In the pharmacy queue, a blood pressure cuff lies on the counter, almost abandoned. Someone stops, out of curiosity, convinced that everything is fine with their heart. No shortness of breath, no pain, no alarm signals. And yet, behind this apparent calm sometimes lies a time bomb. Every year in France, this disease strikes one in three adults without warning, eventually taking tens of thousands of lives. How can a condition so invisible carry such weight in the country's mortality statistics? The answer lies in a word that many are not familiar with: hypertension. Hypertension, or high blood pressure, affects 17 million French people, or one in three adults, often without any visible symptoms. It is responsible for more than 55,000 deaths and up to 500,000 hospitalizations per year in France. It increases the risks of stroke, heart attack, kidney failure, heart failure, and dementia. Hypertension, this threat that never announces its name, is often called a silent killer because it progresses without noticeable symptoms. Its main talent, if one can call it that, is its discretion. No characteristic pain, no unusual fatigue, nothing that would raise suspicion. Only hypertensive crises, when the numbers rise above 200 mmHg, cause visible symptoms. In the meantime, the disease progresses quietly, year after year, without ever being noticed. For the first time, Santé publique France, a public health agency, has published a study precisely quantifying the real weight of this disease in the country. The findings are clear: hypertension would be responsible for more than 55,000 deaths in 2021 and 400,000 hospitalizations. Some estimates even mention up to 500,000 hospitalizations related to this condition each year, or 8.5% of all deaths in France. On a global scale, hypertension would be involved in eight million deaths each year, including these famous 55,000 French people. In other words, almost one in ten deaths in the country would be linked, closely or distantly, to poorly controlled blood pressure. Heart, kidneys, brain: a killer with multiple faces. Claire Mounier-Vehier, a cardiologist at the University Hospital of Lille, summarizes the situation well by referring to a true "silent killer." And for good reason, hypertension does not attack only the heart. It also weakens the kidneys and increases the risk of certain neurodegenerative diseases. Among the most feared complications are: strokes (cerebrovascular accidents), dementia disorders, myocardial infarction, heart failure, and kidney failure. Faced with this worrying picture, screening operations have existed in pharmacies and supermarkets since 2019. However, the results remain modest: only 5,000 people have been able to benefit from them, due to a lack of personnel mobilized. Nevertheless, the results are revealing: more than 30% of those screened had high readings, and 7% had never had their blood pressure checked in their lives. At a recent conference of the French Society of Hypertension, specialists have even warned about a care that tends to be deteriorating in France, a paradox at a time when screening tools do exist. Faced with this finding, vigilance remains the best available weapon. Regularly monitoring blood pressure, adopting an appropriate lifestyle, and consulting as soon as the first risk factors appear often allow avoiding the worst. A simple cuff, a few minutes, and perhaps a life saved: prevention has never seemed so accessible, provided it is no longer neglected.