Alzheimer’s disease is one of the most heartbreaking diagnoses a family can face. The devastating condition gradually robs people of their memories, independence and, eventually, their ability to recognize the people they love.
But what if the first warning signs appeared somewhere unexpected, years before a person even noticed something was wrong with their memory?
What the new study found
A new study by researchers at the University of Oulu and the University of Eastern Finland, published in October 2026, has drawn attention to a potentially unsettling discovery.
Researchers identified a possible early warning sign of Alzheimer’s disease that may appear years before the more familiar symptoms, including memory loss, begin to emerge.
The research suggests that certain hearing problems, including persistent ringing in the ears and nerve-related hearing loss, may be associated with an increased risk of developing early-onset Alzheimer’s disease.
And the timing is particularly striking: these problems were more common among people who would later receive an Alzheimer’s diagnosis as much as 10 years before their condition was identified.
Hearing problems could appear years before an Alzheimer’s diagnosis
Published in the journal Alzheimer’s & Dementia, the research examined health problems experienced by people who were eventually diagnosed with early-onset Alzheimer’s, meaning the disease was identified before the age of 65.
Researchers found that certain ear-related conditions were more frequently reported in the years leading up to diagnosis.
In particular, people who would later develop Alzheimer’s were more than twice as likely to have experienced tinnitus, which causes persistent ringing or buzzing in the ears, or bilateral sensorineural hearing loss, a type of hearing impairment involving damage to the inner ear or auditory nerve pathways.
The difference was particularly noticeable six to 10 years before diagnosis.
According to figures discussed by American healthcare researcher Neal K Shah in a YouTube video titled ”10 Dementia Warning Signs You’re Missing,” 4.7% of future Alzheimer’s patients had these conditions, compared with 2.1% of people in the control group.
The figures rose to 5.2% and 2.9%, respectively, during the final five years before diagnosis.
While the findings do not establish that hearing problems cause Alzheimer’s, they offer an intriguing glimpse into how early the disease may begin affecting the body.
Why would Alzheimer’s affect hearing?
Scientists have several possible explanations for the connection.
One theory involves the brain’s limited cognitive resources, sometimes described as cognitive reserve.
When someone struggles to hear conversations, particularly in noisy environments, the brain must work harder to interpret sounds and understand speech.
That additional effort could leave fewer cognitive resources available for other tasks, including memory and concentration.
Another possibility is that Alzheimer’s-related changes may begin affecting the brain’s auditory processing systems long before noticeable memory problems develop.
The disease is associated with the accumulation of abnormal proteins, including amyloid plaques and tau tangles, which damage nerve cells and interfere with communication between different parts of the brain.
If areas responsible for processing sound are affected early, hearing-related difficulties could potentially emerge before more obvious cognitive symptoms.
In other words, what initially appears to be an ordinary hearing problem may sometimes be connected to changes taking place much deeper in the brain.
Other warning signs of Alzheimer’s disease
Alzheimer’s is the most common cause of dementia, accounting for an estimated 60% to 70% of cases worldwide.
It is a progressive brain disease that gradually damages memory, thinking and behavior. As the condition advances, everyday activities that once seemed effortless can become increasingly difficult.
According to Dr. Asiya Maula, a general practitioner and director at The Health Suite, people sometimes mistake the earliest symptoms for normal signs of aging.
”Many people dismiss the earliest symptoms of Alzheimer’s disease as simply getting older, but persistent changes in memory, thinking or behaviour should never be ignored,” she explained.
Other potential warning signs include:
- Memory problems: Repeatedly asking the same questions, forgetting recent conversations or struggling to remember appointments.
- Difficulty finding words: Having trouble following conversations or remembering familiar word.
- Confusion: Becoming disoriented about time, places or familiar surroundings.
- Problems with planning: Struggling with everyday tasks, organizing finances or making decisions.
- Personality changes: Becoming unusually anxious, withdrawn, irritable or confused.
- Losing things: Frequently misplacing belongings and being unable to retrace steps to find them.
- Withdrawal from activities: Losing interest in hobbies, work or social activities that were once enjoyable.
Family members are often among the first to notice these changes.
Dr. Maula explained that someone who has always been organized, for example, might suddenly struggle to keep track of appointments or manage their finances.
Others may become quieter, more anxious or less confident in situations they previously handled without difficulty.
When should you seek medical advice?
Although occasional forgetfulness is not necessarily a reason for concern, persistent changes in memory, hearing, thinking or behavior should not simply be dismissed. Anyone worried about their own symptoms or noticeable changes in a loved one should speak with a healthcare professional.
An initial assessment may be followed by more detailed memory testing or brain imaging, depending on the circumstances.
An early diagnosis can help people access support, understand their condition, plan for the future and explore available treatments or clinical research opportunities. And while an Alzheimer’s diagnosis can be devastating, it does not mean that life immediately comes to an end.
Many people continue to enjoy meaningful relationships and active lives for years after diagnosis.
That is why researchers are working to understand the disease earlier, identify potential warning signs and find ways to intervene before extensive damage occurs.
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