Mixed Hearing Loss
A blend of conductive and sensorineural hearing loss
Quick Facts
- Type: Hearing (ear) disorder
- Combines: Conductive + sensorineural loss
- Affected areas: Outer/middle ear and inner ear/nerve
- Treatment: Depends on each component
Overview
Mixed hearing loss occurs when a person has both conductive and sensorineural hearing loss in the same ear at the same time. Conductive hearing loss involves a problem in the outer or middle ear that blocks sound from reaching the inner ear, while sensorineural hearing loss involves damage to the inner ear (cochlea) or the nerve that carries sound to the brain.
Because two different parts of the hearing system are affected, mixed hearing loss can cause more difficulty than either type alone. The good news is that the conductive part is often treatable, which can improve hearing even when the sensorineural part is permanent.
Symptoms
Symptoms combine features of both types of hearing loss:
- Sounds seem both quieter and less clear
- Difficulty understanding speech, especially in noisy settings
- A feeling of fullness or blockage in the ear (from the conductive part)
- Needing to turn up the volume on devices
- Sometimes ringing in the ear (tinnitus) or balance issues, depending on the cause
Sudden hearing loss, especially in one ear, is a warning sign and should be evaluated quickly.
Causes
Mixed hearing loss results from two sets of problems occurring together.
- Conductive component: Earwax blockage, fluid or infection in the middle ear, a perforated eardrum, or stiffening of the middle ear bones (otosclerosis).
- Sensorineural component: Aging, long-term noise exposure, certain medications, genetic factors, or inner ear and nerve conditions.
For example, someone with age-related inner ear loss who also develops a middle ear infection or earwax blockage can have mixed hearing loss.
Risk Factors
- Older age, which raises the risk of sensorineural loss
- Repeated or chronic ear infections
- Long-term exposure to loud noise
- Family history of hearing problems or otosclerosis
- Use of medications that can harm hearing
- Previous ear surgery or injury
Diagnosis
An audiologist or ear specialist evaluates the type and degree of hearing loss:
- Hearing tests (audiometry): Air- and bone-conduction testing distinguishes the conductive and sensorineural parts.
- Tympanometry: Checks middle ear function and pressure.
- Ear examination: Looks for wax, fluid, infection, or eardrum problems.
- Imaging: CT or MRI in selected cases to clarify the cause.
Treatment
Treatment addresses each component, often improving hearing even if part of the loss is permanent.
- Treating the conductive cause: Removing earwax, treating ear infections, draining fluid, repairing the eardrum, or surgery for otosclerosis.
- Hearing aids: Amplify sound to help with the sensorineural part and any remaining loss.
- Bone-conduction or implantable devices: Options for certain patterns of mixed loss.
- Cochlear implants: Considered for severe sensorineural loss not helped enough by hearing aids.
The plan is tailored to the specific causes and the degree of each component.
Prevention
- Protect your ears from loud noise with earplugs or earmuffs
- Treat ear infections promptly
- Avoid inserting objects into the ear canal
- Keep up with recommended hearing checks, especially as you age
- Ask about hearing risks before taking medications known to affect hearing
When to See a Doctor
See a doctor if you notice gradual or persistent hearing difficulty, frequent ear infections, ear pain or drainage, or ringing in the ears. Seek prompt care for sudden hearing loss, especially in one ear, as this can sometimes be treated more effectively when addressed early. An evaluation can identify which parts of the hearing system are involved and guide treatment.
Frequently Asked Questions
What does mixed hearing loss mean?
It means a person has both conductive and sensorineural hearing loss in the same ear. One part comes from a problem in the outer or middle ear, and the other from the inner ear or hearing nerve, so sounds may be both quieter and less clear.
Can mixed hearing loss be treated?
Often, yes. The conductive part, such as earwax, infection, or an eardrum problem, can frequently be treated, improving hearing. The sensorineural part may be permanent but can be helped with hearing aids or, in some cases, implantable devices.
What causes mixed hearing loss?
It happens when a conductive cause, like an ear infection or otosclerosis, occurs along with a sensorineural cause, like aging or noise damage. For example, age-related inner ear loss combined with a middle ear infection can produce mixed loss.
Should sudden hearing loss be treated as urgent?
Yes. Sudden hearing loss, especially in one ear, should be evaluated promptly, because some causes respond better to early treatment. Do not wait if your hearing drops suddenly.
References
- National Institute on Deafness and Other Communication Disorders (NIDCD). Hearing Loss.
- MedlinePlus, U.S. National Library of Medicine. Hearing loss.
- Mayo Clinic. Hearing loss — Symptoms and causes.
- American Speech-Language-Hearing Association (ASHA). Mixed Hearing Loss.