People who develop Alzheimer's disease before age 65 are more likely to have had dizziness, depression and hearing difficulties documented in the years leading up to their diagnosis, according to a Finnish study reported by aponet.de. The research, published in the journal "Alzheimer's & Dementia," drew on national health registers to compare the medical histories of 407 people with Alzheimer's against 4,035 controls of the same age and sex. Hearing-related problems stood out as appearing especially early.
Why it matters
Alzheimer's is usually discussed as a condition of old age, but a share of patients begin to show the disease before their 65th birthday. Recognizing signals that appear years ahead of a formal diagnosis could, in the researchers' view, eventually help identify the disease sooner in younger people. The study does not offer a screening tool, and its authors are careful about what the findings can and cannot show — but the pattern of symptoms it describes adds to a growing body of work on hearing and dementia.
What the records showed in the five years before diagnosis
In the half-decade before an Alzheimer's diagnosis, the people who went on to develop the disease had several complaints and conditions recorded more often than the comparison group. Alongside dizziness, depression and hearing problems, the study found higher documentation of strokes, epilepsy and certain brain injuries. In the twelve months immediately before diagnosis, the number of doctor visits and hospital contacts among the future patients also rose noticeably.
The patients averaged just under 61 years old at the time of diagnosis. Their histories were matched against those of people of the same age and sex who did not have Alzheimer's, using nationwide registers.
Ear-related diagnoses six to ten years earlier
The most striking timing concerned conditions in the ear, nose and throat area. Six to ten years before diagnosis, tinnitus and hearing loss in both ears caused by a disturbance in the inner ear or the auditory nerve were recorded more frequently among the future patients. In that window, 4.7 percent of those who later developed Alzheimer's had received at least one such diagnosis, compared with 2.1 percent of the controls. The figures combine both hearing problems.
Looking further back, at eleven to fifteen years before diagnosis, the researchers found no statistically clear differences between the two groups. That suggests the gap in documented symptoms emerges within a defined period rather than being present indefinitely.
A surprise on heart risk factors
The study also turned up a result that runs against expectations. High blood pressure and elevated blood lipid levels — well-known risk factors for Alzheimer's in older age — were not significantly more common in the records of the people who later developed the early-onset form. The researchers note that cardiovascular risk factors carry more weight in late-onset Alzheimer's, which makes their relative absence here notable.
What the findings cannot tell you
The results do not allow anyone to predict whether a person with dizziness, depression or ringing in the ears will go on to develop Alzheimer's. Even among those who did develop the disease, each individual symptom was documented in only a minority. Most future patients had no record of any given complaint.
It also remains unresolved whether these documented problems are early consequences of Alzheimer's pathology or stem from other causes. Because the study is based on diagnoses already entered into health records, it cannot establish cause and effect. The authors nonetheless express hope that the findings may one day support earlier recognition of Alzheimer's in younger patients.
The study arrives amid wider attention to the link between hearing and cognitive decline. Separate coverage aggregated alongside the aponet.de report cites analyses linking reduced hearing to higher dementia risk and suggesting that hearing aids may lower it, though those figures come from other outlets and other studies, not from the Finnish register work.
For now, the Finnish team's contribution is a descriptive one: a map of which health complaints tend to appear in the medical record, and when, before an early-onset Alzheimer's diagnosis. The next step would be research designed to test whether those signals have predictive value — and whether acting on them, particularly on hearing loss, changes anything for patients.
