Hearing loss is not the same for everyone. The type depends on which part of the hearing system is affected.
The three primary categories are conductive hearing loss, sensorineural hearing loss, and mixed hearing loss. A hearing evaluation can help identify the type and degree of hearing loss and guide appropriate next steps.
Conductive Hearing Loss
Conductive hearing loss occurs when sound cannot travel normally through the outer or middle ear.
Possible causes include:
- Earwax blocking the ear canal
- Fluid behind the eardrum
- An outer- or middle-ear infection
- A damaged or perforated eardrum
- Problems involving the small middle-ear bones
- Differences in how the outer or middle ear developed
Sounds may seem quiet, muffled, or blocked. Depending on the cause, conductive hearing loss may be temporary or treatable with medical care, surgery, or another appropriate intervention. A hearing professional can determine whether sound is being blocked and whether additional medical evaluation is needed.
Sensorineural Hearing Loss
Sensorineural hearing loss occurs when the inner ear or auditory nerve is not working in the usual way. It is the most common general category of permanent hearing loss.
Possible causes include:
- Aging
- Repeated exposure to loud sounds
- A single extremely loud sound
- Genetic factors
- Certain illnesses or infections
- Head injuries
- Medications that can affect hearing
People with sensorineural hearing loss may hear sounds but have difficulty understanding speech clearly — especially in restaurants, meetings, or other noisy environments. Higher-pitched sounds may become harder to hear, and words may seem distorted rather than simply quiet. Sensorineural hearing loss is often permanent, but hearing aids, assistive listening devices, cochlear implants, communication strategies, and other care may help, depending on the individual evaluation.
Mixed Hearing Loss
Mixed hearing loss includes both conductive and sensorineural components.
For example, a person may have permanent inner-ear hearing loss and also develop earwax blockage, middle-ear fluid, or another condition that further reduces hearing. Treatment depends on each component. The conductive part may sometimes be medically treatable, while the sensorineural part may require hearing technology or other ongoing support.
Auditory Neuropathy Spectrum Disorder
Auditory neuropathy spectrum disorder is less common. Sound may enter the ear normally, but the signal is not transmitted or organized in a way the brain can understand consistently. A person may detect sounds but have significant difficulty understanding speech. Specialized testing is needed to identify this condition and determine appropriate support.
Type and Degree Are Different
Type: The type of hearing loss describes where the problem occurs within the hearing system.
Degree: The degree describes how much hearing ability has been reduced. Hearing loss may be described as mild, moderate, severe, or profound.
Hearing loss may also be:
- Unilateral or bilateral: affecting one ear or both ears
- Symmetrical or asymmetrical: similar in both ears or different between ears
- Stable or fluctuating: remaining consistent or changing over time
- Progressive or sudden: developing gradually or appearing quickly
- Congenital or acquired: present at birth or developing later
These descriptions help hearing professionals understand the complete hearing profile.
How an Audiologist Identifies the Type
An audiologist may begin by asking about hearing difficulties, noise exposure, medications, health history, and when the change began.
The evaluation may include:
- Looking into the ear canal
- Measuring responses to different pitches and volumes
- Comparing air-conduction and bone-conduction results
- Testing speech understanding
- Checking eardrum and middle-ear function
- Performing additional specialized tests when appropriate
An online hearing screening may identify a possible concern, but it cannot determine the type or cause of hearing loss and does not replace a comprehensive evaluation.
When to Seek Urgent Medical Care
Seek immediate medical care if hearing drops suddenly in one or both ears, whether the change happens all at once or over several days. Sudden hearing loss may occur with tinnitus, dizziness, or a feeling of fullness in the ear. Do not assume a sudden change is caused by allergies, sinus congestion, or earwax. Prompt evaluation may affect available treatment options.
The Bottom Line
Understanding the type of hearing loss is essential because different causes require different forms of care. A comprehensive hearing evaluation can identify the pattern and degree of hearing loss and help determine whether medical treatment, hearing technology, communication strategies, or another next step may be appropriate.
Frequently asked questions
- What is the most common type of permanent hearing loss?
- Sensorineural hearing loss is the most common general category of permanent hearing loss. It involves the inner ear or auditory nerve.
- Can a person have more than one type of hearing loss?
- Yes. Mixed hearing loss includes both conductive and sensorineural components.
- Is conductive hearing loss permanent?
- It depends on the cause. Some conductive hearing loss is temporary or medically treatable, while other cases may require longer-term care.
- Can an online screening identify the type of hearing loss?
- No. An online screening may identify a possible hearing concern, but determining the type and possible cause requires a professional evaluation.
- Is sudden hearing loss an emergency?
- Yes. A sudden decrease in hearing should receive immediate medical evaluation.