Causes of Hearing Loss: What Can Affect Your Hearing?

Hearing loss has many possible causes. Some are temporary and reversible. Others lead to permanent damage. Here's the catch: you can't tell which is which just by how your hearing feels. Symptoms overlap, and self-diagnosis is unreliable. A proper medical evaluation is the only way to know what's really going on — and what to do about it.

7 Common Causes of Hearing Loss

Hearing loss rarely has a single cause. More often, a few factors stack up over time. Here are the 7 most common causes of hearing loss, grouped by how serious they tend to be — and whether you can do something about them.

• Aging (presbycusis) — Common and gradual. Natural changes in the inner ear over time typically affect both ears.
• Loud noise exposure — Common and preventable. Repeated exposure to loud workplaces, concerts, or high-volume audio can cause cumulative, largely irreversible damage.
• Earwax blockage — Common and reversible. A buildup of earwax can temporarily block sound and is usually easy to treat. Professional removal often restores hearing.
• Ear infections (otitis media / externa) — Common and reversible. Inflammation or fluid buildup can interfere with sound conduction. Most cases improve with treatment, though repeated infections can sometimes cause lasting damage.
• Genetic factors — Variable. Some forms of hearing loss are present at birth, while others develop later. A family history can increase the risk.
• Head or ear injury — Potentially urgent. Trauma can damage the eardrum, middle ear bones, or inner ear and should be assessed promptly.
• Ototoxic medications — Sometimes preventable or reversible. Certain antibiotics, chemotherapy drugs, high-dose aspirin, and some diuretics can affect hearing, depending on the dose and duration. Talk to your doctor about potential hearing-related side effects.

Causes of Different Types of Hearing Loss

Doctors classify hearing loss based on which part of the ear is affected. Each type has different causes — and different treatment paths.

Conductive Hearing Loss Causes

Conductive hearing loss happens when something blocks sound from traveling through the outer or middle ear. Think of it as a mechanical problem — sound waves literally can't get where they need to go. Common causes include:

• Earwax impact blocking the ear canal
• Fluid in the middle ear from infection (otitis media)
• Perforated eardrum from injury or infection
• Otosclerosis — abnormal bone growth in the middle ear
• Foreign objects lodged in the ear canal (more common in children)

Most conductive hearing loss can be treated with medication or minor surgery.

Sensorineural Hearing Loss Causes

Sensorineural hearing loss is caused by damage to the inner ear (cochlea) or the auditory nerve. This is the most common type of permanent hearing loss.

• Age-related degeneration of hair cells in the cochlea
• Noise-induced damage from prolonged or sudden loud sound exposure
• Genetic conditions affecting inner ear development or function
• Ototoxic medications that harm cochlear structures
• Infections such as measles, mumps, or meningitis
• Meniere's disease, which affects inner ear fluid balance

Hearing aids help most people with sensorineural hearing loss. For more severe cases, cochlear implants may be an option.

Mixed Hearing Loss Causes

Mixed hearing loss is exactly what it sounds like — a combination of conductive and sensorineural hearing loss.

Mixed hearing loss can come from a few directions: age-related hearing loss plus an earwax blockage, chronic ear infections that damage both the middle and inner ear, or a head injury that takes out middle ear bones and the cochlea at once.

Treatment usually starts with the conductive piece — that's the part that might be reversible — while managing the sensorineural side with hearing devices.

Health Conditions That May Cause Hearing Loss

1. Excessive Earwax

Earwax (cerumen) is a normal, protective substance. Problems start when it builds up and hardens, eventually blocking the ear canal. That blockage can cause a sudden or gradual drop in hearing — usually in one ear — often paired with a stuffy, full sensation. This is one of the most common causes of hearing loss, and also one of the easiest to fix. A healthcare provider can remove impacted wax safely. Skip the cotton swabs — they tend to push wax deeper, making things worse.

