuroma
• Ear Infections
• Ménière's Disease
• Cholesteatoma
• Alzheimer's Disease
• Stroke
• Depression
• Diabetes
• Hypertension
• All Conditions

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