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A study of 407 people diagnosed with Alzheimer’s before age 65 found that a range of health conditions and health care use increased as diagnosis approached, particularly during the preceding five years. High blood pressure and elevated blood lipids were not more common than among matched controls, and the researchers say 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 health care use became more common in the years before diagnosis, with the clearest changes in the final five years. The Finnish researchers also found that high blood pressure and elevated blood lipids were not more common among the patients than among matched controls, suggesting early-onset disease may have a different pre-diagnosis health profile from Alzheimer’s that begins later in life.
Researchers from the University of Oulu and the University of Eastern Finland compared patient records from memory clinics at Oulu University Hospital and Kuopio University Hospital with nationwide health-register data. The 407 people with early-onset Alzheimer’s were compared with more than 4,000 controls matched by age and sex. The study examined diagnoses and health conditions over the 15 years before the Alzheimer’s diagnosis.
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 appeared more often in the patient group six to 10 years before diagnosis.
The study found no significant differences in recorded morbidity between the groups 11 to 15 years before diagnosis. Health care use rose as diagnosis approached, with the steepest increase in visits during the final year. These are patterns across groups, not a method for identifying Alzheimer’s in an individual: the researchers emphasize that no single condition or symptom predicts the disease.
A Broader Pattern Before Diagnosis
The findings point to a potential challenge in recognizing Alzheimer’s among working-age adults: early symptoms and related health problems may appear across different parts of a person’s health record rather than as one clear warning sign. A pattern of repeated health care encounters could prompt clinicians to consider whether cognitive changes or a neurodegenerative condition need evaluation, the researchers suggest. The study does not establish that the listed conditions cause Alzheimer’s or that they can be used as a screening checklist.
The contrast in cardiovascular risk factors also matters. High blood pressure and elevated blood lipids are familiar risk factors associated with Alzheimer’s, particularly later-onset disease, but they were not more common in this early-onset group than among controls. The result supports further study of whether early- and late-onset Alzheimer’s have partly different pathways. It does not show that cardiovascular health is irrelevant to an individual’s risk.
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How the Finnish Study Was Built
Early-onset Alzheimer’s refers here to disease diagnosed before age 65. Diagnosis can be difficult in working-age adults, and the source report says it may be delayed by several years after symptoms begin. The study’s approach was retrospective: investigators compared health records from the years before diagnosis rather than testing whether a symptom pattern could prospectively identify people who will develop the disease.
The findings were reported in the journal Alzheimer’s & Dementia in a population-based case-control study by Laura Leppänen and colleagues. The report identifies Leppänen, a doctoral researcher at the University of Oulu, as the study’s first author, and Adjunct Professor Johanna Krüger of the University of Oulu as lead investigator. The analysis draws on memory-clinic patient data and national registers, allowing researchers to compare recorded conditions and service use over time.
“No single disease or symptom predicts Alzheimer’s disease.”
— Laura Leppänen, the study’s first author
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Limits of the Symptom Pattern
The results show associations in health records, not that the conditions caused Alzheimer’s or appeared because of it. The report does not give a validated threshold for how many symptoms or visits should lead to an Alzheimer’s assessment, nor does it establish how accurately this pattern distinguishes Alzheimer’s from other causes of illness. Many of the listed conditions are common and can occur for reasons unrelated to dementia.
The source material does not provide detailed estimates for each condition, the absolute numbers of health care visits, or evidence that the pattern applies equally across different populations. It also does not show whether the findings can predict disease in people who have not yet been diagnosed. The researchers describe the possibility of distinct mechanisms between early- and late-onset disease as an interpretation, not a settled explanation.
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Testing Earlier Recognition in Practice
The study authors argue that early-onset dementia should be recognized sooner among working-age adults and that the broader pattern of health problems and visits merits attention. The next step is further research to establish whether such patterns can help clinicians identify people who need a cognitive or neurological evaluation, and how useful they are alongside a patient’s symptoms and clinical assessment.
No new diagnostic guidance or screening recommendation is described in the report. People experiencing health concerns should seek advice from a qualified health professional; the study’s findings are not a diagnosis and should not be used to infer Alzheimer’s from any single symptom.
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Key Questions
What did the study find before early-onset Alzheimer’s diagnosis?
In the five years before diagnosis, patients were more likely than matched controls to have records of several conditions, including depression, dizziness, headaches, epilepsy and cerebrovascular disorders. Health care use also rose, most sharply in the final year.
Does any one of these symptoms mean someone has Alzheimer’s?
No. The study’s first author said that no single disease or symptom predicts Alzheimer’s. The reported findings describe group-level patterns in records, not a diagnostic test for an individual.
Were cardiovascular risk factors more common in the early-onset group?
No. The study found that high blood pressure and elevated blood lipids were not more common among people with early-onset Alzheimer’s than among age- and sex-matched controls.
How many people were included?
The study included 407 people diagnosed before age 65 and compared their records with those of more than 4,000 controls matched by age and sex.
Can the findings be used to screen for Alzheimer’s now?
The report does not establish a screening method or diagnostic threshold. It suggests that the overall pattern may help raise clinical suspicion, but further research is needed to determine whether it can support earlier recognition in practice.
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