When one hearing aid sounds louder than the other, the most common cause is a physical blockage, usually earwax or moisture clogging the speaker, tubing, or wax guard on the quieter side. But the issue can also come from a poor fit, a software glitch, internal hardware wear, or, less commonly, an actual change in your hearing. Most of these causes are fixable at home or with a quick visit to your audiologist.
Earwax and Moisture Blockages
This is the first thing to check because it’s the most frequent culprit. Every hearing aid has a wax guard, a tiny filter that sits between the speaker and your ear canal. Its job is to stop earwax and moisture from reaching the electronics inside. When that filter gets even partially clogged, sound becomes muffled or noticeably quieter on that side. A full clog can make the hearing aid seem almost dead.
Most people produce more wax in one ear than the other, which is why the problem tends to show up on just one side. Moisture from sweat or humidity can compound the issue. Even partial buildup reduces clarity and volume before you can see anything obviously wrong with the device. If wax or moisture gets past the guard entirely, it can reach the receiver and cause permanent damage.
The fix is straightforward: replace the wax guard. Most hearing aids come with a small pack of replacement guards and a tool to swap them. If you haven’t replaced yours recently, start here. It solves the problem more often than any other single step.
Clogged Microphone Ports
The microphone opening is a tiny pinhole on the outer surface of the hearing aid. Dust, skin oils, and debris can accumulate over it, reducing the amount of sound the device picks up. Because the microphone is so small, even a thin film of buildup can cut volume noticeably. Use the small brush that came with your hearing aids (or a soft, dry toothbrush) to gently sweep across the microphone ports on both devices. Do this daily, and you’ll often prevent the problem before it starts.
Dome Fit and Seal Problems
The silicone dome at the tip of your hearing aid creates a seal inside your ear canal, and the quality of that seal directly affects how loud the device sounds. If the dome on one side has shifted, shrunk, or lost its elasticity, it won’t hold sound in the canal the way it should. Amplified sound leaks out, making that ear seem quieter.
A dome that’s too small can also slip deeper into the canal or fall out entirely. A dome that’s too large creates pressure and discomfort, which your brain can interpret as distortion rather than volume. Worn-out dome material is a common issue people overlook. Silicone domes break down over time, becoming stiffer or developing tiny cracks. If your domes are more than two to three months old, try replacing them and see if the volume difference disappears.
Dome type matters too. Open domes let the most natural sound in but provide the least amplification. Closed and power domes create a tighter seal, delivering more volume across all frequencies. If someone accidentally put an open dome on one side and a closed dome on the other (it happens), the difference would be obvious.
Volume and App Settings
If your hearing aids connect to a smartphone app, check whether the volume on each side is set to the same level. Most apps let you adjust the left and right ears independently, and it’s easy to nudge one side down without realizing it. Look for a balance or individual volume slider and make sure both are matched, or reset them to the default.
Some hearing aids also have a physical volume control, a small button or rocker switch on the device itself. Brushing against it while inserting the hearing aid or taking off a hat can accidentally lower the volume on one side. If your device has this feature, press the volume up button a few times on the quieter aid and see if that resolves it.
Feedback Cancellation Reducing Volume
Modern hearing aids use software to detect and suppress feedback, that high-pitched whistling sound that happens when amplified sound loops back into the microphone. The system works by reducing amplification at specific frequencies where it detects the loop. The problem is that these algorithms aren’t perfect. If the dome isn’t sealing well or if you’re in an environment with sustained tones (like music), the feedback canceller can become overly aggressive, cutting gain at frequencies that aren’t actually feeding back. The result is one aid that sounds noticeably quieter or thinner than the other, even though nothing is physically wrong with it.
If you notice the volume drop happens mainly in certain environments or while listening to music, feedback suppression is a likely suspect. Your audiologist can adjust how aggressively the algorithm works, or you can try reseating the dome to improve the seal, which reduces the feedback that triggers the system in the first place.
Internal Hardware Wear
Hearing aid components degrade over time. The receiver (the tiny speaker inside the device) can weaken after years of daily use, producing less output even when everything else checks out. Internal circuitry can also develop faults that reduce gain gradually enough that you don’t notice until one side is clearly lagging behind the other.
If you’ve replaced the wax guard, cleaned the microphone, checked the dome, and verified your app settings, and the volume difference persists, the hardware itself may need attention. An audiologist can run a frequency and gain curve, essentially a performance test that maps the hearing aid’s actual output against what it was producing when first programmed. Comparing the two curves shows exactly where the device has lost power. A weak receiver can usually be replaced without buying a new hearing aid.
A Change in Your Hearing
Sometimes the hearing aid isn’t the problem. Your hearing in one ear may have changed, making the same level of amplification feel insufficient on that side. This is especially important to consider if the volume difference appeared suddenly.
Sudden sensorineural hearing loss is a rapid drop in hearing, typically in one ear, that develops all at once or over a few days. It’s defined clinically as a loss of at least 30 decibels across three connected frequencies within 72 hours. People often notice a feeling of fullness in the affected ear, sometimes with ringing or dizziness. The National Institute on Deafness and Other Communication Disorders classifies this as a medical emergency because early treatment (usually within the first two weeks) significantly improves outcomes. If your hearing aid suddenly sounds quieter on one side and you also notice ear fullness, new tinnitus, or dizziness, get to a doctor that day rather than troubleshooting the device.
More gradual hearing changes are common too, especially as you age. If one ear declines faster than the other, a previously well-balanced pair of hearing aids will start to feel uneven. A new hearing test and reprogramming will bring things back into balance.
A Daily Cleaning Routine Prevents Most Issues
A quick daily cleaning takes about a minute and prevents the majority of volume problems. Each night when you remove your hearing aids, brush the microphone ports, wipe down the surface with a dry cloth, and inspect the wax guard. Replace the guard whenever you see discoloration or buildup, and swap in fresh domes every two to three months or sooner if the silicone feels stiff. Leave the battery door open overnight (or place rechargeable aids in their case) to let moisture escape.
Even with consistent home care, professional cleaning every six months catches buildup in areas you can’t easily reach and gives your audiologist a chance to run a performance check on both devices. That baseline comparison is the fastest way to catch a slowly failing component before the volume gap becomes obvious.