Early-onset Alzheimer’s Patients Accumulate Symptoms Years Before Diagnosis

TL;DR

Before you orderOffer from Amazon

Get health and wellness essentials delivered free with Prime

• Fast, free delivery on millions of items
• Prime Video, Amazon Music and more included
• Member-only deals all year

Start your free Prime trial →Free trial for eligible customers · Cancel anytime

As an affiliate, we earn on qualifying purchases.Hide

A Finnish case-control study found that people diagnosed with Alzheimer’s before age 65 had more of several health conditions and increasing healthcare use, particularly in the five years before diagnosis. High blood pressure and high cholesterol were not more common than in matched controls, and the findings do not mean that any one symptom predicts Alzheimer’s.

A Finnish study found that people diagnosed with Alzheimer’s disease before age 65 had a wider range of health problems and increased healthcare use in the years leading up to diagnosis, particularly during the five-year period beforehand. The researchers also found that high blood pressure and high blood lipid levels were not more common in these patients than in age- and sex-matched controls, challenging the assumption that the familiar cardiovascular risk profile applies in the same way to early-onset disease.

Researchers from the University of Oulu and the University of Eastern Finland examined health conditions recorded during the 15 years before diagnosis. The study included 407 people with early-onset Alzheimer’s and compared their records with those of more than 4,000 controls matched by age and sex. The data came from memory clinics at Oulu University Hospital and Kuopio University Hospital, combined with nationwide health registers.

Compared with controls, people later diagnosed with early-onset Alzheimer’s were more likely to have records of depression, dizziness, headaches, traumatic brain injuries, epilepsy, cerebrovascular disorders, thyroid diseases and problems related to heavy alcohol use. Tinnitus and hearing loss were already more common six to 10 years before diagnosis. The researchers reported no significant differences in morbidity 11 to 15 years before diagnosis, suggesting that the differences they identified became more apparent closer to diagnosis.

Healthcare use also rose as diagnosis approached, with the steepest increase in visits during the final year. The study’s authors describe a pattern across conditions and encounters, not a diagnostic test: they say no single condition or symptom predicts Alzheimer’s disease. The research was published in Alzheimer’s & Dementia as a population-based case-control study.

Recognizing Patterns Before Diagnosis

The findings matter because early-onset dementia can be difficult to recognize in working-age adults, and diagnosis may come years after symptoms begin. A person’s health visits may initially address separate complaints, while the overall pattern becomes visible only over time. The authors suggest that awareness of accumulating, seemingly unrelated health issues could help clinicians consider a neurodegenerative condition earlier when assessing a patient.

That possibility should not be mistaken for evidence that these conditions cause Alzheimer’s, or that people with them are likely to develop it. The study compared groups using health records; it did not establish that the listed conditions predict disease for an individual. Its other key implication is that early-onset Alzheimer’s may have a different health profile from the better-studied late-onset form, including the absence of a higher prevalence of two familiar cardiovascular risk factors in this sample.

How the Finnish Study Was Built

Early-onset Alzheimer’s refers here to Alzheimer’s diagnosed before age 65. The study looked backward from diagnosis across a 15-year period, comparing recorded conditions and healthcare use between people with the disease and matched controls. This design can identify differences in health records over time, but it cannot by itself explain why those differences arose or establish that they caused, preceded or signaled the disease in each person.

The contrast with late-onset Alzheimer’s is relevant because advanced age and cardiovascular factors, including high blood pressure and high blood lipid levels, are commonly discussed in relation to Alzheimer’s risk. In this study, those two factors were not more common among people with early-onset disease than among controls. Lead investigator Johanna Krüger said the results support treating early-onset Alzheimer’s as more than simply the same condition appearing at a younger age.

“Our results suggest that, in the years before diagnosis, patients may accumulate a variety of seemingly unrelated symptoms and healthcare encounters.”

— Laura Leppänen, study first author and doctoral researcher at the University of Oulu

Limits of the Health Record Findings

The study does not show that any of the listed conditions cause Alzheimer’s or reliably predict it. It also does not establish whether the recorded problems were early manifestations of disease, separate health issues, or influenced by other factors. The reported group-level differences cannot be used on their own to determine an individual’s diagnosis or future risk.

The source report does not provide detailed estimates for each condition, the size of the differences, or information about how the researchers accounted for possible confounding factors. Nor does it establish that the patterns found in these Finnish records will be identical in other populations or healthcare systems. The authors’ interpretation that early-onset disease may involve partly different mechanisms remains an interpretation of the observed findings, not proof of a distinct biological process.

Earlier Recognition, Not a Screening Test

The researchers say the results point to a need for earlier recognition of dementia among working-age adults. The study does not announce a new screening tool or diagnostic rule. Any clinical use of the findings would require further work to establish whether the patterns can help distinguish early-onset Alzheimer’s from other causes of symptoms and whether earlier recognition changes care.

For now, the next step is for clinicians and researchers to evaluate the findings alongside other evidence and the patient’s full clinical picture. The article does not specify a planned follow-up study or a timetable for further results. People concerned about memory or other health changes should discuss them with a qualified healthcare professional; this study is not a basis for self-diagnosis.

Key Questions

What did the study find before early-onset Alzheimer’s diagnosis?

Among people diagnosed before age 65, researchers found more recorded health problems and rising healthcare use as diagnosis approached, especially in the five preceding years. The study found group differences, not a reliable prediction for an individual.

Which conditions were more common in the early-onset 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.

Were high blood pressure and high cholesterol more common?

No. The researchers reported that high blood pressure and high blood lipid levels were not more common among people with early-onset Alzheimer’s than among the matched controls in this study.

Can these symptoms tell someone they have Alzheimer’s?

No. The researchers said no single condition or symptom predicts Alzheimer’s. The findings describe differences between groups in health records and are not a diagnostic test. People with health concerns should seek advice from a qualified healthcare professional.

Source: rss