Hearing That Fades Over Weeks, Not Years, Can Be a Red Flag for Illness Beyond the Ear

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That is the case made by a team of ear, nose, and throat specialists and a neurologist at Sunderland Royal Hospital in England. In a review of rapidly progressive hearing loss in The Journal of Laryngology & Otology, they started with a patient whose hearing worsened over 12 weeks and then searched the medical literature for everything that could explain that pattern. They found 15 possible causes. Most were serious or affected the whole body, and in some, treating the cause could restore hearing.

Doctors tend to sort hearing loss by speed, and the two ends of the spectrum are well mapped.

Slow, age-related hearing loss is extremely common. According to the National Institute on Deafness and Other Communication Disorders (NIDCD), about 15% of American adults, or 37.5 million people, report some trouble hearing. Disabling hearing loss affects about 10% of adults ages 55 to 64, 22% of those ages 65 to 74, and 55% of those 75 and older.

At the other extreme is sudden sensorineural hearing loss, often called sudden deafness. The NIDCD defines it as an unexplained, rapid loss of hearing either all at once or over a few days. Experts estimate it strikes one to six people per 5,000 each year, most often adults in their late 40s and early 50s, and it frequently affects only one ear.

Hearing loss that unfolds over several weeks sits awkwardly between those two categories. The Sunderland authors noted that little guidance existed for it, which is what prompted their review.

The list the team assembled reads less like an ear clinic’s caseload and more like a tour of the rest of the body.

Several causes involve the brain and the area around it. These include meningioma and other tumors, lymphoma, cancer that has spread from elsewhere, cavernous angioma (a cluster of abnormal blood vessels), meningitis, and superficial siderosis, a condition in which iron deposits build up on the surface of the brain and nerves.

Others are paraneoplastic syndromes, in which the immune system’s response to a cancer, such as small cell lung cancer or thymoma, damages healthy tissue far from the tumor. A third group is inflammatory and autoimmune, including autoimmune inner ear disease, sarcoidosis, vasculitis, and Sjögren’s syndrome. Infections made the list too, notably syphilis and HIV, along with medication-related causes.

The common thread is that hearing may be the first thing to go, before more obvious signs of the underlying disease appear. The authors concluded that hearing loss progressing over weeks should be treated as a red flag that needs urgent evaluation, both because the causes are often serious and because some of the hearing loss may be reversible if the cause is found.

People often expect hearing trouble to come with other ear symptoms, and many inner ear disorders do. Ménière’s disease, for example, typically brings severe dizziness, ringing in the ears, and a feeling of fullness or pressure along with the hearing loss, and it usually affects only one ear.

Hearing that fades in both ears without those companions is different, and it is easy to brush off. Someone who already has some age-related hearing loss may simply assume it is getting worse on its own schedule. That assumption is exactly what the red flag is meant to challenge: the key question is not only how much hearing has been lost, but how fast.

The NIDCD’s own list of causes for sudden deafness overlaps with the Sunderland review. It includes infections, head trauma, autoimmune diseases, certain drugs used to treat cancer or severe infections, blood circulation problems, and neurological disorders such as multiple sclerosis. Even so, only about 10% of people diagnosed with sudden deafness have an identifiable cause. The agency also notes that autoimmune disease can cause sudden hearing loss in one or both ears.

Timing can change the outcome. The NIDCD says sudden deafness symptoms should be treated as a medical emergency. Corticosteroids are the most common treatment, and the agency warns that treatment delayed for more than two to four weeks is less likely to reverse or reduce permanent hearing loss. About half of people with sudden deafness recover some or all of their hearing on their own.

For hearing loss that builds over weeks, the review’s central point is that the ear may not be where the answer lies. Finding the cause can mean looking for a tumor, an infection, or an immune disorder, and treating that condition may be what gives hearing a chance to recover.

The review has limits. It is built on one patient and on published case reports, so it cannot say how often each cause turns up or which is most likely in any individual.

The first step is usually simple. A hearing test called audiometry measures the softest sounds a person can hear at different pitches, and comparing hearing through the ear canal with hearing through bone can help show what type of hearing loss is present. Anyone whose hearing changes noticeably over days or weeks, in one ear or both, should see a clinician promptly, even without dizziness, ringing, or pain.

What is rapidly progressive hearing loss?

It is hearing loss that worsens over a period of weeks. It falls between sudden deafness, which develops all at once or over a few days, and the slow hearing loss that comes with age.

A review of the medical literature by specialists at Sunderland Royal Hospital in England found 15 possible causes, most of them serious or affecting the whole body. Some, if found and treated, may allow hearing to recover.

What can cause hearing to fade over weeks?

Causes identified in the review include brain tumors and lymphoma, meningitis, superficial siderosis, cancer-related immune syndromes, autoimmune and inflammatory diseases such as sarcoidosis and Sjögren’s syndrome, infections such as syphilis and HIV, and medications.

Can serious hearing loss happen without dizziness or ringing?

Yes. Some inner ear disorders, such as Ménière’s disease, usually cause vertigo and ringing, but hearing loss from other causes may come without those symptoms.

The NIDCD estimates it affects one to six people per 5,000 each year, most often adults in their late 40s and early 50s. Only about 10% of people diagnosed have an identifiable cause.

What should someone do if their hearing worsens quickly?

See a clinician promptly. Federal health officials say sudden deafness should be treated as a medical emergency, because steroid treatment delayed more than two to four weeks is less likely to help.