A Complete Guide to Hearing Loss

What is hearing loss?

Hearing loss is a partial or total reduction in the ability to hear sound in one or both ears. It can range from missing soft consonants in conversation to hearing very little environmental sound. Some people are born with hearing loss, others acquire it through aging, noise, illness, injury, medication, or changes within the ear. Depending on the cause, it may be temporary or permanent, sudden or gradual.

The path from sound to meaning is longer than it seems. Sound must travel through the outer and middle ear, become an electrical signal in the inner ear, move along the auditory nerve, and be interpreted by the brain. Hearing loss can begin at any point along that path. The location of the disruption helps determine its type and the treatments most likely to help.

Is hearing loss common?

Yes. The National Institute on Deafness and Other Communication Disorders reports that about 15% of American adults (37.5 million people) say they have some trouble hearing. Standard hearing examinations find bilateral hearing loss in about 1 in 8 people age 12 or older. And age remains the strongest predictor: hearing loss affects an estimated 22% of adults ages 65-74 and 55% of those 75 and older.

Common does not mean inevitable, and it does not mean you should simply put up with it. A hearing evaluation can separate a treatable blockage or middle-ear problem from a permanent inner-ear change.

“15% of American adults say they have some trouble hearing. Standard hearing examinations find bilateral hearing loss in about 1 in 8 people age 12 or older.”

Types of hearing loss

The type of hearing loss tells you where the hearing pathway is having trouble. That is different from severity, which tells you how much hearing has changed. A person can have mild or profound loss within more than one type.

Conductive hearing loss

The outer and middle ear normally collect sound and carry it inward. With conductive hearing loss, that movement becomes restricted, so less sound reaches the inner ear. The effect can resemble hearing someone speak from behind a closed door: the voice is still present, but it sounds quieter and muffled.

Sensorineural hearing loss

Tiny sensory hair cells in the inner ear convert sound vibrations into signals the brain can interpret. When some of these cells become damaged, the ear may lose information at particular frequencies. Turning up the volume can make speech louder without restoring the missing details. It can feel like listening to a recording with small pieces missing: you hear the voice, but certain consonants disappear and similar words become harder to distinguish.

Mixed hearing loss

Mixed hearing loss affects two stages of the hearing process. The outer or middle ear does not transmit sound efficiently, while damage in the inner ear or auditory nerve reduces the detail in the signal sent to the brain. This can affect volume and clarity at the same time. It may feel like listening to a recording that is playing too softly while some of its details are also missing. 

Central hearing loss

The ears may detect and transmit sound normally, but the brain has difficulty organizing or interpreting the information it receives. This challenge can become more noticeable when several sounds compete at once. It may feel like trying to follow one conversation in a crowded room.

What are hearing loss symptoms and signs?

Hearing loss often appears as extra listening effort before it feels like a noticeable loss of sound. You may hear someone speaking but find that their words lack clarity, especially when several people are talking or background noise competes with the conversation.

Common signs of hearing loss may include:

• Frequently asking people to repeat themselves.
• Struggling to follow conversations in restaurants, meetings, or group settings.
• Increasing the volume on the television, phone, or other devices.
• Relying more heavily on facial expressions or lip movements.
• Missing high-pitched sounds, such as birdsong, doorbells, or certain speech sounds.
• Feeling tired after conversations because listening requires more concentration.
• Experiencing tinnitus, ear pressure, dizziness alongside hearing changes.

These symptoms can develop gradually and may affect people differently. A hearing evaluation can determine whether they relate to hearing loss and identify the appropriate next steps.

What usually causes hearing loss?

Hearing loss can develop for many reasons, including aging, repeated exposure to loud sounds, certain health conditions, genetics, illness, injury, and some medications. The cause can affect whether hearing loss is temporary or permanent and which treatments may help. 

