TL;DR
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A Finnish case-control study found that people diagnosed with Alzheimer’s before age 65 had more recorded health conditions and rising healthcare use in the years before diagnosis, especially during the final five years. High blood pressure and elevated blood lipids were not more common than in matched controls, and the researchers stress that no single symptom predicts the disease.
A study of 407 people diagnosed with Alzheimer’s before age 65 found that a range of health problems and healthcare use increased in the years before diagnosis, particularly during the final five years. The findings, based on Finnish hospital and national health-register data, also show that high blood pressure and elevated blood lipids were not more common in the patients than in matched controls.
Researchers from the University of Oulu and the University of Eastern Finland compared the patients’ health records with those of more than 4,000 people matched by age and sex who did not have a neurodegenerative disease. The study examined diagnoses and healthcare use across the 15 years before Alzheimer’s diagnosis. It found no significant differences in recorded illness between the groups 11 to 15 years before diagnosis, while differences became more apparent closer to it.
In the five years before diagnosis, people who later received an early-onset Alzheimer’s diagnosis were 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 more often as far back as six to 10 years before diagnosis, according to the study.
Healthcare use rose alongside the number of recorded conditions, with the steepest increase in visits during the final year before diagnosis. The researchers describe this as a pattern across multiple conditions and encounters, not a diagnostic test. The study was published in the journal Alzheimer’s & Dementia under the title “Comorbidities and health-care use prior to early-onset Alzheimer’s disease: A population-based case–control study.”
A Different Pattern Before Diagnosis
The findings may help explain why early-onset Alzheimer’s can be difficult to identify: early concerns may appear across different parts of a person’s health record rather than as one clear, disease-specific sign. The authors say a growing pattern of symptoms and healthcare visits could prompt clinicians to consider whether further assessment for a neurodegenerative condition is warranted, especially for working-age adults.
That possibility is not evidence that the pattern can identify Alzheimer’s in an individual. Many of the conditions reported in the study are common and can have causes unrelated to dementia. The authors state that no single disease or symptom predicts Alzheimer’s. Any potential benefit lies in noticing a broader pattern alongside clinical assessment, not in treating a list of conditions as a screening rule.
The cardiovascular finding also complicates assumptions drawn from research on later-onset Alzheimer’s. High blood pressure and hyperlipidemia are established risk factors associated with Alzheimer’s, but they were not more prevalent in this early-onset group than among controls. The study suggests the health profile before diagnosis may differ by age of onset, although it does not establish why.
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How the Finnish Study Compared Records
Early-onset Alzheimer’s refers here to disease diagnosed before age 65. Diagnosis can be delayed for years after symptoms first appear, and identifying dementia in working-age adults can be challenging, the source report says. This study looked backward from diagnosis to compare recorded health conditions and healthcare use, rather than testing a prospective method for predicting who will develop the disease.
The analysis drew on patients at Oulu University Hospital and Kuopio University Hospital, linked with nationwide Finnish health-register information. It included 407 people with early-onset Alzheimer’s and more than 4,000 age- and sex-matched controls. The researchers’ findings were published in 2026; the study’s DOI is 10.1002/alz.71831.
Because the study compares records from people who were diagnosed with those of controls, it can identify differences in recorded conditions and service use before diagnosis. It cannot, on its own, show that those conditions caused Alzheimer’s, that Alzheimer’s caused each condition, or that the same pattern will apply to every patient or to populations outside the study.
“No single disease or symptom predicts Alzheimer’s disease.”
— Laura Leppänen, doctoral researcher at the University of Oulu and the study’s first author
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Limits of the Pre-Diagnosis Pattern
The study does not establish whether the recorded conditions are early manifestations of Alzheimer’s, unrelated illnesses that occur alongside it, or a mixture of both. It also does not determine whether healthcare professionals could use the pattern to make diagnoses sooner, or whether doing so would improve outcomes. The reported associations are not proof of cause or prediction.
The source material does not provide detailed effect sizes for each condition, nor does it describe a validated threshold for deciding when a combination of symptoms should trigger an Alzheimer’s assessment. The patients were drawn from two Finnish hospital memory clinics, so the results may not represent every person with early-onset Alzheimer’s. It remains unclear whether similar patterns would be found in other healthcare systems or populations.
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Further Validation and Clinical Use
The study points to a need for more work on how early-onset dementia is recognized among working-age adults. A next step for researchers would be to test whether the observed pattern appears in other patient groups and whether it can help clinicians distinguish people who need further assessment from those with common conditions unrelated to dementia.
For now, the findings do not set out a new screening protocol or change diagnostic criteria. The study authors’ message is that clinicians may want to attend to the overall course of a patient’s health and healthcare use, while evaluating symptoms individually and in their clinical context. Diagnosis requires professional assessment; the study itself does not offer medical advice or a self-check tool.
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Key Questions
What did the study find before early-onset Alzheimer’s diagnosis?
Compared with matched controls, people diagnosed before age 65 had more records of several health conditions and used healthcare more often as diagnosis approached. The differences were most apparent in the five years before diagnosis, with the sharpest increase in healthcare visits during the final year.
Which conditions were more common in the patient group?
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 10 years before diagnosis. These associations do not mean any one condition predicts Alzheimer’s.
Were cardiovascular risk factors more common?
No. In this study, high blood pressure and hyperlipidemia were not more common among people with early-onset Alzheimer’s than among age- and sex-matched controls. The finding concerns this study group and does not show that cardiovascular health is irrelevant to Alzheimer’s in general.
Can these symptoms be used to diagnose Alzheimer’s?
No. The researchers said no single disease or symptom predicts Alzheimer’s, and the study did not validate a diagnostic checklist or screening tool. Questions about symptoms or changes in health should be discussed with a qualified healthcare professional.
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