2. Otitis

Otitis means inflammation or infection of the ear. With otitis media (middle ear infection), fluid builds up behind the eardrum and keeps it from vibrating normally — a classic case of conductive hearing loss. Otitis externa (swimmer's ear) affects the ear canal itself; swelling there can block sound from getting through. Most ear infections clear up with treatment, but infections that keep coming back or go untreated can cause permanent damage.

3. Tinnitus

Tinnitus — that persistent ringing, buzzing, or hissing you hear when no external sound is present — doesn't directly cause hearing loss, but the two go hand in hand. Tinnitus often signals underlying hearing damage, particularly from noise exposure or aging. If the ringing sticks around, get a hearing evaluation. It's the best way to check whether hearing loss is part of the picture.

4. Diabetes or Heart Disease

Both diabetes and heart disease can reduce blood flow to the inner ear. Diabetes can damage the tiny blood vessels and nerves that keep hearing working. Cardiovascular disease limits circulation, and the cochlea — the inner ear's sound-processing center — needs a steady oxygen supply to function. Controlling these conditions helps protect your hearing, though any hearing loss from vascular damage is usually permanent.

5. Ear Injury or Head Trauma

A direct hit to the ear, a skull fracture, or a sudden pressure change (barotrauma) can rupture the eardrum, knock middle ear bones out of place, or damage the inner ear. The resulting hearing loss can be conductive, sensorineural, or mixed — it depends on what got injured. Any hearing loss after a head injury needs urgent medical attention.

What Causes Sudden Hearing Loss?

Sudden sensorineural hearing loss (SSHL) is a rapid drop in hearing — most often in one ear — that happens within 72 hours or less. Doctors can't always pinpoint a cause, but suspected triggers include viral infections, blood flow problems in the inner ear, autoimmune reactions, or a tear in the cochlear membrane.

This is a medical emergency. Don't wait a few days to see if it clears up. Don't reach for over-the-counter hearing aids. Time matters — the sooner treatment starts, the better the odds of recovery. If your hearing drops suddenly, call a doctor or ENT specialist right away, or head to urgent care or the ER. Early corticosteroid treatment gives you the best shot at getting your hearing back.

FAQs

What can cause loss of hearing?

Aging, loud noise exposure, earwax buildup, ear infections, genetics, head injuries, certain medications, and health conditions like diabetes or heart disease can all cause hearing loss. Some causes are temporary (earwax is a classic example), while others, like age-related inner ear damage, are permanent.

Can hearing loss from earwax be temporary?

Yes. It's one of the few causes of hearing loss that's fully reversible. A quick in-office removal, and your hearing is back.

Do headphones or earbuds cause hearing loss?

They can — but the problem isn't the headphones. It's the volume and how long you listen. A good rule of thumb is 60/60: keep the volume at or below 60% and take a break after 60 minutes. Noise-canceling headphones help too, because you won't feel the need to crank up the volume to drown out background noise.

Does hearing loss cause dementia?

Hearing loss doesn't directly cause dementia, but research shows it's a significant risk factor for cognitive decline. Untreated hearing loss makes your brain work harder just to process sound — pulling resources away from memory and thinking — and it often leads to social withdrawal. Both of those are linked to faster cognitive decline. The flip side: studies suggest that using hearing aids may lower dementia risk.

What can cause unilateral hearing loss?

Hearing loss in one ear — what doctors call unilateral hearing loss — can have many of the same causes as hearing loss in both ears: earwax, an ear infection, a perforated eardrum. But it can also point to things that specifically affect one side, like Meniere's disease, head trauma on one side, or an acoustic neuroma (a non-cancerous tumor on the hearing nerve). Sudden one-sided hearing loss is a red flag — get it checked by a doctor right away.

Disclaimer: This article is for informational purposes only and does not constitute medical advice. If your hearing loss is sudden, in one ear, or comes with pain, dizziness, or drainage, see a doctor first. Sudden hearing loss is a medical emergency that needs prompt treatment. Hearing aids are regulated medical devices; OTC hearing aids are intended for adults 18 and older with perceived mild-to-moderate hearing loss.