Hearing Loss in One Ear: Causes and Treatment Options
Key takeaways
- Unilateral hearing loss (hearing loss in one ear) has several possible causes, including noise exposure, viral infection, Meniere's disease, and acoustic neuroma.
- Sudden unilateral hearing loss may require prompt medical evaluation.
- People with one-sided hearing loss often struggle with locating sounds and understanding speech in noise.
- Treatment options depend on the cause and may include hearing aids, CROS/BiCROS systems, bone-anchored devices, or cochlear implants.
- An audiologist and ENT physician can work together to evaluate and manage unilateral hearing loss.
Hearing loss that affects only one ear — called unilateral hearing loss (UHL) or single-sided deafness (SSD) when severe — presents unique challenges. While the other ear may hear normally, the absence of binaural (two-ear) hearing affects the ability to locate sounds, understand speech in noise, and hear from the affected side.
Sudden hearing loss in one ear requires prompt evaluation
If you have experienced a sudden, rapid loss of hearing in one ear, contact a physician or ENT specialist promptly. Sudden sensorineural hearing loss may be treatable if addressed quickly. Learn more about sudden hearing loss.
Causes of hearing loss in one ear
Unilateral hearing loss can be conductive, sensorineural, or mixed, and has many possible causes:
Sensorineural causes
- •Sudden sensorineural hearing loss (SSNHL) — rapid onset, often with no identified cause
- •Acoustic neuroma (vestibular schwannoma) — a benign tumor on the auditory nerve
- •Meniere's disease — episodes of vertigo, tinnitus, and fluctuating hearing loss
- •Viral infections (mumps, measles, herpes zoster oticus)
- •Noise trauma — a single loud event affecting one ear
- •Autoimmune inner ear disease
Conductive causes
- •Earwax blockage in one ear
- •Ear infection (otitis media) in one ear
- •Perforated eardrum
- •Otosclerosis affecting one ear more than the other
- •Aural atresia (malformation of the ear canal)
How unilateral hearing loss affects daily life
Normal binaural hearing allows the brain to compare the timing and loudness of sounds arriving at each ear, which is essential for locating sounds and separating speech from background noise. With only one functioning ear:
- •Locating the direction of sounds is difficult or impossible
- •Understanding speech in noisy environments is significantly harder
- •Sounds from the affected side may be missed entirely
- •Listening fatigue is common — the brain works harder to compensate
- •Phone calls on the affected side are difficult
Treatment options
Treatment depends on the cause, degree, and type of hearing loss. Options include:
- •Conventional hearing aid — appropriate for mild to moderate unilateral loss where the affected ear retains some usable hearing
- •CROS hearing aid (Contralateral Routing of Signal) — a microphone on the affected side transmits sound to a receiver in the better ear; used when the affected ear has no usable hearing
- •BiCROS hearing aid — similar to CROS but the better ear also has some hearing loss and benefits from amplification
- •Bone-anchored hearing system (BAHS) — a surgically implanted or non-surgical device that transmits sound through bone conduction to the better ear
- •Cochlear implant — may be considered for adults with severe to profound unilateral sensorineural hearing loss who do not benefit from other options
- •Medical or surgical treatment — for conductive causes such as ear infections, perforated eardrums, or otosclerosis
Frequently asked questions
Do I need a hearing aid if only one ear is affected?
It depends on the degree of loss and how much it affects your daily life. Many people with unilateral hearing loss benefit from amplification or routing devices. An audiologist can evaluate your hearing and recommend appropriate options.
Can unilateral hearing loss be caused by a tumor?
Yes. Acoustic neuroma (vestibular schwannoma) is a benign tumor on the auditory nerve that can cause unilateral hearing loss, tinnitus, and balance problems. It is not common, but it is one reason why new or unexplained unilateral hearing loss warrants medical evaluation.
Is hearing loss in one ear a disability?
Unilateral hearing loss can significantly affect communication and quality of life, particularly in noisy environments. Whether it qualifies as a disability under applicable law depends on the specific legal framework and degree of functional impairment.
Sources
- 1. American Academy of Otolaryngology–Head and Neck Surgery (AAO-HNS). Single-Sided Deafness. entnet.org. Accessed September 2026.
- 2. National Institute on Deafness and Other Communication Disorders (NIDCD). Sudden Deafness. nidcd.nih.gov. Accessed September 2026.