Hearing loss affects approximately 3.6 million Australians, according to the Australian Institute of Health and Welfare. That figure is projected to rise to more than 7 million by 2050 as the population ages. Yet not all hearing loss shares the same cause, mechanism, or treatment path. The three main types of hearing loss, sensorineural, conductive, and mixed, each involve different structures in the ear and require different clinical approaches. Recognising which type you have is the first step toward effective management. This article explains each type in detail, including causes, symptoms, treatment options, and the degrees of severity that audiologists use to measure hearing ability.
Sensorineural Hearing Loss
Sensorineural hearing loss is the most common type, accounting for roughly 90 per cent of all cases reported by Hearing Australia. It occurs when the delicate hair cells inside the cochlea become damaged or when the auditory nerve that carries signals from the inner ear to the brain is impaired. These hair cells do not regenerate once destroyed, which means sensorineural hearing loss is typically permanent. Understanding the causes and symptoms helps with early detection, which preserves more of your natural hearing.
Causes of Sensorineural Hearing Loss
Ageing is the leading cause. Presbycusis, or age-related hearing loss, begins gradually after age 50 and affects the higher frequencies first. The hair cells at the base of the cochlea, which detect high-pitched sounds, deteriorate over time. Noise exposure ranks as the second most common cause. Prolonged exposure to sounds above 85 decibels, or a single intense blast such as an explosion, can destroy hair cells instantly. Occupations in construction, manufacturing, and live music carry elevated risk. Ototoxic medications, including certain antibiotics, chemotherapy agents like cisplatin, and high-dose aspirin, can also damage the inner ear. Less common causes include Meniere's disease, acoustic neuroma, autoimmune inner ear disease, and viral infections such as measles or mumps. Genetic factors play a role as well, with some inherited conditions causing progressive sensorineural loss from birth or early childhood.
Symptoms of Sensorineural Hearing Loss
Sensorineural hearing loss typically develops gradually. Speech sounds muffled rather than quiet, because the loss disproportionately affects high-frequency consonant sounds that give words their clarity. You may struggle to follow conversations in noisy restaurants, frequently ask people to repeat themselves, or notice that women's and children's voices are harder to hear. Many people with this type of loss also experience tinnitus, a persistent ringing, buzzing, or hissing in the ears. Sounds may seem distorted even at comfortable volumes, and loud noises can become physically uncomfortable due to a phenomenon called recruitment, where damaged hair cells cause an abnormal growth in perceived loudness.
Treatment Options for Sensorineural Hearing Loss
Because the damage is permanent, treatment focuses on amplification and management rather than reversal. Hearing aids are the primary treatment for most cases. Modern digital hearing aids can be precisely programmed to amplify the specific frequencies you have lost while leaving other frequencies untouched. For severe to profound sensorineural loss where hearing aids provide insufficient benefit, cochlear implants bypass the damaged hair cells entirely and stimulate the auditory nerve directly. Assistive listening devices, such as FM systems and telephone amplifiers, supplement hearing aids in challenging listening environments. Auditory rehabilitation and communication strategies also play an important role in helping people adapt to their changed hearing. A comprehensive hearing test is essential to determine the degree and configuration of loss before any treatment decisions are made.
Conductive Hearing Loss
Conductive hearing loss occurs when sound waves cannot pass efficiently through the outer ear, ear canal, or middle ear to reach the cochlea. Unlike sensorineural loss, conductive hearing loss involves a mechanical problem rather than nerve damage. This distinction matters because many forms of conductive loss are treatable, and some can be fully resolved with appropriate medical intervention.
Causes of Conductive Hearing Loss
Earwax impaction is one of the most common causes. When cerumen builds up and hardens in the ear canal, it creates a physical barrier that blocks sound from reaching the eardrum. Middle ear infections, known as otitis media, cause fluid to accumulate behind the eardrum, restricting its ability to vibrate. This is particularly common in children but affects adults as well. A perforated eardrum from trauma, infection, or sudden pressure changes disrupts the transmission of sound to the middle ear bones. Otosclerosis, a condition where abnormal bone growth fuses the stapes bone in the middle ear, prevents proper vibration and creates a progressive conductive loss. Other causes include foreign objects lodged in the ear canal, congenital malformations of the outer or middle ear structures, and cholesteatoma, an abnormal skin growth that develops behind the eardrum and can erode middle ear bones.
