The main causes of hearing loss

Hearing loss happens when sound cannot travel normally through your ear to your brain. The cause depends on which part of your ear is damaged — the outer ear, the middle ear, the inner ear, or the nerve that carries sound signals to your brain.

Some causes are temporary and reversible, like earwax buildup or fluid behind the eardrum. Others are permanent, like damage to the tiny hair cells inside your inner ear or age-related changes in how your ear works. Many people experience hearing loss from more than one cause at the same time.

The most common causes fall into a few categories: aging, noise exposure, infection or disease, injury, and medication side effects. Understanding what damaged your hearing can help you and your doctor decide what to do next.

Key Takeaways

  • Age-related hearing loss is the most common type and usually affects both ears equally as you get older.
  • Loud noise exposure — whether sudden or over time — damages the hair cells in your inner ear and is often permanent.
  • Infections, fluid buildup, earwax, and eardrum damage can cause hearing loss that may improve with treatment.
  • Some medications and medical conditions can damage hearing, and stopping or changing the medication may help.
  • A hearing test can show which part of your ear is not working and help narrow down the cause.

Age-related hearing loss

As you get older, the hair cells in your inner ear naturally wear down and stop working as well. This type of hearing loss, called presbycusis, usually starts in your 60s or earlier if you have been around loud noise for many years. It affects both ears about equally and tends to make high-pitched sounds harder to hear first — like birds chirping, doorbells, or people's voices on the phone.

Age-related hearing loss happens slowly over years, so you may not notice it at first. Family members often spot it before you do — they notice you turn up the TV volume or ask people to repeat themselves more often. There is no way to stop this type of hearing loss, but hearing aids can help you hear better.

Noise exposure and loud sounds

Noise-induced hearing loss comes from exposure to loud sounds. This can happen in two ways: a single very loud event (like an explosion or gunshot) that damages your inner ear all at once, or years of exposure to loud noise at work or during hobbies.

Sounds louder than 85 decibels can damage hearing over time. For context, a lawn mower is about 90 decibels, a rock concert is 110 decibels, and a gunshot is 140 decibels. If you work around loud machinery, attend concerts regularly, or use power tools without ear protection, you are at risk. The damage usually happens to the hair cells in your inner ear and cannot be repaired, though hearing aids can help you hear again.

Protecting your ears when you know you will be around loud noise — using earplugs, earmuffs, or both — can prevent this type of hearing loss from getting worse.

Infections, fluid, and blockages

Several conditions in your middle ear can block sound from reaching your inner ear. Earwax buildup is the most common and easiest to treat — your doctor can remove it in the office, and your hearing usually returns right away. Fluid behind the eardrum (called otitis media with effusion) often happens after a cold or ear infection and usually clears on its own within a few weeks, though it can last longer in children.

Ear infections can cause temporary hearing loss while the infection is active. Most improve once the infection is treated with antibiotics or by letting it heal on its own. However, repeated ear infections or severe infections can sometimes scar the eardrum or the tiny bones in your middle ear, causing permanent hearing loss.

A perforated eardrum — a hole or tear in the membrane that vibrates to send sound deeper into your ear — can happen from infection, injury, or sudden pressure changes. Small perforations often heal on their own, but larger ones may need surgery to repair.

Inner ear damage and disease

Sudden sensorineural hearing loss means you lose hearing in one ear (or sometimes both) over hours or days. The cause is often unknown, but it can be linked to viral infection, blood vessel problems, or autoimmune disease. This type of hearing loss is a medical emergency — if you notice it, see a doctor right away, because treatment started early may help restore some hearing.

Meniere's disease affects the inner ear and causes hearing loss along with dizziness, ringing in the ears, and a feeling of fullness in the affected ear. The hearing loss can be temporary at first but may become permanent over time. Otosclerosis is a condition where bone grows abnormally in the middle ear, blocking sound from reaching the inner ear. It usually affects one ear first and can be treated with surgery or hearing aids.

Infections like measles, mumps, or meningitis can damage the inner ear and cause permanent hearing loss, especially in children. Congenital conditions — problems present from birth — can also affect how the inner ear develops and works.

Medications and medical conditions

Some medications can damage hearing as a side effect. Ototoxic medications — drugs that harm the inner ear — include certain antibiotics (like gentamicin), chemotherapy drugs, high-dose aspirin, and some diuretics (water pills). The hearing loss may be temporary and improve when you stop taking the medication, or it may be permanent. If you take any of these medications and notice hearing changes, tell your doctor right away.

Medical conditions can also cause hearing loss. Diabetes, high blood pressure, and heart disease can damage blood vessels in the inner ear. Thyroid problems, lupus, and other autoimmune diseases can affect hearing. Head injuries or trauma to the ear can damage the eardrum, the bones in your middle ear, or the inner ear itself.

Frequently Asked Questions

Can hearing loss from loud noise come back?

No. Noise-induced hearing loss is permanent because it damages the hair cells in your inner ear, and those cells do not regrow. However, hearing aids can help you hear sounds you have lost. Protecting your remaining hearing from further noise damage is important.

Is sudden hearing loss an emergency?

Yes. If you lose hearing in one or both ears over hours or days, see a doctor as soon as possible — ideally within two weeks. Early treatment with steroids or other medications may help restore some hearing, but waiting longer makes recovery less likely.

Can earwax cause permanent hearing loss?

No. Earwax buildup causes temporary hearing loss that goes away once the wax is removed. However, if earwax is left in place for a very long time, it can occasionally cause infection or damage to the eardrum, which could lead to permanent loss.

Do hearing aids work for all types of hearing loss?

Hearing aids work well for most types of hearing loss, but they work differently depending on the cause. For age-related or noise-induced loss, they amplify sound. For some conditions like otosclerosis, surgery may be an option. Your doctor can explain which treatments might help your specific type of hearing loss.

Can you get hearing loss from using earbuds?

Yes, if you use them at high volume for long periods. Earbuds deliver sound directly into your ear canal, so loud volumes can damage the hair cells in your inner ear the same way other loud noise does. Keeping volume at 60 percent or lower and taking breaks helps protect your hearing.