TL;DR
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A study of 407 people diagnosed with Alzheimer’s before age 65 found a wider range of health conditions and more healthcare use, particularly in the five years before diagnosis. High blood pressure and high cholesterol were not more common than among matched controls; researchers say the patterns do not predict Alzheimer’s in an individual.
A study led by researchers at the University of Oulu and the University of Eastern Finland found that people diagnosed with Alzheimer’s disease before age 65 had a growing range of health problems and increased healthcare use, especially during the five years before diagnosis. The researchers said the pattern may help clinicians recognize when further assessment is warranted, but no individual condition or symptom identified in the study predicts Alzheimer’s disease.
The population-based case-control study examined health conditions recorded in the 15 years before diagnosis for 407 people with early-onset Alzheimer’s disease. Their records were compared with those of more than 4,000 people matched by age and sex who did not have a neurodegenerative disease. The data came from memory clinics at Oulu University Hospital and Kuopio University Hospital, linked with nationwide health registers.
During the five years before diagnosis, the Alzheimer’s group was more likely than controls to have records of depression, dizziness, headaches, traumatic brain injuries, epilepsy and cerebrovascular disorders. Thyroid diseases and problems related to heavy alcohol use were also more common. Tinnitus and hearing loss were reported as more common six to ten years before diagnosis. The researchers found no significant differences in morbidity between the groups 11 to 15 years before diagnosis.
Healthcare use also rose as diagnosis approached, alongside the accumulation of health conditions. The sharpest increase in healthcare visits occurred in the final year before diagnosis. The study reports associations in health records; it does not establish that these conditions cause Alzheimer’s or that they are specific to the disease.
Patterns Could Prompt Earlier Assessment
Early-onset Alzheimer’s can affect people during working age, when symptoms may be difficult to recognize and attribute to a neurodegenerative condition. The researchers say diagnosis is often delayed by several years after symptoms first appear. A rise in varied health complaints and healthcare encounters could be a reason to consider a broader assessment, particularly when problems accumulate over time.
That possibility has limits. None of the listed conditions is a diagnostic marker on its own, and many occur for reasons unrelated to Alzheimer’s. The study does not test a screening tool or show that tracking these patterns would shorten the time to diagnosis. Its findings describe differences between groups and may inform further research into earlier recognition.
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Early-Onset and Later-Onset Differences
Early-onset Alzheimer’s refers to disease diagnosed before age 65. The study focused on whether health conditions and use of healthcare services differed before diagnosis from patterns among age- and sex-matched controls. The authors contrasted their findings with the better-known association between late-onset Alzheimer’s and cardiovascular risk factors.
In this study, high blood pressure and hyperlipidemia were not more common among people with early-onset Alzheimer’s than among controls. Lead investigator Adjunct Professor Johanna Krüger said the findings support the view that early-onset disease is not simply a younger-age version of late-onset Alzheimer’s. The study, published in Alzheimer’s & Dementia, is titled “Comorbidities and health-care use prior to early-onset Alzheimer’s disease: A population-based case–control study.”
“Our results suggest that, in the years before diagnosis, patients may accumulate a variety of seemingly unrelated symptoms and healthcare encounters.”
— Laura Leppänen, doctoral researcher at the University of Oulu and the study’s first author
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Limits of the Health Record Findings
The study identifies conditions associated with the period before diagnosis, but it does not establish why those conditions were more common or whether they were early effects of Alzheimer’s, unrelated health problems, or a combination. It also does not show that the conditions can distinguish people who will develop Alzheimer’s from those who will not.
The report does not provide a validated method for combining symptoms or healthcare visits into a prediction, nor does it show whether the findings apply beyond the Finnish patient and health-register data. The exact reasons for the increase in healthcare use, and whether clinicians could use the pattern to reduce diagnostic delays, remain unclear.
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Further Work on Earlier Recognition
The findings point to a need for further research into how health patterns before diagnosis might inform assessment of working-age adults. A next step would be to test whether the observed combination of conditions and healthcare encounters can be replicated in other populations and whether it adds useful information to clinical evaluation.
For now, the report does not recommend treating any one symptom as evidence of Alzheimer’s. People with health concerns should discuss them with a qualified healthcare professional; assessment and diagnosis require clinical evaluation. The study’s authors say the broader pattern may help raise suspicion earlier, but whether that leads to earlier or more accurate diagnosis has not been established.
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Key Questions
What did the study find before early-onset Alzheimer’s diagnosis?
Among 407 people diagnosed before age 65, researchers found a broader range of recorded health conditions and increased healthcare use, especially in the five years before diagnosis, compared with more than 4,000 matched controls.
Which health conditions were more common?
The study reported higher rates of recorded depression, dizziness, headaches, traumatic brain injuries, epilepsy, cerebrovascular disorders, thyroid diseases and problems related to heavy alcohol use. Tinnitus and hearing loss were more common six to ten years before diagnosis.
Do these symptoms mean someone has Alzheimer’s?
No. The researchers said no single disease or symptom predicts Alzheimer’s. The study found group-level associations in health records, not a diagnostic test for individuals.
What happened to cardiovascular risk factors?
In this study, high blood pressure and hyperlipidemia were not more common among people with early-onset Alzheimer’s than among the age- and sex-matched controls.
How was the study conducted?
Researchers compared records for 407 people with early-onset Alzheimer’s with records for more than 4,000 matched controls, using memory-clinic patient data from two Finnish hospitals and nationwide health registers covering the 15 years before diagnosis.
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