High blood pressure is one of the most common health problems in the world, yet many people do not know they have it.
Also called hypertension, it develops when blood pushes against artery walls with too much force over a long period.
Blood pressure naturally rises and falls during the day.
The problem begins when it stays too high, because this can slowly damage blood vessels and increase the risk of heart attack, stroke, heart failure, kidney disease, and other serious problems.
For most people, there is no single cause. Instead, high blood pressure usually develops from a mix of inherited risk, aging, diet, body weight, physical activity, and other parts of daily life.
Family history can matter. Scientists have identified many genetic differences linked to blood pressure, so people with parents or close relatives who have hypertension may face a higher risk themselves.
Genes, however, do not decide everything. Lifestyle can strongly influence whether high blood pressure develops and how difficult it is to control.
Salt is an important example. Too much sodium can cause the body to hold extra fluid, increasing the amount of blood moving through the blood vessels and raising pressure in some people.
Much of the sodium people eat does not come from the salt shaker. It is often hidden in processed foods, restaurant meals, sauces, breads, snacks, and packaged foods.
A healthier eating pattern can help. Diets rich in vegetables, fruits, whole grains, beans, nuts, and other nutritious foods are linked to better blood pressure control, and the well-studied DASH eating plan was designed specifically to support heart health.
Body weight also matters because a larger body generally requires the heart to pump blood through more tissue. For people who are overweight, even modest weight loss can sometimes help lower blood pressure.
Regular physical activity provides another layer of protection. Exercise strengthens the heart, supports healthy blood vessels, helps control weight, and can reduce stress.
Stress can cause temporary jumps in blood pressure by making the heart beat faster and blood vessels tighten. Researchers are still studying exactly how long-term stress affects hypertension, but stress can also encourage habits such as poor sleep, overeating, smoking, or heavy drinking that make blood pressure harder to manage.
Smoking damages blood vessels and sharply increases cardiovascular risk. Drinking too much alcohol can also raise blood pressure, so reducing alcohol intake may help some people.
Sometimes hypertension develops because of another medical problem. Kidney disease, sleep apnea, hormone disorders, and some other conditions can raise blood pressure, while certain medicines and drugs can also contribute.
Age is another major factor because arteries tend to become stiffer over time. Blood pressure patterns also differ among population groups because of a complex mix of social, environmental, economic, healthcare, and biological influences rather than one simple explanation based on race alone.
Because hypertension often causes no obvious symptoms, measuring blood pressure is the only reliable way to know whether it is high. Regular checks become especially important as people get older or develop other risk factors.
The good news is that high blood pressure can often be prevented or controlled. Eating well, staying active, maintaining a healthy weight, avoiding smoking, limiting alcohol, and taking prescribed medicines when needed can greatly reduce the danger.
Research on hypertension and its prevention has been published widely in major medical journals, including Hypertension, The Lancet, and the Journal of the American College of Cardiology. Decades of research show that controlling blood pressure is one of the most effective ways to protect the heart, brain, kidneys, and blood vessels.
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