Symptoms of Conductive Hearing Loss
Conductive hearing loss typically causes an overall reduction in volume rather than the clarity problems associated with sensorineural loss. Sounds seem quiet rather than distorted. You may notice that your own voice sounds hollow or that you can hear better in noisy environments, because background noise often provides sufficient volume to overcome the conductive blockage. A feeling of fullness or pressure in the affected ear is common, particularly with earwax impaction or middle ear fluid. Pain or discomfort may accompany infections or physical blockages. Because the inner ear and auditory nerve remain intact, speech understanding remains good once sounds are made loud enough to pass through the obstruction.
Treatment Options for Conductive Hearing Loss
Treatment targets the underlying obstruction or damage. Earwax removal by an audiologist or GP resolves impaction-related loss immediately. Middle ear infections are treated with antibiotics or, in chronic cases, with surgical insertion of ventilation tubes (grommets) to drain fluid and equalise pressure. Perforated eardrums often heal on their own, but large or persistent perforations may require a surgical patch called a tympanoplasty. Otosclerosis can be treated with a procedure called a stapedotomy, where the fused bone is replaced with a prosthetic that restores vibration. Congenital malformations may be addressed with reconstructive surgery or bone-anchored hearing devices. Where medical or surgical treatment is not appropriate, conventional hearing aids can compensate for the reduction in volume by amplifying sounds before they reach the obstruction.
Mixed Hearing Loss
Mixed hearing loss is exactly what its name suggests: a combination of both sensorineural and conductive hearing loss in the same ear. This means there is damage or dysfunction in the outer or middle ear as well as the inner ear or auditory nerve. Understanding mixed hearing loss is important because the treatment approach must address both components.
Causes of Mixed Hearing Loss
Mixed hearing loss often develops when a person with existing sensorineural loss, such as age-related deterioration, then develops a conductive problem on top of it. For example, an older adult with presbycusis who develops a middle ear infection will experience a sudden worsening of hearing beyond what their existing sensorineural loss alone would cause. Long-standing conductive conditions can also contribute. Chronic otitis media that persists over years may eventually cause inflammatory damage to the cochlea, adding a sensorineural component to what started as a purely conductive problem. Trauma to the ear or head can damage both the middle ear structures and the inner ear simultaneously, producing mixed loss from the outset. Otosclerosis, while primarily a conductive condition, can in advanced cases extend into the cochlea and cause additional sensorineural damage.
Symptoms of Mixed Hearing Loss
The symptoms of mixed hearing loss reflect both components. Volume is reduced due to the conductive element, and clarity is diminished due to the sensorineural element. Conversations become difficult even in relatively quiet settings. You may experience a combination of the fullness and pressure characteristic of conductive loss alongside the tinnitus and sound distortion associated with sensorineural damage. The overall hearing ability is typically worse than either type alone would produce, because the two components compound each other.
Treatment Options for Mixed Hearing Loss
Treatment for mixed hearing loss addresses both components, though often in stages. The conductive component is usually treated first, because resolving any reversible blockage or damage can improve overall hearing before the permanent sensorineural component is managed. This might involve treating an infection, removing wax, or performing surgery. Once the conductive element is optimised, the remaining sensorineural loss is managed with hearing aids or, in severe cases, cochlear implants. The audiologist must account for both components when programming hearing aid settings, because the amplification needs differ from those of pure sensorineural loss. Regular monitoring is important, as changes in either component can alter your hearing profile over time.
Degree of Hearing Loss
Audiologists classify hearing loss by severity using decibel thresholds measured during a pure-tone audiometry test. The results are plotted on an audiogram, which shows the softest sounds you can hear at different frequencies. These thresholds determine the degree of hearing loss and guide treatment recommendations.
