OTC vs Prescription Hearing Aids: What Sets Them Apart
Nobody wakes up one Tuesday unable to hear. Age-related hearing loss arrives slowly enough that the person living with it is often the last one in the room to notice — the television creeps up a notch, then another, and the phone becomes the hardest conversation of the day. Somewhere on that slope, the question of a hearing aid comes up. There are now two different ways to answer it.
Over-the-counter hearing aids, the NIDCD says, can be bought directly, without visiting a hearing health professional. They are intended for adults with perceived mild to moderate hearing loss. Prescription hearing aids come from a hearing health professional who programs them for a person’s degree of loss, and may be necessary for more significant or complicated hearing loss.
How age-related hearing loss tends to show up
The National Institute on Aging calls age-related hearing loss presbycusis, and describes it as coming on gradually as a person grows older. It seems to run in families. The NIA says it may occur because of changes in the inner ear and in the auditory nerve, which carries signals from the ear to the brain.
Two details in that description do most of the work. Presbycusis usually occurs in both ears, affecting them equally. And because the loss is gradual, the NIA notes that people with presbycusis may not realize they have lost some of their ability to hear.
That is the quiet part. There is no single day when hearing fails, so there is no obvious moment that prompts the question.
Hearing loss comes in many forms, the NIA says, ranging from a mild loss in which a person misses certain high-pitched sounds all the way to a total loss of hearing. About one-third of older adults have hearing loss, and the chance of developing it increases with age.
In an ordinary week, according to the NIA, that means trouble having conversations with friends and family. It can also mean difficulty understanding a doctor’s advice, responding to warnings, and hearing doorbells and alarms. Presbycusis may also make it hard for a person to tolerate loud sounds, or to understand what others are saying.
Tinnitus often travels alongside all of this. The NIA describes it as typically a ringing in the ears, though it can also sound like roaring, clicking, hissing, or buzzing — one ear or both, loud or soft, coming and going. It is sometimes the first sign of hearing loss in older adults.
One line from the NIA is worth keeping straight: tinnitus is a symptom, not a disease. A piece of earwax blocking the ear canal can cause it. So can other health conditions, such as high blood pressure or allergies, and certain medications list it as a side effect.
Not everything under the heading of hearing loss is gradual. The NIA describes sudden deafness, also known as sudden sensorineural hearing loss, as an unexplained rapid loss of hearing that can happen all at once or over a few days, and says it should be considered a medical emergency. That is a different situation from presbycusis, and the NIA treats it differently.
What the NIH describes as common causes
The NIA opens with a short list: loud noise, aging, disease, and genetic variations. Loud noise is one of the most common. Noise from lawn mowers, snow blowers, or loud music can damage the inner ear and result in permanent hearing loss, and the NIA says loud noise also contributes to tinnitus.
Blockage is a separate mechanism. Earwax or fluid buildup can cause hearing loss by blocking sounds carried from the eardrum to the inner ear. A ruptured eardrum will do it too, and the NIA lists infection, pressure, and putting objects in the ear — cotton-tipped swabs included — as ways the eardrum gets damaged.
Then there is the body’s general health. Conditions common in older people, such as diabetes or high blood pressure, can contribute to hearing loss, the NIA says. So can ear infections caused by viruses and bacteria, also known as otitis media, along with a heart condition, stroke, brain injury, or a tumor.
Medications belong on the list. The NIA describes certain drugs as able to damage the inner ear, sometimes permanently, and names the categories: drugs used to treat serious infections, cancer, or heart disease, some antibiotics, and even aspirin at some dosages.
Genetics rounds it out. Not all inherited forms of hearing loss are evident at birth, the NIA notes, and it offers otosclerosis as one that can show up later in life — thought to be hereditary, involving abnormal bone growth that prevents structures within the ear from working properly.
The NIDCD approaches the same territory from the device side. Hearing aids, it says, are primarily useful for improving hearing and speech comprehension in people whose hearing loss results from damage to the small sensory cells in the inner ear, called hair cells. That type is sensorineural hearing loss, and the damage can come from disease, aging, or injury from noise or certain medicines.
