High blood pressure and dementia

High blood pressure damages more than just blood vessels and organs. Arterial hypertension is one of the risk factors for vascular dementia. Vascular dementia is caused by circulation problems in the small vessels that supply the deeper structures of the brain. These problems are usually due to thickening of the vessel walls and the resulting reduced blood flow.

For a long time, dementia was only linked to blood pressure in rare cases affecting people over 80 with very low blood pressure. In that uncommon situation, reduced brain blood flow from low blood pressure is the main cause of dementia symptoms.

However, high blood pressure and this can start even at high-normal levels impairs brain function chronically and progressively. The presumed cause is damage to the smallest arteries in the brain caused by high pressure. These injuries or their consequences can be seen on an MRI of the brain as small infarcts (small strokes) or as damage to the major white-matter pathways in the brain.

Several studies on reducing dementia risk have shown that patients benefit from consistent treatment of their high blood pressure.

In the Syst-Eur Study Extension published in 2002, it was observed that among participants whose high blood pressure was consistently treated, the risk of developing dementia over a four-year follow-up dropped by about half.

Another research group followed 300 patients with Alzheimers disease for two and a half years. They also found that patients whose cardiac risk factors (such as high blood pressure) were continuously treated performed much better cognitively than the group whose risk factors were left untreated. In the untreated group, cognitive decline progressed rapidly.

New studies have shown that strict blood pressure control to prevent dementia is important well before old age. The University of California examined 579 people with an average age of 39.2 years. Brain scans showed changes in people who already had high blood pressure: their brains looked prematurely aged. Simply put, the brains of 30-year-olds with high blood pressure looked like those of 40-year-olds with normal blood pressure. What mattered was therefore not the age of the person but the blood pressure level. Even high-normal to mildly hypertensive values cause changes in brain structure.

An analysis of the British Whitehall II study provides concrete numbers. Over 32 years, 4.5 percent of the 8,600 participants developed dementia. At age 50, 29 percent of participants had a systolic blood pressure over 130 mmHg. Above this threshold, 6.3 percent developed dementia, compared with 3.7 percent at lower blood pressure. Adjusting for other risk factors like smoking and obesity, this corresponds to a 38 percent relative increase in dementia rate.

Another threshold appeared at systolic values above 150 mmHg: here the risk of developing dementia doubled again. This was independent of other cardiovascular diseases. Thus, the increased risk of dementia remains even if the person with hypertension has no other cardiovascular problems.

A Korean study also demonstrated the link between higher blood pressure and dementia. It found that in younger seniors (participants were 66 years old), the risk of vascular dementia was already increased at systolic blood pressure values over 130 mmHg. The risk of developing Alzheimers disease rose at systolic pressures of 160 mmHg and above.

A Chinese study published in November 2023 supports these findings. It examined about 34,000 people aged 40 or older from Chinese villages. The participants had high-normal blood pressure or mild hypertension. In some villages the usual local treatment for high blood pressure was used; in the other villages residents received an intensive blood pressure treatment aiming for systolic under 130 mmHg and diastolic under 80 mmHg. After four years, the villages that received the intensive treatment had a 15% lower risk of dementia and a 16% lower risk of cognitive impairment compared with the control villages.

An equally interesting finding came from a Swedish study published in 2024. It showed that long-term use of cardiovascular medications especially drugs for high blood pressure is associated with a markedly reduced risk of dementia. There was also a somewhat weaker protective effect for lipid-lowering drugs (cholesterol-lowering medications) and anticoagulants (blood thinners, but not antiplatelet drugs). When medications from these three groups were taken over many years, the protective effect increased even more.

Treating high blood pressure is therefore essential not only for the cardiovascular system but also for the brain. Lowering blood pressure, for example through lifestyle changes or medication, also reduces the risk of dementia.

Equally important in this context is prevention regularly checking blood pressure even before hypertension develops. Only then can follow-up diseases be countered in time.

Sources

This article comes from BloodPressureDB – the leading app since 2011 that helps hundreds of thousands monitor their blood pressure every day. Our content is based on carefully researched, evidence-based data and is continuously updated (as of 11/2025).

Author Sabine Croci is a qualified medical assistant with many years of experience in internal medicine and cardiology practices as well as in outpatient care, and has led BloodPressureDB's specialist editorial team since 2015. Thanks to her extensive additional qualifications as a paramedic, first responder and in various therapy and emergency areas, she provides solid, practical and reliably reviewed information.

High blood pressure and dementia

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