Conductive hearing loss is hearing loss caused by something blocking sound from reaching the inner ear. Unlike sensorineural hearing loss (which involves permanent inner-ear damage), conductive hearing loss is often fully treatable — and sometimes resolves dramatically once the underlying cause is addressed. This page is a focused guide to what causes it, how it’s diagnosed, and what treatment usually looks like.
What Is Conductive Hearing Loss?
Sound reaches the inner ear by traveling through three structures, in this order: the outer ear (the pinna and ear canal), the eardrum (tympanic membrane), and the middle ear (a small air-filled space containing three tiny bones — the malleus, incus, and stapes — that amplify and transmit vibration).
Anything that interferes with this mechanical pathway — a blockage, a perforation, fluid, fixation of one of the bones — produces conductive hearing loss. The inner ear itself (the cochlea and hearing nerve) is healthy; the signal just isn’t reaching it cleanly.
That distinction matters because it means most conductive hearing loss has a fixable cause. Once the obstruction or dysfunction is corrected, hearing typically returns.
Common Causes
Earwax (cerumen) impaction
The single most common cause we see, and the most rewarding to treat. Earwax is normal and protective in small amounts; it becomes a problem when it builds up enough to block the canal, which can happen gradually or suddenly. Patients often describe a feeling that “a curtain came down” in one ear. Professional removal — with proper tools and a microscope — usually resolves this in one visit. Cotton swabs make the problem worse, not better, by pushing wax deeper.
Middle-ear fluid (otitis media with effusion)
Common in children but possible in adults, especially after a cold, allergy flare, or air travel. The eustachian tube (which equalizes pressure between the middle ear and the back of the throat) stops functioning properly, fluid accumulates behind the eardrum, and sound transmission drops. Often resolves on its own; persistent cases may need medical management.
Perforated eardrum
A hole or tear in the tympanic membrane — from infection, sudden pressure change (diving, slap to the ear), or trauma. Small perforations often heal on their own; larger or chronic ones may require surgical repair (tympanoplasty).
Otosclerosis
Abnormal bone growth in the middle ear, most commonly affecting the stapes — the smallest bone in the body. The stapes becomes fixed, unable to vibrate freely, and conducts sound poorly. Otosclerosis runs in families, often appears in mid-adulthood, and can be treated either with hearing aids or with a surgical procedure called stapedectomy.
Ossicular discontinuity
The chain of three middle-ear bones gets disrupted — usually from head trauma or chronic infection. Treated surgically by an ENT, often with reconstruction of the chain.
Foreign body in the ear canal
Less common in adults than in children, but it happens — usually small objects, pieces of cotton swabs, or insects. Removed by a professional with the right tools; never attempt at home with anything sharp.
External ear canal narrowing or growth
Bony growths called exostoses (sometimes called “surfer’s ear” from cold-water exposure) or soft-tissue growths can narrow the canal enough to interfere with sound conduction. Diagnosed on otoscopic exam.
How It’s Diagnosed
Distinguishing conductive hearing loss from sensorineural hearing loss is one of the clearest things audiology testing can tell you. The diagnostic workup usually includes:
- Otoscopic exam — a direct look at the ear canal and eardrum to identify wax, perforation, fluid, or growths.
- Pure-tone audiometry by air and bone conduction. Air conduction tests how well sound travels through the entire pathway; bone conduction bypasses the outer and middle ear by vibrating the skull directly. A gap between these two thresholds (the “air-bone gap”) is the hallmark sign of conductive hearing loss.
- Tympanometry — a measure of how well the eardrum and middle-ear bones are moving in response to pressure changes. Useful for identifying fluid, perforations, or stiffness.
- Acoustic reflex testing — helps localize whether the problem is at the eardrum, the middle-ear bones, or further along.
These tests are painless and take 30–45 minutes combined.
Treatment Options
Treatment depends on the underlying cause. The good news: most conductive hearing loss can be addressed without hearing aids.
- For earwax — professional removal in our office, often a same-visit procedure with immediate hearing improvement.
- For middle-ear fluid — observation, decongestants, or referral to ENT for tubes if persistent.
- For perforated eardrum — observation if small; tympanoplasty surgery if large or chronic.
- For otosclerosis — either hearing aids (effective and non-invasive) or stapedectomy surgery (a small percentage of cases).
- For mixed conductive plus sensorineural — addressing the conductive component first, then fitting hearing aids for the residual sensorineural component.
When surgery is the right path, we coordinate with an ENT specialist and continue managing the audiologic follow-up. Many patients see complete restoration of hearing.
Why You Shouldn’t Wait to Get It Checked
Conductive hearing loss is often the easiest type of hearing loss to treat — but only if it’s diagnosed. Many people assume their hearing change is age-related (and untreatable) when in fact a 20-minute earwax removal would restore most of it. Others delay because the loss is mild and they’ve adapted, missing the chance to address an issue (like otosclerosis) that has surgical or medical solutions.
A diagnostic evaluation will tell you definitively which type of hearing loss you have and what your options actually are. From there, the path forward is usually clearer than you might expect.