Over-the-counter hearing aids: who the sources describe them for
Over-the-counter hearing aids are a category people can buy directly, the NIDCD says, without visiting a hearing health professional for an examination. They are intended, in the NIDCD’s words, to help adults with perceived mild to moderate hearing loss.
The word doing the heavy lifting there is perceived. The judgment about the degree of loss sits with the person buying, not with a measurement someone else took.
The NIA frames the same fork more plainly: there are two main ways to get a hearing aid, by prescription or over the counter.
Whichever way one arrives, the machine underneath is the same idea. The NIDCD describes a hearing aid as a small electronic device worn in or behind the ear, with three basic parts — a microphone, an amplifier, and a speaker. The microphone converts sound waves to electrical signals, the amplifier increases their power, and the speaker sends them into the ear.
A hearing aid magnifies sound vibrations entering the ear so that surviving hair cells can detect the larger vibrations and pass neural signals to the brain. The NIDCD states the ceiling on that plainly: a hearing aid will not restore normal hearing.
One more number from the NIDCD is hard to read past. Only about one out of five people who would benefit from a hearing aid actually uses one.
Prescription hearing aids and the professional who programs them
Prescription hearing aids, the NIDCD says, are available from a hearing health professional who will program them for a person’s degree of hearing loss. That single clause — programs them for your degree of hearing loss — is the whole difference in miniature.
The NIDCD spells out what the programming involves. Analog/adjustable aids are custom built for each user and programmed by the manufacturer according to specifications the audiologist recommends. Analog/programmable aids have more than one setting, which an audiologist can program using a computer for different listening environments.
Digital aids convert sound waves into numerical codes before amplifying them. Because the code carries information about a sound’s pitch and loudness, the NIDCD says the aid can be programmed to amplify some frequencies more than others, and can be set to focus on sounds coming from a specific direction. Digital circuitry gives an audiologist more flexibility.
Degree of loss also shapes the physical style. Behind-the-ear aids are used for mild to profound hearing loss, the NIDCD says, in-the-ear aids for mild to severe loss, and canal aids for mild to moderately severe loss. Canal aids are usually not recommended for people with severe to profound loss, because their reduced size limits their power and volume.
When there is hearing loss in both ears, the NIDCD adds, two hearing aids are generally recommended. Two provide a more natural signal to the brain and help with understanding speech and locating where a sound is coming from.
As for who the professional is, the NIA describes the path: a family doctor may be able to diagnose and treat a hearing problem, or may refer a person to an otolaryngologist — an ear, nose, and throat doctor — or to an audiologist, the health professional who can identify and measure hearing loss.
Measure is the operative verb. The NIA also describes seeking professional advice as the most important thing a person who suspects a hearing problem can do.
What the distinction actually separates
Read the two source descriptions side by side and the dividing line is not really about the hardware. It is about who determines the degree of loss, and who sets the amplification to match it.
Over the counter: bought directly, no examination, aimed at perceived mild to moderate loss. Prescription: obtained from a hearing health professional, programmed to a measured degree of loss, and — in the NIDCD’s phrasing — prescription hearing aids or other devices may be necessary for more significant or complicated hearing loss.
That word necessary is the one I would not skim past. It does not describe a nicer product. It describes a situation where the other route may not reach.
The NIDCD gives the physical reason underneath. The greater the damage to a person’s hair cells, the more severe the hearing loss, and the greater the amplification needed to make up the difference. There are practical limits to how much amplification a hearing aid can provide. If the inner ear is too damaged, even large vibrations will not be converted into neural signals — in which case, the NIDCD says, a hearing aid would be ineffective.
Amplification is not the whole story. The NIA describes many types of assistive devices for people with hearing loss: alert systems that work with doorbells, smoke detectors, and alarm clocks to send visual signals or vibrations, and devices using keyboards, touch screens, or text-to-speech technology.
Honestly, the most useful thing in both of these government pages is not the comparison at all. It is the reminder that presbycusis is gradual, both-eared, and easy to miss from the inside — which means the question of which category of device fits arrives later than the loss does.
Where a particular person’s hearing falls on that line is a measurement. A qualified hearing health professional is the one who takes it.
This article is general information, not professional advice. For decisions about your money or health, consult a qualified professional.