Why Millions Of Adults May Have No Idea They Have High Blood Pressure

More Than Half of Adults With High Blood Pressure in England Don’t Know It

A study of more than 1.3 million adults in England found that 58.8% of people with high blood pressure had no idea they had it. No reported diagnosis, just high blood pressure showing up at the study visit while people went about their normal lives, apparently unaware of it.

It gets worse from there. Among people who were already being treated with medication, 50.2% still had uncontrolled blood pressure, readings high enough to put them at risk. Researchers say the combined toll, people who don’t know they have high blood pressure plus people whose treatment hasn’t brought it under control, adds up to a health system that keeps missing one of the leading causes of illness and death in the country.

This wasn’t a small survey. The research, published in BMJ Public Health, comes from the Our Future Health program, which measured blood pressure in person for more than 1.3 million adults across England between 2022 and 2025. That makes it one of the largest snapshots of blood pressure ever taken in the country, far bigger than the government’s regular health surveys, which typically track only about 4,000 households a year. Data collection ran across more than 200 enrollment centers in England.

Uncovering a Hidden High Blood Pressure Crisis in England

Researchers pulled data from Our Future Health, a large ongoing health study that invited adults across England to enrollment centers where staff measured their blood pressure directly, instead of relying on people to report it themselves. Participants also answered questions about their health history, lifestyle, and any medications they were taking.

A reading of 140/90 mmHg or higher counted as high blood pressure, as did already being on medication for it. Researchers then split people into four groups: those who had never been diagnosed, those diagnosed but not treated, those treated but still not under control, and those whose blood pressure was fully managed.

After removing a small number of unreliable readings and a larger group of people with serious health conditions that could skew the results, researchers were left with 1,312,551 participants. Of them, 37.2% had high blood pressure, according to this analysis, and the rate was consistently higher in men than in women. The numbers climbed sharply with age: among men, it rose from 23% in 18 to 39 year olds to 73% in those 80 and older. Among women, it rose from just 10% to 69% across the same range.

High Blood Pressure Risk Climbs With Age, Weight and Family History

Older age, being male, carrying more weight, and having a personal or family history of heart disease or diabetes were all linked to higher odds of high blood pressure. Black participants showed higher odds of high blood pressure than white participants once age was factored in, even though their raw numbers looked similar. South Asian and East Asian participants had lower raw rates than white participants, though for East Asians, much of that gap disappeared once researchers accounted for other factors like age and weight. A history of heart disease or diabetes also made people more likely to actually get diagnosed, a pattern the study’s authors suggest may reflect doctors being quicker to catch blood pressure problems in patients who already have other health issues, but not necessarily in everyone else.

One detail stood out to the study’s authors: there were no demographic subgroups where high blood pressure wasn’t a widespread problem. Younger, leaner adults with no family history of heart disease had lower rates than everyone else, but even their numbers were too high to write off.

Half of Treated Patients Still Have High Blood Pressure

Researchers also looked at what happened to people already being treated with medication. Taking blood pressure drugs was linked to lower odds of having uncontrolled blood pressure, and the protection got stronger with each additional drug, going from one medication to two to three tracked with progressively better control, according to the paper.

Researchers also checked whether blood pressure medication raised the risk of falls, since these drugs can sometimes cause dizziness or fainting by lowering blood flow to the brain. They found no clear link between medication use and a history of falls in this data, pushing back against a common worry about treating high blood pressure in older adults, a worry doctors sometimes cite when deciding whether to prescribe.

A Leaky Cascade Lets High Blood Pressure Go Untreated

Study authors describe what’s happening as a “leaky cascade of care.” People start out with high blood pressure, and at every step, from getting diagnosed to getting treated to actually getting the condition under control, a large share fall through the cracks. The paper points to current medical guidelines that require multiple follow-up blood pressure checks, sometimes with home monitors or all-day monitoring devices, before doctors will officially diagnose someone or start treatment. That approach is meant to avoid misdiagnosing people who only get high readings in a doctor’s office, known as “white coat” high blood pressure. But the authors question whether that approach is contributing to delays and argue that current guidelines on confirming a diagnosis before starting medication should be reconsidered.

Here’s the bigger picture, and it isn’t subtle. High blood pressure isn’t some rare condition affecting an unlucky few, it affects over a third of adults in this analysis, and the systems meant to catch it are missing more than half the people who have it. The authors argue that the size of the detection and control gaps means England needs approaches that reach beyond identifying high-risk patients one at a time.

---

Disclaimer: This article is based on findings from peer-reviewed research and is intended for general informational purposes. It is not a substitute for professional medical advice, diagnosis, or treatment, and readers with concerns about their blood pressure should talk to a qualified healthcare provider.

---