TL;DR
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A Finnish case-control study found that people diagnosed with Alzheimer’s disease before 65 had more of several health conditions and increasing healthcare use, especially in the five years before diagnosis. High blood pressure and elevated blood lipids were not more common than among matched controls. The findings describe patterns across groups, not symptoms that can predict Alzheimer’s in an individual.
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 leading up to diagnosis, particularly in the final five years. Researchers from the University of Oulu and the University of Eastern Finland also found that high blood pressure and elevated blood lipids were not more common in the patient group than among age- and sex-matched controls, challenging the assumption that familiar cardiovascular risk patterns apply equally to early-onset disease.
The researchers examined health conditions recorded during the 15 years before diagnosis, using patient data from memory clinics at Oulu University Hospital and Kuopio University Hospital alongside nationwide health-register information. They compared the 407 patients with more than 4,000 controls matched by age and sex who did not have a neurodegenerative disease.
In the five years before diagnosis, patients were more likely than controls to have records of depression, dizziness, headaches, traumatic brain injuries, epilepsy and cerebrovascular disorders. Thyroid diseases and problems associated with heavy alcohol use were also more common. Tinnitus and hearing loss were already more frequent six to ten years before diagnosis.
The study found no significant differences in recorded morbidity between the groups 11 to 15 years before diagnosis. Healthcare use rose as diagnosis approached, with the steepest increase in visits in the final year. The authors describe these as group-level patterns; they do not establish that any specific condition causes Alzheimer’s or can identify who will develop it.
Patterns That May Prompt Earlier Assessment
Early-onset Alzheimer’s can be difficult to recognize in working-age adults, and diagnosis may come years after symptoms begin, the report says. A growing mix of health complaints and more frequent healthcare encounters could, in some cases, prompt clinicians to consider whether a cognitive or neurological assessment is warranted. The study does not test a screening tool, however, and offers no validated symptom checklist or threshold for diagnosis.
The findings also caution against relying only on the risk profile commonly associated with later-life Alzheimer’s. In this study, hypertension and hyperlipidemia were not more prevalent among people with early-onset disease than among controls. That result may help shape research into whether early-onset Alzheimer’s has partly different associated health patterns, but it does not show that cardiovascular health is irrelevant to Alzheimer’s overall.
For readers, the practical distinction is important: several common conditions appeared more often in the patient group, but none was shown to predict Alzheimer’s on its own. The results describe associations in health records, not a basis for self-diagnosis or a conclusion that an individual symptom signals dementia.
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How Researchers Tracked Pre-Diagnosis Health
The report concerns early-onset Alzheimer’s disease, defined here as disease diagnosed before age 65. The study was a population-based case-control analysis: researchers compared patients’ registered conditions and healthcare use with those of matched people without neurodegenerative disease. It looked backward from the date of diagnosis rather than following participants to test whether particular conditions led to Alzheimer’s.
The study’s 15-year window allowed the team to compare different periods before diagnosis. Its finding of no significant morbidity differences 11 to 15 years beforehand contrasts with the broader differences closer to diagnosis. The report suggests that identifiable patterns became more apparent nearer to diagnosis, but the design cannot establish when the disease process itself began or explain why the health-record differences emerged.
The results were reported by News-Medical from research by the University of Oulu and the University of Eastern Finland. The paper, by Leppänen and colleagues, was published in Alzheimer’s & Dementia in 2026 under the title “Comorbidities and health-care use prior to early-onset Alzheimer’s disease: A population-based case–control 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 Health-Record Findings
The study identifies associations, not causes. It does not show whether the recorded conditions were early manifestations of Alzheimer’s, separate health problems, or related to other factors. Nor does it establish that the findings can be used to predict disease in people who have not been diagnosed.
The report does not provide enough detail to determine how well the observed patterns would distinguish early-onset Alzheimer’s from other illnesses in routine care. It also does not show whether the results apply to populations outside Finland, where healthcare access, record-keeping and patient characteristics may differ. The reason cardiovascular risk factors were not more common in this patient group remains unresolved.
Because the study looked at people whose diagnosis was already known, it cannot by itself show that acting on the patterns would shorten diagnostic delays or improve outcomes. The authors’ suggestion that recognizing the overall pattern could raise suspicion earlier is a possible application, not a tested clinical result.
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Research Needed Before Clinical Use
The study authors argue that the findings support earlier consideration of dementia and Alzheimer’s among working-age adults. Further research would need to test whether these patterns appear in other patient groups and whether they can help clinicians distinguish early-onset Alzheimer’s from other causes of similar complaints.
Future work could also examine which combinations and timing of conditions are most informative, while accounting for differences in healthcare use and medical history. Until such evidence is available, the study does not establish a new diagnostic method or change the need for professional clinical assessment. People concerned about memory or other health changes should discuss them with a qualified healthcare professional; this research is not medical advice.
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Key Questions
What did the study find before early-onset Alzheimer’s diagnosis?
Among 407 people diagnosed before age 65, several health conditions and healthcare use were more common as diagnosis approached, especially during the final five years, compared with matched controls.
Which health 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 ten years before diagnosis.
Did the study find that high blood pressure predicts early-onset Alzheimer’s?
No. The researchers found that high blood pressure and elevated blood lipids were not more common among patients than among matched controls. The study did not test whether either factor predicts Alzheimer’s in an individual.
Can these symptoms be used to diagnose Alzheimer’s?
No. The authors said no single condition or symptom predicts Alzheimer’s. The research describes differences between groups in health records and does not provide a diagnostic checklist or self-assessment method.
Where was the study conducted?
The research drew on memory-clinic data from Oulu University Hospital and Kuopio University Hospital, combined with nationwide Finnish health-register data. Its findings may need to be tested in other populations.
Source: rss
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