Sudden Hearing Loss in One Ear: Why Quick Action Matters

Waking up to find you cannot hear out of one ear, or noticing your hearing suddenly drop during the day, can be alarming. Sudden hearing loss in one ear is not something to brush off or wait out. In many cases, early evaluation and treatment may improve outcomes, which is why our audiology team encourages patients to seek care promptly when this symptom occurs.

What Is Sudden Sensorineural Hearing Loss?

Sudden sensorineural hearing loss (SSHL) refers to a rapid decline in hearing, typically occurring over a period of hours to a few days. It most often affects only one ear. Patients sometimes describe it as waking up with muffled hearing, feeling like one ear is "plugged," or noticing a significant difference when using the phone.

According to a clinical practice guideline published by the American Academy of Otolaryngology–Head and Neck Surgery (AAO-HNS) in Otolaryngology–Head and Neck Surgery (Chandrasekhar et al., 2019), SSHL is defined as a hearing drop of at least 30 decibels across three connected frequencies, occurring within 72 hours or less. The guideline is clear that it should be treated as a medical urgency because delays in diagnosis may affect potential recovery.

Possible Causes and Contributing Factors

In many cases, the exact cause of sudden hearing loss in one ear remains unknown, a situation doctors refer to as "idiopathic" SSHL. However, there are several conditions that may contribute to or be associated with sudden hearing changes:

• Viral infections: Some viral illnesses can affect the inner ear or auditory nerve.
• Circulatory problems: Reduced blood flow to the delicate structures of the inner ear may play a role in some cases.
• Autoimmune conditions: The body's immune response can occasionally affect hearing.
• Head trauma or injury: Physical trauma may damage the ear structures.
• Ototoxic medications: Certain medications can affect hearing as a side effect.
• Meniere's disease: This inner ear disorder can cause episodes of hearing loss along with vertigo and tinnitus.
• Acoustic neuroma: A benign tumor on the hearing nerve can sometimes present with sudden hearing changes.

Because so many different conditions can present similarly, a thorough evaluation by a specialist is essential to determine what may be happening and rule out treatable causes.

Common Symptoms to Watch For

Sudden hearing loss in one ear may come with additional symptoms that can help guide evaluation. Many patients report:

• A feeling of fullness or pressure in the affected ear
• Tinnitus (ringing, buzzing, or roaring sounds)
• Dizziness or a sense of imbalance
• Difficulty understanding speech, especially in noisy environments

Some people initially assume they have earwax buildup, allergies, or a simple ear infection. While these conditions can certainly affect hearing, true SSHL involves the inner ear or auditory nerve and requires different evaluation and management.

When Should You See a Specialist?

If hearing drops noticeably in one ear over hours or a day, get evaluated as soon as possible: the sooner the better, and definitely within two weeks of onset. The AAO-HNS guideline notes that treatment initiated early may offer the greatest chance of hearing improvement, though outcomes can vary.

The main early treatment is corticosteroids, given by mouth or injected through the eardrum (a randomized trial in JAMA found the two routes give similar recovery), and the guideline advises starting them within two weeks of onset. Steroid injections can still be offered as a rescue option for two to six weeks after onset.

At Capital ENT, our audiology team can perform comprehensive hearing tests to determine the type and degree of hearing loss you are experiencing. If testing suggests sensorineural involvement, our ENT physicians can further evaluate for underlying causes and discuss appropriate next steps. An MRI of the hearing nerve is usually recommended by the AAO-HNS guideline to rule out a rare growth on the nerve. Routine blood tests and CT scans are not needed for most patients.

It is also important to rule out more straightforward causes of hearing changes, such as fluid behind the eardrum or eustachian tube dysfunction. Our team can assess whether eustachian tube dilation or other interventions might be relevant to your situation.

What to Expect During Evaluation

When you visit our office for sudden hearing loss, the evaluation typically includes:

• A detailed history of your symptoms and overall health
• A physical examination of the ear canal and eardrum
• Audiometric testing to measure hearing thresholds in both ears
• Additional tests if indicated, such as tympanometry to assess middle ear function

Based on the results, our team will discuss findings with you and outline options for monitoring or management. If hearing devices may be helpful for your situation, our audiologists can also discuss hearing aids and other assistive technologies.

Why Prompt Attention Matters

Sudden hearing loss in one ear can sometimes resolve on its own, but many cases do not improve without intervention. Because the window for certain treatments may be limited, waiting too long to seek care can reduce available options. Even if hearing does not fully return, early evaluation helps ensure nothing serious is missed and allows for appropriate follow-up.

At Capital ENT, we understand how unsettling sudden hearing changes can be. Our audiology team and ENT specialists work together to provide thorough, compassionate care for patients experiencing hearing concerns. If you or a loved one notices a sudden change in hearing, please do not hesitate to reach out.

Sources

• Chandrasekhar SS, Tsai Do BS, Schwartz SR, et al. Clinical Practice Guideline: Sudden Hearing Loss (Update). Otolaryngology–Head and Neck Surgery. 2019;161(1_suppl):S1-S45. American Academy of Otolaryngology–Head and Neck Surgery. PubMed
• Rauch SD, et al. Oral vs intratympanic corticosteroid therapy for idiopathic sudden sensorineural hearing loss: a randomized trial. JAMA. 2011. PubMed