Mild hearing loss (26 to 40 dB): You may have difficulty hearing soft sounds and following conversations in noisy environments. Speech sounds clear in quiet settings but becomes problematic when background noise is present. Many people with mild loss do not realise they have a hearing problem until a test confirms it.
Moderate hearing loss (41 to 55 dB): Conversational speech at normal volume is difficult to follow without amplification. You likely need the television turned higher than others prefer and regularly ask people to repeat themselves. Hearing aids are typically recommended at this level.
Moderately severe hearing loss (56 to 70 dB): Normal conversational speech is largely inaudible without hearing aids. Even in quiet environments, you struggle to follow what is being said. Group conversations become very challenging.
Severe hearing loss (71 to 90 dB): Without hearing aids, you cannot hear normal speech at all. Loud sounds such as a passing truck or a barking dog may still be audible. Powerful hearing aids or cochlear implants are usually necessary at this stage.
Profound hearing loss (91 dB and above): Even very loud sounds may not be heard without amplification. Communication relies heavily on lip reading, sign language, or cochlear implants. At this level, standard hearing aids are often insufficient, and cochlear implantation becomes the primary treatment consideration.
When to Seek Professional Help
Certain signs indicate it is time to book a professional hearing assessment. If you regularly struggle to follow conversations, especially in noisy places, or if family members have noticed you are not hearing as well as you used to, these are clear indicators. Sudden hearing loss in one ear is a medical emergency that requires evaluation within 48 hours to maximise the chance of recovery. Persistent ringing or buzzing in the ears warrants investigation, as tinnitus frequently accompanies hearing loss. A feeling of fullness or blockage that does not resolve within a few days should also be checked. Adults over 50 should have their hearing tested every one to three years even without symptoms, because gradual loss often goes unnoticed until it becomes significant.
A qualified audiologist at one of our Melbourne locations can determine which type of hearing loss you have and recommend the most effective course of action. The assessment is painless, takes around 30 minutes, and provides a detailed picture of your hearing health across all frequencies. Early diagnosis means more treatment options and better long-term outcomes, regardless of which type of hearing loss is involved.
Frequently Asked Questions
What is the most common type of hearing loss?
Sensorineural hearing loss is the most common type, accounting for roughly 90 per cent of all hearing loss cases. It involves damage to the hair cells in the cochlea or the auditory nerve and is typically caused by ageing, noise exposure, or certain medications.
Can conductive hearing loss be cured?
Many cases of conductive hearing loss can be treated effectively because the condition involves the outer or middle ear rather than permanent nerve damage. Treatment options include medication for infections, surgical repair of damaged structures, or removal of earwax blockages. The prognosis depends on the underlying cause.
What is the difference between sensorineural and conductive hearing loss?
Sensorineural hearing loss results from damage to the inner ear hair cells or auditory nerve and is usually permanent. Conductive hearing loss occurs when sound cannot pass efficiently through the outer or middle ear and is often treatable with medication or surgery. A comprehensive hearing test can distinguish between the two.
What degree of hearing loss requires a hearing aid?
Hearing aids are typically recommended for moderate hearing loss and above, though some people with mild loss also benefit. The decision depends on how much the hearing loss affects daily communication and lifestyle. An audiologist can determine the appropriate level of amplification during a comprehensive hearing test.
Works Cited
Australian Institute of Health and Welfare. "Ear and Hearing Health." AIHW, Australian Government, 2024, aihw.gov.au/reports/australias-health/hearing-health.
Hearing Australia. "Types of Hearing Loss." Australian Government, 2024, hearing.com.au.
Clark, J. G. "Uses and Abuses of Hearing Loss Classification." American Speech-Language-Hearing Association, vol. 23, no. 7, 1981, pp. 493-500.
Gelfand, S. A. Essentials of Audiology. 4th ed., Thieme, 2016.
National Institute on Deafness and Other Communication Disorders. "Types of Hearing Loss." U.S. Department of Health and Human Services, 2024, nidcd.nih.gov/health/types-hearing-loss.