About 1.4 billion adults worldwide have high blood pressure, and roughly 120 million of them live in the United States. Those numbers make hypertension one of the most common chronic conditions on the planet, affecting one in three adults globally and nearly one in two in the U.S.
Global Numbers
The World Health Organization estimates that 1.4 billion adults aged 30 to 79 had hypertension in 2024. That translates to 33% of the world’s population in that age range. The burden is not evenly distributed: low- and middle-income countries carry a disproportionate share, partly because screening and treatment are less accessible.
How Common It Is in the United States
In the U.S., the numbers are striking. CDC data from August 2021 through August 2023 found that 47.7% of adults 18 and older had hypertension. Applied to the adult population, that works out to roughly 119.9 million people.
Men are more likely to have high blood pressure than women: 50.8% versus 44.6%. That gap narrows after menopause, when hormonal changes that previously offered some cardiovascular protection decline. By their 60s, women catch up to men in prevalence.
Who Is Most Affected
Race plays a significant role in hypertension risk in the U.S. Black adults have the highest prevalence at 58%, compared to about 44% among white and Hispanic adults. This disparity reflects a combination of genetic factors, chronic stress related to systemic inequality, dietary patterns, and unequal access to healthcare. It also helps explain why Black Americans face higher rates of stroke, heart failure, and kidney disease.
Age is the other major driver. High blood pressure is relatively uncommon in young adults but rises sharply with each decade. By age 60, the majority of adults have readings above the threshold. Blood vessels naturally stiffen over time, which increases the force blood exerts on artery walls with every heartbeat.
What Counts as High Blood Pressure
The American Heart Association and American College of Cardiology updated their guidelines in 2025, maintaining a framework that classifies blood pressure into four categories:
- Normal: below 120/80 mmHg
- Elevated: 120 to 129 systolic (the top number) with a diastolic (bottom number) still below 80
- Stage 1 hypertension: 130 to 139 systolic or 80 to 89 diastolic
- Stage 2 hypertension: 140 or higher systolic, or 90 or higher diastolic
If your top and bottom numbers fall into different categories, the higher category applies. So a reading of 138/72 counts as Stage 1 hypertension, even though 72 is normal for diastolic pressure. This classification system is part of the reason nearly half of American adults now qualify as having high blood pressure. Before 2017, the threshold was 140/90, and the older cutoff would have produced a much smaller count.
Why So Many Cases Go Unmanaged
High blood pressure earns its reputation as a “silent” condition because it rarely causes noticeable symptoms until serious damage has already occurred. Many people walk around with elevated readings for years without knowing it. In the U.S., a significant portion of adults with hypertension are either unaware of their diagnosis or aware but not achieving adequate control through medication and lifestyle changes.
Globally, the picture is worse. The WHO estimates that fewer than half of adults with hypertension worldwide have been diagnosed, and only about one in five has the condition under control. That gap between prevalence and treatment is one of the largest missed opportunities in preventive medicine, because high blood pressure is a leading contributor to heart attack, stroke, kidney failure, and premature death.
What Drives These Numbers
Several overlapping factors explain why hypertension is so widespread. Diets high in sodium are a major contributor. The average American consumes about 3,400 milligrams of sodium per day, well above the recommended limit of 2,300 mg. Most of that sodium comes from processed and restaurant foods rather than the salt shaker at home.
Physical inactivity, excess body weight, heavy alcohol use, and chronic stress all raise blood pressure independently. When they overlap, the effect compounds. Genetics also matter. If one or both of your parents had high blood pressure, your own risk is significantly higher, though lifestyle choices can offset much of that inherited risk.
Population aging is pushing the numbers higher every year. As people live longer in both developed and developing countries, the pool of adults old enough to develop hypertension keeps growing. Urbanization in low-income countries is accelerating the trend by shifting diets toward processed foods and reducing physical activity.
The Scale of Health Consequences
High blood pressure is the single largest risk factor for cardiovascular disease worldwide. It damages arteries gradually, making them stiffer and more prone to plaque buildup. Over time, the heart has to work harder to pump blood through narrowed vessels, which can lead to heart failure. In the brain, weakened arteries can rupture or become blocked, causing a stroke. In the kidneys, damaged blood vessels impair the organs’ ability to filter waste, eventually leading to chronic kidney disease.
Because nearly half of U.S. adults meet the criteria, hypertension touches almost every family. The good news is that even modest reductions in blood pressure, on the order of 5 to 10 mmHg, substantially lower the risk of heart attack and stroke. Regular monitoring, dietary changes (particularly cutting sodium and increasing potassium-rich foods), consistent exercise, maintaining a healthy weight, and medication when needed can bring most cases under control.