Never having your blood pressure measured
Checked against 4 peer-reviewed sources, most recently on 25 September 2026.
Most people assume that if their blood pressure were high, they would know. Around the world, a large share of people with high blood pressure had never been diagnosed with it. Higher long-term blood pressure is closely linked to deaths from heart disease and stroke, and in a trial in Canada, communities that ran check sessions later had fewer hospital admissions for heart attack, heart failure and stroke. The fix: get your blood pressure checked once in a while.
The one honest fix
Make sure to get your blood pressure checked once in a while. If it's high, get it rechecked.
What the evidence says
In a pooled analysis of population-representative studies that measured blood pressure in 184 countries (986 of the studies asked about a previous diagnosis), worldwide 41% of women aged 30 to 79 who had high blood pressure in 2019 (95% credible interval 38-45) did not report ever having been diagnosed with it, and among men the share was 51% (48-54); high blood pressure meant a measured reading of 140/90 or above, or taking medication for it
41% · 95% credible interval 38-45
Limitations & how to read this number
These are worldwide figures, pooled from health surveys in 184 countries and estimated with a statistical model, so they are not the figure for any one country. Countries differed widely; the United States was among the countries where the most people with high blood pressure were being treated. Whether someone had been diagnosed was based on what they told the survey, which can be misremembered, although checks against medical records find it usually agrees. Most surveys measured blood pressure at a single visit, which can count more people as having high blood pressure than measurements repeated on separate days would. Not having been diagnosed is not the same as having no symptoms; the figure shows only that many people with high blood pressure had not been told they had it.
SourceNCD Risk Factor Collaboration (NCD-RisC) (2021) · The Lancet · 10.1016/S0140-6736(21)01330-1
In a meta-analysis of individual data from 61 prospective studies of about one million adults with no previous heart disease or stroke, at ages 40 to 69 each 20 mmHg higher usual systolic blood pressure was associated with about twice the death rate from heart disease and more than twice the death rate from stroke, with no sign of a threshold down to at least 115/75 mmHg
Limitations & how to read this number
These studies followed people over time and link blood pressure to later deaths; they show an association, not proof that the blood pressure alone caused them, although the pattern was very consistent. The doubling is for people aged 40 to 69, and the link was about half as strong at ages 80 to 89 as at ages 40 to 49. It describes differences in long-run average blood pressure, estimated from readings taken at the start, not the effect of any single reading, and the analysis was published in 2002.
SourceLewington S, Clarke R, Qizilbash N, Peto R, Collins R; Prospective Studies Collaboration (2002) · The Lancet · 10.1016/S0140-6736(02)11911-8
How to actually do it
Make sure to get your blood pressure checked once in a while - a doctor, nurse or pharmacist can do it - and ask for the number. If it is high, have it rechecked by a clinician - one reading on its own is not a diagnosis. That is the whole change. It needs nothing you don't already have.
Supporting findings (2)
In a trial that randomised 39 mid-sized communities in Ontario, Canada, the 20 communities that ran free blood-pressure and heart-risk check sessions in local pharmacies for people aged 65 and over in 2006 had fewer hospital admissions for heart attack, heart failure and stroke combined among all residents that age, over a year measured from September 2007 to August 2008, than the 19 communities offered no programme (rate ratio 0.91, 95% CI 0.86-0.97)
−9% · RR 0.91, 95% CI 0.86-0.97
This was a single trial, in older adults in one Canadian province: the sessions ran for ten weeks in autumn 2006, and hospital admissions were compared over one year, from September 2007 to August 2008. The programme did more than measure blood pressure: the sessions also covered other heart risk factors and education, the results were sent to each person's family doctor and pharmacist, and a community nurse followed up people found to be at high risk, so the trial cannot say which part made the difference - the researchers say so themselves. The comparison communities had the usual care available to everyone in Ontario. The 140,642 is everyone aged 65 or over living in the 39 communities in 2005, not the number who attended; 15,889 people took part in the sessions. Fewer admissions were seen for heart attack and heart failure but not for stroke on its own, and there was no difference in deaths from any cause over that year.