Age-related hearing loss

Age-related hearing loss, also called presbycusis, usually develops gradually and affects both ears. Aging is often the main factor, but genetics, long-term noise exposure, certain health conditions, and some medications may also contribute. Because the change is gradual, family members often notice the subtle signs of hearing loss  before a listener does.

Health conditions

Some health conditions may increase the likelihood of hearing loss. The NIDCD notes that high blood pressure and diabetes are associated with hearing loss. Having one of these conditions does not necessarily mean that hearing loss will develop, but regular hearing checks can help identify changes over time. 

Noise-induced hearing loss

A single explosive sound can injure hearing, but repeated exposure often does the damage quietly: years of machinery, concerts, power tools, motorcycles, or headphones played too loudly. Unlike most age-related loss, noise-induced hearing loss is largely preventable. The risk depends on both loudness and time, higher volume means less safe exposure time.

Auditory neuropathy

Auditory neuropathy can cause hearing loss by disrupting how sound signals travel from the inner ear to the brain. The ear may detect sound normally, but the signals arrive incomplete or out of sync, making them harder for the brain to interpret. As a result, a person may hear that someone is speaking while struggling to understand the words, particularly in background noise. An audiologist can use specialized testing to identify this pattern and recommend appropriate support. 

What are the complications of hearing loss?

Untreated hearing loss can shrink a life by degrees: one skipped dinner, one abandoned book club, one conversation handed over to a spouse. Research has linked hearing loss with social isolation, depression, cognitive decline, and falls. These are associations, not proof that hearing loss directly causes each outcome. Still, they matter because hearing supports communication, awareness, and participation. 

The World Health Organization links hearing loss with social isolation and cognitive effects. Hearing difficulty may also make medical communication harder: the NIDCD notes that people may struggle to follow a doctor’s advice or respond to warnings. Hearing support, written instructions, and clear communication can help make these conversations easier to follow.

The encouraging news is that hearing loss is one of the most treatable conditions associated with aging. Depending on its type and cause, treatment may include medical care, hearing aids, cochlear implants, assistive listening devices, or communication strategies. These options do not restore normal hearing in every case, but they can make sound and conversation more accessible, supporting social connection, cognitive well-being, and better mobility.

How is hearing loss diagnosed?

A hearing diagnosis is more than a beep test. A clinician begins with your history: when the change started, whether one or both ears are involved, which situations are difficult, and whether you have pain, tinnitus, dizziness, noise exposure, or medication risks. Each part of the evaluation answers a different question.

Optional first checks 

• Smartphone or app-based screening: A validated app can be a convenient first check, especially when care is not immediately available. Treat the result as a screening signal—not a clinical diagnosis—and follow up if it shows a concern.
• General screening tests: A brief office or community screening checks whether you should have a fuller assessment. It can identify risk, but it does not describe the complete type, severity, or treatment plan.

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Comprehensive hearing evaluation

• Physical exam: An audiologist looks in the ear for wax, infection, fluid, injury, or another visible cause. This step can reveal a conductive problem that needs medical treatment.
• Audiometer and middle-ear tests: In a sound-treated space, an audiologist measures the softest tones you hear across pitches and how well you recognize speech. Air- and bone-conduction results help locate the problem. Tympanometry evaluates eardrum movement, and other tests can assess inner-ear or nerve function.
• Speech-in-noise testing: A person may hear tones or recognize words clearly in a quiet test booth yet still struggle to follow conversation in a restaurant, meeting, or family gathering. Speech-in-noise testing measures real-world difficulty. An audiologist presents words or sentences with background noise, adjusts the relative levels of speech and noise, and asks the patient to repeat what they hear. This gives information that a standard audiogram may not capture and is particularly relevant when evaluating technology designed to improve speech clarity in background noise, including Fortell’s AI-powered approach.

How is hearing loss severity classified?

An audiogram plots the quietest sound you can hear at different pitches, measured in decibels hearing level. Audiologists use those thresholds to classify severity, commonly as: mild, moderate, severe, or profound, with some systems adding slight and moderately severe categories. This measurement is not the same as the type of hearing loss. 

