Understanding Hearing Loss
Hearing loss affects millions of Americans and can occur at any age. It is not a single condition but rather a spectrum of disorders, each with different causes, characteristics, and treatment approaches. Understanding which type of hearing loss you have is essential to finding the most effective treatment.
Conductive Hearing Loss
Conductive hearing loss occurs when sound cannot efficiently travel through the outer or middle ear to reach the inner ear. This type of hearing loss is often caused by:
- Earwax (cerumen) buildup blocking the ear canal
- Fluid in the middle ear (common in children with ear infections)
- Perforated eardrum
- Abnormal bone growth in the middle ear (otosclerosis)
- Malformation of the outer or middle ear structures
Conductive hearing loss often results in sounds seeming muffled or quiet. In many cases, it can be medically or surgically treated. Hearing aids are also highly effective for this type of hearing loss.
Sensorineural Hearing Loss
Sensorineural hearing loss (SNHL) is the most common type of permanent hearing loss. It occurs when there is damage to the hair cells in the cochlea (inner ear) or to the auditory nerve. Common causes include:
- Aging (presbycusis) — the most common cause in adults over 60
- Noise exposure — from loud music, machinery, or other prolonged loud sounds
- Ototoxic medications (certain antibiotics, chemotherapy drugs)
- Viral infections (mumps, meningitis)
- Head trauma
- Genetic or hereditary conditions
Sensorineural hearing loss is typically not reversible, but hearing aids and cochlear implants are highly effective treatment options. People with SNHL often find it particularly difficult to understand speech, especially in noisy environments.
Mixed Hearing Loss
Mixed hearing loss is a combination of both conductive and sensorineural hearing loss. This means there is damage or dysfunction in both the outer or middle ear AND the inner ear or auditory nerve. Treatment depends on which component is more dominant and may include a combination of medical treatment and hearing aids.
Degrees of Hearing Loss
In addition to type, hearing loss is classified by degree of severity:
- Mild — Difficulty hearing soft sounds; trouble understanding speech in noisy environments
- Moderate — Difficulty hearing conversational speech at normal volumes
- Severe — Only able to hear very loud sounds; significant difficulty with speech understanding
- Profound — Hearing only very loud sounds or feeling vibrations; cochlear implants may be considered
A comprehensive hearing evaluation is the only way to accurately diagnose the type and degree of hearing loss. Contact us today to schedule an appointment.