SourceKaczorowski J, Chambers LW, Dolovich L, Paterson JM, Karwalajtys T, Gierman T, et al. (2011) · BMJ · 10.1136/bmj.d442
A systematic review for the US Preventive Services Task Force found that initial office blood-pressure screening agreed only partly with 24-hour monitoring (pooled sensitivity 0.54, 95% CI 0.37-0.70; specificity 0.90, 95% CI 0.84-0.95; 15 studies), so a high reading needs confirming before a diagnosis, and that the direct harms of being measured were minimal
Accuracy was judged against 24-hour monitoring, which is itself not perfect, and the studies differed a lot in who was measured and how. The result means that a first screening can both miss high blood pressure and wrongly suggest it - it is a reason to have a high reading rechecked, not a reason to skip being measured.
SourceGuirguis-Blake JM, Evans CV, Webber EM, Coppola EL, Perdue LA, Weyrich MS (2021) · JAMA · 10.1001/jama.2020.21669
Go deeper
Open what you care about
Why you can't go by how you feel
Blood pressure is a number, and the only way to know it is to measure it. When researchers pooled health surveys from 184 countries that measured blood pressure, about four in ten women and half of men aged 30 to 79 who had high blood pressure had never been diagnosed with it. These are worldwide figures, and countries differed widely; the United States was among the countries where the most people with high blood pressure were being treated.
What the evidence for checking actually shows
One trial tested a programme of check sessions directly. It randomised 39 Canadian communities: 20 ran free blood-pressure and heart-risk sessions in local pharmacies for people aged 65 and over, and 19 had no programme. In a year that began about a year after the sessions, the communities that had run them had fewer hospital admissions for heart attack and heart failure. The sessions did more than measure blood pressure, so the trial cannot say which part made the difference. It is the only trial of its kind a systematic review for the US Preventive Services Task Force found.
Kaczorowski J, Chambers LW, Dolovich L, Paterson JM, Karwalajtys T, Gierman T, et al. 2011 · Guirguis-Blake JM, Evans CV, Webber EM, Coppola EL, Perdue LA, Weyrich MS 2021
Why one reading isn't the end of it
A first screening in a clinic can miss high blood pressure and can also suggest it when it is not there, which is why a high reading is checked again before anyone calls it a diagnosis. Being measured itself caused very little harm in the studies reviewed. That is a reason to have a high number rechecked - not a reason to skip being measured.
Guirguis-Blake JM, Evans CV, Webber EM, Coppola EL, Perdue LA, Weyrich MS 2021
Questions people ask
Does high blood pressure actually cause heart attacks and strokes, or is it just linked to them?
The large analysis behind this answer followed about a million adults over time and showed a strong, consistent link between higher long-term blood pressure and deaths from heart disease and stroke. On their own, studies like these show a link rather than proof. This page is about finding out your number, not about what to do next - that is a conversation to have with a clinician.
My reading came back high. What now?
Have it rechecked by a doctor or nurse. A first screening can be wrong in either direction, and a diagnosis is made on repeated measurements, not one. This page does not give advice on what a particular number means for you.
Sources
- NCD Risk Factor Collaboration (NCD-RisC) (2021). Worldwide trends in hypertension prevalence and progress in treatment and control from 1990 to 2019: a pooled analysis of 1201 population-representative studies with 104 million participants. The Lancet. Meta-analysis of cross-sectional studies. doi:10.1016/S0140-6736(21)01330-1
- Kaczorowski J, Chambers LW, Dolovich L, Paterson JM, Karwalajtys T, Gierman T, et al. (2011). Improving cardiovascular health at population level: 39 community cluster randomised trial of Cardiovascular Health Awareness Program (CHAP). BMJ. Randomised controlled trial. doi:10.1136/bmj.d442
- Lewington S, Clarke R, Qizilbash N, Peto R, Collins R; Prospective Studies Collaboration (2002). Age-specific relevance of usual blood pressure to vascular mortality: a meta-analysis of individual data for one million adults in 61 prospective studies. The Lancet. Meta-analysis of cohort studies. doi:10.1016/S0140-6736(02)11911-8
- Guirguis-Blake JM, Evans CV, Webber EM, Coppola EL, Perdue LA, Weyrich MS (2021). Screening for Hypertension in Adults: Updated Evidence Report and Systematic Review for the US Preventive Services Task Force. JAMA. Meta-analysis of cross-sectional studies. doi:10.1001/jama.2020.21669
Published 25 September 2026 · Evidence last verified 25 September 2026 · adversarial fact-check + human science gate — how we check.
Corrections are published openly on the corrections page. Educational content, not medical advice — talk to a professional about your own situation.