The table below connects these clinical classifications with how they may appear in daily life. 

How can I prevent hearing loss?

You cannot prevent every form of hearing loss, and scientists do not yet know how to prevent age-related loss itself, but you can reduce avoidable risk and protect the hearing you have.

• Shorten the exposure: Loudness and time work together. Step outside for quiet breaks during concerts, events, or noisy projects.
• Use protection that fits: Earplugs or protective earmuffs help during loud work, motorsports, concerts, and power-tool use. 
• Check your hearing: A baseline test makes gradual change easier to spot, especially if you are regularly exposed to noise or already notice conversation becoming harder.
• Manage overall health: Diabetes and high blood pressure are associated with hearing loss. Follow your clinician's care plan, and ask whether any medication carries a hearing-related risk. Never stop a prescribed medication without medical guidance.

What are hearing loss treatments?

Treatment follows the cause, type, severity, and the situations you want to improve. A temporary blockage may need removal. An infection may need medical care. Permanent inner-ear loss may call for amplification or an implant. Many people benefit from a combination of technology, communication strategies, and ongoing professional support.

Hearing aids

For many people with sensorineural hearing loss, hearing aids offer the most common path to clearer, more accessible sound. They amplify and clarify sound, but they do not restore normal hearing. An audiologist can fit a prescription device to your audiogram and adjust it over time as your brain adapts and your needs change.

Newer AI-powered options can add another layer of support by helping patients to distinguish speech from competing background noise and find settings that work comfortably and confidently in the places where conversation matters most. To understand the microphone, processor, and speaker inside the device, read how hearing aids work.

Cochlear implants and other implantable devices

When hearing aids provide limited benefit for severe sensorineural hearing loss, a cochlear implant may offer another way to access sound. A surgeon places the device inside the ear, where it bypasses damaged structures and directly stimulates the auditory nerve. By contrast, a hearing aid sits in or behind the ear and amplifies sound through the wearer’s remaining hearing. Bone-conduction and middle-ear implants address different, more specific needs, and a specialist team determines who may benefit from each option.

Surgery

For some causes of conductive hearing loss, surgery can address the physical problem that prevents sound from moving normally through the ear. A surgeon may repair an eardrum, drain persistent middle-ear fluid, treat otosclerosis, or correct another structural issue. These procedures generally do not reverse the common sensorineural hearing loss associated with aging or long-term noise exposure. 

Why choose Fortell

Most hearing aids begin with the same raw material: a room full of sound. The difference lies in what happens next. Traditional hearing aids often rely on acoustic rules—frequency, timing, and volume—to estimate which sounds matter. That can help with steady noise, yet a lively restaurant is not steady. Competing voices rise and fall just like the person you want to hear.

Fortell approaches that problem with its AI hearing aid trained to separate speech from background noise using semantic sound and spatial processing to remove up to 98% of background noise and gain 50x clearer speech via a 17 dB improvement in signal-to-noise ratio. 

Fortell AI Hearing Aids are for prescription use by adults with hearing loss and available in the U.S. only.

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Up to 98% of background noise eliminated with Fortell

Hearing loss is a signal, not a surrender

Hearing loss is common, but no two experiences are interchangeable. The type tells you where the hearing pathway has changed. The severity describes how much sound you can detect. And a professional hearing evaluation can identify the hearing loss, clarify what may be causing it, and guide the next step.

Most importantly, hearing loss is highly treatable. Depending on the diagnosis, care may include medical treatment, surgery, hearing aids, or other forms of hearing support. For adults who benefit from prescription hearing aids, AI-driven technology can go beyond making sounds louder by helping speech stand out from background noise. Fortell brings this technology together with an audiologist-led evaluation, personalized fitting, and ongoing care to help restore clarity to conversation. When you are ready, book an appointment or explore Fortell locations to begin.