Types of Hearing Loss - Conductive, Sensorineural & Mixed Explained

Understanding your type of hearing loss is the first step toward finding the right treatment. Not all hearing loss is the same - the cause, location of the problem, and severity all determine which treatment will work best for you. In this guide, our audiologists explain the three main types of hearing loss, what causes each one, and how they are treated.

How Hearing Works - A Quick Overview

To understand hearing loss types, it helps to know how sound travels through the ear:

1. Outer ear collects sound waves and funnels them into the ear canal
2. Middle ear contains the eardrum and three tiny bones (ossicles) that amplify vibrations
3. Inner ear (cochlea) converts vibrations into electrical signals using tiny hair cells
4. Auditory nerve carries these signals to the brain for processing

Hearing loss occurs when any part of this pathway is damaged or blocked. Where the problem occurs determines the type of hearing loss.

1. Conductive Hearing Loss

Conductive hearing loss occurs when sound cannot efficiently travel through the outer or middle ear to reach the inner ear. Think of it as a physical blockage or mechanical problem - the sound signal is weakened before it reaches the cochlea.

Common Causes

• Ear wax buildup (cerumen impaction): The most common and easily treatable cause
• Middle ear infection (otitis media): Very common in children in Pakistan
• Fluid in the middle ear: Often following infections or allergies
• Perforated eardrum: From infection, trauma, or sudden pressure changes
• Otosclerosis: Abnormal bone growth around the stapes bone
• Foreign object in ear canal: Especially common in young children
• Malformation: Congenital abnormalities of the outer or middle ear

Symptoms

• Sounds seem muffled or quiet but still clear
• Your own voice sounds louder than normal to you
• You may hear better in one ear than the other
• Ear pain, pressure, or discharge may be present
• You turn up volume but once loud enough, speech is clear

Treatment Options

• Ear wax removal: Professional cleaning by an audiologist
• Antibiotics: For middle ear infections
• Surgery: For otosclerosis, perforated eardrums, or structural problems
• Hearing aids: If medical treatment is not effective or chosen, BTE hearing aids work excellently

2. Sensorineural Hearing Loss (SNHL)

Sensorineural hearing loss is the most common type, accounting for about 90% of all hearing loss. It occurs when the tiny hair cells in the inner ear (cochlea) or the auditory nerve are damaged. Unlike conductive hearing loss, SNHL is usually permanent.

Common Causes

• Aging (presbycusis): The most common cause - gradual loss of hair cells over time
• Noise exposure: Prolonged exposure to loud sounds (factory work, loud music, generators)
• Genetics: Family history of hearing loss
• Ototoxic medications: Certain antibiotics, chemotherapy drugs, and high-dose aspirin
• Head trauma: Injury to the inner ear or auditory nerve
• Meniere's disease: Inner ear disorder causing hearing loss, vertigo, and tinnitus
• Viral infections: Measles, mumps, meningitis can damage the cochlea
• Congenital: Present from birth due to genetic factors or pregnancy complications

Symptoms

• Difficulty understanding speech, especially in noisy environments
• Sounds are not just quiet but also distorted or unclear
• High-pitched sounds (birds, children's voices, consonants) are harder to hear
• Frequently asking people to repeat themselves
• Tinnitus (ringing, buzzing, or hissing in the ears) often accompanies SNHL
• Difficulty hearing on the phone

Treatment Options

• Hearing aids: The primary treatment - modern digital hearing aids like Signia devices are specifically designed to address SNHL with multi-channel processing
• Cochlear implants: For severe to profound SNHL where hearing aids are insufficient
• Assistive listening devices: FM systems, amplified phones, TV streamers
• Communication strategies: Lip reading, sign language support

3. Mixed Hearing Loss

Mixed hearing loss is a combination of both conductive and sensorineural hearing loss. This means there is damage or blockage in the outer/middle ear AND damage to the inner ear or auditory nerve simultaneously.

Common Scenarios

• An elderly person with age-related SNHL who also develops an ear infection
• Someone with otosclerosis (conductive) who also has noise-induced inner ear damage
• A child with congenital inner ear damage who also has chronic middle ear fluid

Treatment

Mixed hearing loss is treated by addressing each component:

1. Treat the conductive component first: Medical or surgical treatment to address the outer/middle ear issue
2. Manage the sensorineural component: Fit hearing aids to compensate for the remaining permanent hearing loss

In many cases, resolving the conductive part significantly improves hearing, and a well-fitted hearing aid handles the rest effectively.

How We Diagnose Your Hearing Loss Type

At our clinic, we use several tests to determine exactly what type of hearing loss you have:

Pure Tone Audiometry (PTA)

The gold standard hearing test. We test both air conduction (sound through headphones) and bone conduction (sound through a vibrator placed behind the ear). The gap between these two results tells us whether hearing loss is conductive, sensorineural, or mixed.

Tympanometry

This test measures how well your eardrum moves. It helps identify middle ear problems like fluid, perforated eardrum, or ossicular chain problems. A flat tympanogram often indicates middle ear disease.

Speech Audiometry

We test your ability to understand speech at different volumes. This reveals how much your hearing loss affects real-world communication and helps us predict how well hearing aids will work for you.

Otoscopy

A visual examination of the ear canal and eardrum using an otoscope. This identifies wax blockages, infections, perforations, or other visible problems.

Which Hearing Aid Works Best for Each Type?

For Conductive Hearing Loss

Since the inner ear works normally, almost any hearing aid type works well. The hearing aid simply needs to make sounds louder to overcome the mechanical blockage. BTE models are often preferred for their power and reliability.

For Sensorineural Hearing Loss

Digital hearing aids with multiple channels are essential. The hearing aid must amplify different frequencies by different amounts, matching your specific audiogram. Models like the Signia Pure Nx (RIC) and Motion Nx (BTE) with advanced noise reduction are ideal.

For Mixed Hearing Loss

Power hearing aids may be needed since both components contribute to overall hearing loss. BTE models with strong amplification are typically recommended, programmed carefully to address both the conductive and sensorineural elements.