What causes hearing loss?

Hearing loss can arise from many different sources, and pinpointing the cause matters because it shapes what may help. Broadly, causes fall into those affecting the inner ear or hearing nerve (sensorineural) and those affecting the outer or middle ear (conductive). Some are permanent, while others can be temporary and may improve once treated, which is a key reason not to simply put up with reduced hearing.

What are the most common causes?

• Ageing: natural changes in the inner ear over time, the most frequent cause overall.
• Noise exposure: loud workplaces, machinery, firearms, concerts or personal audio over many years.
• Earwax build-up: a common and usually reversible cause of muffled hearing.
• Ear infections and fluid: particularly in the middle ear.
• Genetics: a family tendency toward hearing loss.

Noise and ageing together account for a large share of the hearing loss seen in Australian adults, and their effects can quietly add up across a lifetime before you notice them. Because the change is often gradual, it is common for family members to remark on it before the person does.

What are some less obvious causes?

Beyond the everyday culprits, hearing can be affected by certain medications that are toxic to the ear (sometimes called ototoxic), head or ear injury, sudden changes in blood supply to the inner ear, and some illnesses. Occasionally hearing loss is present from birth or develops in childhood, which is why newborn and school screening exists in Australia. If you are concerned about how a medication or illness you have may relate to your hearing, your GP is best placed to advise.

Is the cause always permanent?

No, and this is an important distinction. Conductive causes such as earwax, middle-ear fluid or an infection are often temporary, and hearing frequently improves once they are addressed. Sensorineural causes such as ageing and noise damage are usually permanent, though they can very often be managed well with hearing technology and communication strategies. Because the same symptoms can come from very different underlying reasons, you cannot reliably tell from how it feels alone.

How is the cause worked out?

An audiologist builds a picture from several simple steps rather than guessing. This usually includes:

• A conversation about your history, noise exposure, medications and any family pattern.
• An examination of the ear canal and eardrum to check for wax, fluid or infection.
• A hearing test that maps the type and degree of any loss across different pitches.
• Additional checks, such as middle-ear pressure testing, where they add useful information.

Together these help separate a conductive cause from a sensorineural one, which guides what may help next.

Can hearing loss be prevented?

Not every cause is avoidable, but you can reduce some risks. Protecting your ears from loud noise with well-fitted earplugs or earmuffs, keeping the volume moderate on personal devices, giving your ears breaks from noise, and having wax managed safely all help. Because the same symptoms can come from very different causes, a professional assessment is the reliable way to understand what is happening in your ears. At Hearing Help in Newport Marketplace on the Redcliffe Peninsula, our audiologists examine your ears, carry out a hearing test, and explain the likely cause and any options that may suit you. If a medical cause is suspected, we will guide you toward your GP or a specialist. Sudden hearing loss should be checked promptly. Booking a hearing assessment needs no referral.