Most people know that high blood pressure raises the risk of heart attack and stroke. Fewer know that it also affects the brain in quieter ways, and that the blood pressure you have in your 40s, 50s and 60s may shape your memory and thinking decades later.

How common the problem is

The CDC reports that nearly half of US adults have high blood pressure, and many of them do not have it under control. Because it rarely causes symptoms, many people do not know their numbers are high.

What blood pressure has to do with the brain

The brain depends on a steady blood supply through a dense network of vessels, and high blood pressure strains blood vessels throughout the body. That is one reason researchers have looked closely at blood pressure as a target for protecting memory and thinking.

The 2024 report of the Lancet Commission on dementia prevention listed 14 modifiable risk factors for dementia, including high blood pressure, and estimated that addressing all of them could in theory prevent or delay nearly half of dementia cases. Hearing loss, high LDL cholesterol, physical inactivity, diabetes, smoking and excess alcohol are also on the list.

The National Institute on Aging includes managing high blood pressure among its practical steps for cognitive health, alongside controlling diabetes and cholesterol and treating hearing and vision loss.

What the SPRINT MIND trial found

The strongest trial evidence comes from SPRINT MIND, part of a large NIH-funded study published in JAMA in 2019. More than 9,000 adults with high blood pressure, average age 68, were assigned to a systolic target below 120 or below 140.

  • Intensive control significantly reduced the risk of mild cognitive impairment, the stage of memory and thinking problems that often comes before dementia.
  • It also reduced the combined risk of mild cognitive impairment or dementia.
  • The reduction in probable dementia alone was not statistically significant. The authors noted the study stopped early and may have been too small to detect a difference.

The practical lesson is that blood pressure control is one of the few proven ways to lower the risk of cognitive decline, and that the benefit appears within a few years. The right target for you depends on your age, other conditions, kidney function and how you tolerate treatment, which is a decision to make with your doctor.

Brain changes from blood pressure build slowly. Treating high blood pressure in midlife is about the brain you will have at 75 and 85 as much as the heart you have now. It is also why a reading that is “only a little high” deserves attention rather than a wait-and-see approach.

What helps besides medicine

Medicine is often needed, but habits matter too. NHLBI recommends a heart-healthy eating plan such as DASH, and notes that research it funded found DASH combined with a low-salt plan can be as effective as medicines in lowering high blood pressure. NHLBI also advises avoiding or limiting alcohol. The federal Dietary Guidelines advise most people to keep sodium below 2,300 mg a day.

Regular activity, a healthy weight, good sleep and not smoking all help as well, and they protect the brain in their own right.

Getting accurate numbers

Office readings can run high from nerves, or low because you rested in the waiting room. Home readings, taken correctly, give a truer picture of your everyday blood pressure. Our guide on how to check your blood pressure at home explains the technique and how to keep a log.

  • Measure at the same times each day, seated, after a few minutes of rest.
  • Use a validated upper-arm cuff that fits.
  • Bring the log, or a photo of it, to your appointments. A week of readings says more than any single number.
  • Tell your doctor about dizziness on standing, which can be a sign that treatment needs adjusting.

Pressure, kidneys and the brain

Blood pressure, kidney function and brain health are linked through the same small blood vessels. Kidney disease raises blood pressure, high blood pressure damages the kidneys, and both affect which medicines are safest. This overlap is the reason Dr. Shtern, who is board-certified in Internal Medicine and Nephrology, follows them together. Read more about hypertension care and about memory changes and when to see a doctor.

At Legacy Medical, many blood pressure follow-ups work well by video with your home log in hand, and members are seen the same or next business day when something comes up. To meet Dr. Shtern and talk about your numbers, book a complimentary meet and greet.

This article is general information, not advice for your situation. Members can call the office with questions about their own care.