The disease may be silent, but the work of controlling it is not.
Each year on May 17th, the world is invited to reckon with a disease that harms in silence — hypertension, the invisible architect of stroke, heart failure, and premature death. In Portugal, where more than four in ten adults carry this condition, cardiologist Paulo Dinis is challenging the medical consensus: the threshold of 140/90mmHg that European guidelines treat as the boundary of danger is, he argues, already too late. The evidence now points toward 120/70mmHg as the truer frontier of risk, and the distance between those two numbers is measured not in mercury, but in lives.
- Hypertension kills without warning — no pain, no signal — and by the time symptoms surface, organs may already bear the cost of years of silent damage.
- Over 41% of Portugal's population lives above safe pressure thresholds, yet the European guideline of 140/90mmHg leaves a dangerous grey zone where harm accumulates unaddressed.
- A leading Portuguese cardiologist is pressing for a lower target of 120/70mmHg, aligning with emerging evidence and moving closer to the stricter American standard of 130/80mmHg.
- Accurate diagnosis demands more than a single clinic reading — ambulatory monitoring and home measurements are essential to uncover masked and white-coat hypertension hiding in plain sight.
- The path forward runs through daily life first: 150 to 300 minutes of weekly aerobic exercise, salt reduction, weight control, and alcohol elimination before medication enters the equation.
- When lifestyle alone falls short, anti-hypertensive medication and sustained clinical engagement become the long-term architecture of protection — a commitment measured in decades, not appointments.
Every May 17th, World Hypertension Day draws attention to a disease that moves through populations almost undetected. Hypertension produces no symptoms for years, and by the time a person feels anything, the damage may already be done. Paulo Dinis, a cardiologist with the Cardiovascular Risk Studies Group at the Portuguese Society of Cardiology, is using this year's occasion to challenge the targets medicine has accepted as adequate.
The scale of the problem is difficult to overstate. Roughly one in three adults worldwide — and more than 41% in Portugal — lives with high blood pressure. It remains the single most modifiable risk factor for stroke, heart attack, and heart failure, yet most of those affected feel nothing at all. Dinis argues that the European guideline threshold of 140/90mmHg is insufficient: evidence now shows that readings above 120/70mmHg already indicate elevated cardiovascular risk. American guidelines have already moved lower, classifying hypertension from 130/80mmHg upward. The gap between these standards is not merely numerical — it determines who gets diagnosed and what is asked of them.
Because the disease is silent, diagnosis cannot rest on a single clinic visit. Ambulatory monitoring and home readings are essential to detect masked hypertension — where pressure runs high in daily life but appears normal in the office — and white-coat hypertension, where clinical anxiety inflates the numbers artificially.
Prevention begins with how people live. The evidence supports 150 to 300 minutes of aerobic activity per week, combined with strength and flexibility training. Salt reduction, weight control, a diet rich in vegetables and fiber, eliminating alcohol, quitting smoking, and sleeping adequately all contribute meaningfully to lowering pressure. When these changes prove insufficient, medication and sustained medical oversight become necessary — not to hit a number, but to reduce risk as far as possible without compromising daily function. Controlling this disease is quiet work, but it is never finished.
Every May 17th, the world pauses to acknowledge a disease that moves through populations almost unnoticed. Hypertension—high blood pressure—kills quietly. It produces no symptoms for years, sometimes decades, and by the time a person feels anything at all, the damage may already be done. Paulo Dinis, a cardiologist and member of the Cardiovascular Risk Studies Group at the Portuguese Society of Cardiology, has spent his career watching this disease unfold across his patients' lives. On this year's World Hypertension Day, he is sounding an alarm about the targets we have accepted as safe.
The numbers are staggering. Globally, roughly one in three adults—about 34 percent of the population—lives with hypertension. In Portugal, the figure climbs higher: more than 41 percent. This is not a marginal health concern. Hypertension remains the single most modifiable risk factor for the diseases that kill the most people in developed countries: stroke, heart attack, heart failure. It drives up mortality and morbidity across entire populations, yet most people with it feel nothing at all.
The problem, Dinis argues, lies in where we have drawn the line. European medical guidelines define hypertension as blood pressure readings of 140/90 millimeters of mercury or higher. But that threshold, he warns, is not low enough. The evidence now shows that readings above 120/70 mmHg already signal elevated cardiovascular risk. Most people should aim for values below 120/70—what doctors call normotension. American guidelines have already moved the bar lower, classifying hypertension at 130/80 mmHg and above. The difference matters: it changes how many people are diagnosed, and more importantly, it changes what we ask them to do about it.
The disease's silence is its danger. A person can have dangerously high blood pressure and experience nothing—no headaches, no chest pain, no warning at all. When symptoms do appear, they are often vague: headaches, irritability, heart palpitations, a general sense of malaise. This is why diagnosis cannot rely on a single office visit. A doctor must combine readings taken in the clinic with measurements taken outside it, using ambulatory blood pressure monitoring and home readings recorded by the patient themselves. Only this way can physicians catch the hidden forms of the disease: masked hypertension, where readings look normal in the doctor's office but run high in daily life, and white-coat hypertension, where the opposite occurs—anxiety in the clinic inflates the numbers.
Prevention must start early and focus first on how people live. Regular physical activity is among the most effective interventions. The target is 150 to 300 minutes per week of aerobic exercise—whatever form brings the person pleasure, whether walking, running, cycling, or swimming—performed consistently. This should be paired with flexibility and strength training. Equally important is salt reduction or replacement with potassium-enriched salt, which contains less sodium chloride. Weight control, a diet rich in vegetables, fruits, and fiber, the elimination or sharp reduction of alcohol, lower sugar intake, not smoking, and adequate sleep all contribute to bringing pressure down.
When lifestyle changes alone are insufficient—and for many people they are—medication becomes necessary. Anti-hypertensive drugs, medical monitoring, and careful attention to whether patients actually take their medications and follow their doctors' advice form the second line of defense. The goal is not to hit a number on a chart. The goal is to reduce pressure as low as reasonably achievable without causing dizziness, orthostatic hypotension, or weakness. It is a balance between protection and livability, and it requires both the person with hypertension and the doctor treating them to stay engaged over years, sometimes decades. The disease may be silent, but the work of controlling it is not.
Notable Quotes
The goal is to reduce pressure as low as reasonably achievable without causing dizziness, orthostatic hypotension, or weakness.— Paulo Dinis, cardiologist
The Hearth Conversation Another angle on the story
Why does the European guideline of 140/90 feel so entrenched if the evidence points lower?
Because it was established when we had less data, and changing guidelines means reclassifying millions of people as sick. There's institutional inertia, and also—honestly—cost. More diagnoses mean more treatment, more monitoring.
But you're saying the damage happens before someone hits 140?
Yes. The cardiovascular system is already under stress at 120 to 140. We're just not calling it hypertension yet. We call it elevated. But elevated is already risky.
So someone could feel completely fine and still be at risk?
That's the whole problem. Hypertension is a silent disease. You feel fine right up until you have a stroke or a heart attack. That's why we can't rely on symptoms.
How do you get someone to take medication for something they can't feel?
That's the hardest part of the job. You have to convince them that the invisible threat is real. Home blood pressure monitoring helps—when people see their own numbers, it becomes concrete.
Is lifestyle change enough for most people?
For some, yes. But most people need medication eventually. The lifestyle changes are essential, but they're rarely sufficient on their own to get pressure low enough.
What should someone do right now, today?
Get your blood pressure checked outside the doctor's office. Buy a home monitor. Start moving your body regularly. Reduce salt. And if your numbers are above 120/70, don't wait for symptoms—talk to a doctor about what comes next.