Types of Hearing Loss — 5 Degrees Explained
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Hearing loss is classified by where in the auditory system the damage occurs — not just by how much hearing is lost. Understanding the type determines which treatments work, and understanding the degree determines how much amplification is needed.
If you are wondering why you are losing your hearing, read our companion guide on the Causes of Hearing Loss. Below, we explain how hearing loss is classified.
The 4 Types of Hearing Loss
1. Sensorineural Hearing Loss — Most Common in Adults
Sensorineural hearing loss results from damage to the hair cells in the cochlea or the auditory nerve connecting the cochlea to the brain. It accounts for approximately 90% of all adult hearing loss cases.
- Cause: Age-related degeneration (presbycusis), noise exposure, genetics, ototoxic medications, or viral infections.
- Characteristics: Permanent in most cases; sounds may be audible but unclear, especially consonants.
- Treatment: Hearing aids are the primary treatment; cochlear implants for severe-to-profound cases.
- What it sounds like: Speech sounds muffled; high-pitched sounds (birds, phone ringtones) disappear first.
2. Conductive Hearing Loss — Usually Temporary
Conductive hearing loss occurs when sound cannot efficiently travel through the outer or middle ear to reach the cochlea. The inner ear itself is typically unaffected.
- Cause: Earwax blockage, ear infections (otitis media), perforated eardrum, fluid in the middle ear, or otosclerosis.
- Characteristics: Often temporary and treatable; sounds are reduced in volume but remain clear.
- Treatment: Medical or surgical treatment of the underlying cause; hearing aids if surgery is not appropriate.
- What it sounds like: Everything sounds quieter, like hearing through earplugs or cotton wool.
3. Mixed Hearing Loss
Mixed hearing loss involves both sensorineural and conductive components — damage to both the inner ear/auditory nerve and the outer/middle ear pathway.
- Cause: Any combination of the above causes occurring simultaneously.
- Treatment: Addresses the conductive component medically first; hearing aids for the remaining sensorineural component.
- Prevalence: Less common than pure sensorineural; more common in older adults with age-related inner ear loss plus recurring ear infections.
4. Auditory Neuropathy Spectrum Disorder (ANSD)
ANSD occurs when sound enters the cochlea normally but the auditory nerve fails to transmit signals to the brain reliably. Standard hearing tests may show normal results while the person experiences significant difficulty understanding speech.
- Cause: Damage to inner hair cells, auditory nerve, or brainstem auditory pathways; associated with premature birth, jaundice, genetic factors.
- Characteristics: Normal or near-normal pure-tone audiogram but severely impaired speech understanding; inconsistent day-to-day hearing.
- Treatment: Cochlear implants show strong outcomes; hearing aids provide variable benefit.
- Diagnosis: Requires ABR (auditory brainstem response) testing beyond a standard audiogram.
The 5 Degrees of Hearing Loss (Plus Normal)
Degree of hearing loss is measured in decibels (dB HL) — the softest sound a person can hear at each frequency. Normal hearing is defined as the ability to detect sounds between 0 and 25 dB HL.
| Degree | Threshold | What You Struggle to Hear | Typical Treatment |
|---|---|---|---|
| Normal | 0–25 dB | Nothing significant | No treatment needed |
| Mild | 26–40 dB | Soft speech, whispers, distant conversation | OTC hearing aids; optional audiologist |
| Moderate | 41–55 dB | Normal conversation, especially in noise | Prescription or OTC hearing aids |
| Moderate-Severe | 56–70 dB | Most speech without aids | Prescription hearing aids required |
| Severe | 71–90 dB | Loud speech, shouted conversation | Powerful hearing aids or cochlear implant eval |
| Profound | 91+ dB | Almost no hearing without amplification | Cochlear implants often most effective option |
How Degrees Are Measured
An audiologist plots your hearing thresholds at 6–8 frequencies (250–8,000 Hz) on an audiogram — a graph with frequency on the horizontal axis and volume (dB) on the vertical axis. Your “degree” is typically based on the average of thresholds at 500, 1,000, 2,000, and 4,000 Hz — the frequencies most critical for understanding speech.
Mild loss often goes undetected for years because the brain compensates — increasing listening effort rather than triggering obvious awareness of hearing difficulty. The average person waits 7 years from first noticing hearing difficulty to seeking treatment.
Types vs. Degrees
The same degree of hearing loss can have different implications depending on the type:
- Mild sensorineural loss: Permanent; OTC or prescription aids appropriate.
- Mild conductive loss: Often temporary and reversible with treatment of the underlying cause.
- Mild mixed loss: Treat the conductive component first; reassess degree afterward.
- Moderate sensorineural loss: Prescription aids with audiologist fitting produce best outcomes.
- Severe sensorineural loss: Cochlear implant evaluation warranted if aids provide insufficient benefit.
Frequently Asked Questions
Q: Can hearing loss be reversed?
Answer: Conductive hearing loss caused by earwax, infection, or fluid is often fully reversible with treatment. Sensorineural hearing loss — the most common type in adults — is not currently reversible with any approved treatment. Gene therapy research and hair cell regeneration trials are ongoing but not yet available clinically as of 2026.
Q: What is the most common type of hearing loss in older adults?
Answer: Presbycusis (age-related sensorineural hearing loss) affects 1 in 3 adults over 65 and 1 in 2 adults over 75. It typically begins with high-frequency loss (difficulty hearing consonants and high-pitched voices) before progressing to broader frequency ranges.
Q: How is hearing loss different from deafness?
Answer: “Deaf” in a medical context refers to profound hearing loss (91+ dB) with minimal usable hearing. “Hard of hearing” describes any degree from mild to severe. However, these terms carry deep cultural significance — many individuals who identify as part of Deaf Culture (Big-D Deaf) do not view their hearing status as a medical condition requiring treatment.
Q: At what age should children have hearing screenings?
Answer: Newborn hearing screening is supported and mandated by Early Hearing Detection and Intervention (EHDI) programs in all 50 US states. Beyond that, children should have hearing screenings at ages 4, 5, 6, 8, and 10 as part of routine school health checks.
Q: Can noise-induced hearing loss be prevented?
Answer: Yes — noise-induced hearing loss is entirely preventable. The NIOSH safe exposure limit is 85 dB for an 8-hour workday. Safe exposure time halves for every 3 dB increase above 85 dB. Wearing hearing protection in loud environments prevents the cochlear hair cell damage that causes permanent sensorineural loss.
Understanding your exact type and degree of hearing loss is the first step toward better hearing. If you suspect you have hearing loss, schedule a comprehensive evaluation with a licensed audiologist today to map out your personalized treatment plan.
Medical disclaimer: The information provided in this article is for educational purposes only and does not replace professional medical advice. Always consult an audiologist or ENT specialist for personalized recommendations and diagnosis.
