Aug
14
Category: Cardiology | Medical Specialist: Cardiologist; emergency physician for acute symptoms | References: American Heart Association (AHA); American College of Cardiology (ACC); WHO Introduction: The Health Problem You May Not Feel Imagine feeling completely healthy, going to work, exercising occasionally, eating normally—and discovering during a routine check-up that your blood pressure is consistently high. There may be no pain, no obvious warning and no dramatic symptoms. That quiet nature is precisely what makes hypertension so important to understand. Hypertension, commonly called high blood pressure, occurs when the pressure of blood against artery walls remains persistently elevated. It affects an estimated 1.4 billion adults aged 30–79 worldwide, yet around 44% are unaware that they have it. Only about 23% are estimated to have their blood pressure under control. In other words, hypertension is not simply a number on a blood-pressure monitor. Over time, uncontrolled high blood pressure can place additional strain on the heart and blood vessels and increase the risk of stroke, heart disease, kidney disease and other complications. The encouraging part? Hypertension can often be prevented, treated and controlled. The first step is knowing your numbers and understanding what they mean. What Is Hypertension? Blood pressure is recorded using two numbers: WHO defines hypertension as blood pressure of 140/90 mmHg or higher, confirmed by measurements taken on two different days. However, blood-pressure categories and treatment thresholds can differ between clinical guidelines. The 2025 American Heart Association/American College of Cardiology guideline uses 130/80 mmHg as an important threshold for high blood pressure and sets an overall treatment goal of below 130/80 mmHg for many adults, with individual considerations for certain groups. Blood Pressure at a Glance Blood pressure reading General interpretation Below 120/80 mmHg Generally considered normal 120–129 and below 80 Elevated 130–139 or 80–89 High blood pressure under AHA/ACC classification ≥140 or ≥90 Hypertension under WHO definition >180 and/or >120 Severe hypertension requiring prompt assessment Classification systems vary, so your healthcare professional should interpret your readings in context. What Causes Hypertension? There isn’t always one obvious cause. For most adults, hypertension develops from a combination of genetic, biological, environmental and lifestyle factors. 1. Primary Hypertension Most hypertension is primary (essential) hypertension, meaning it does not have one identifiable underlying disease responsible for it. It tends to develop gradually as factors such as age, genetics, diet, body weight, physical activity and vascular changes interact over time. 2. Secondary Hypertension Sometimes high blood pressure is caused by another condition or medication. Possible contributors include: Treating the underlying cause can sometimes substantially improve blood pressure. Major Risk Factors for Hypertension Some risk factors cannot be changed, while others can. Non-Modifiable Risk Factors These include: Blood vessels naturally become less flexible with age, which can contribute to rising blood pressure. Modifiable Risk Factors This is where everyday choices can make a meaningful difference. Common contributors include: Some people are particularly sensitive to dietary sodium. Kidney disease, diabetes and metabolic syndrome can also increase vulnerability. A useful way to think about this is not “Did I cause my hypertension?”, but “Which factors can I change now?” That shift from blame to action can make hypertension much easier to manage. Symptoms of Hypertension: Why It Is Called a “Silent” Condition One of the biggest misconceptions about hypertension is that you will know when your blood pressure becomes high. Usually, you won’t. Many people with hypertension have no noticeable symptoms, even when their blood pressure has been elevated for a long time. Regular measurement is therefore much more reliable than waiting for warning signs. Some people may experience nonspecific symptoms such as: But these symptoms do not reliably diagnose hypertension. A headache, for example, does not automatically mean that your blood pressure is high. When High Blood Pressure Becomes an Emergency A reading above 180/120 mmHg requires immediate attention, particularly if it is accompanied by symptoms such as: These can indicate a hypertensive emergency or another serious medical problem. How Is Hypertension Diagnosed? A single elevated reading does not necessarily mean you have chronic hypertension. Healthcare professionals generally look for consistently elevated measurements, often using readings taken on separate occasions. Home blood-pressure monitoring can also help identify patterns that may not appear during a clinic visit. How to Get a More Accurate Reading Before measuring your blood pressure: Incorrect technique or cuff size can produce misleading results. Your clinician may also request blood and urine tests or other investigations to evaluate cardiovascular risk, identify possible secondary causes and determine whether organs such as the kidneys have been affected. Hypertension Treatment: What Actually Works? The best treatment plan depends on your blood-pressure level, overall cardiovascular risk, age, other health conditions and response to treatment. 1. Lifestyle Changes Lifestyle changes form the foundation of hypertension prevention and management. Eat for Your Blood Vessels Focus on: The DASH eating pattern is one evidence-based approach commonly recommended for blood-pressure management. Reducing heavily processed foods can be particularly useful because much of the sodium in modern diets comes from packaged and prepared foods rather than the salt shaker. Move More Regular physical activity can help lower blood pressure and improve cardiovascular fitness. You don’t necessarily need to transform your life overnight. Walking more, reducing prolonged sitting and gradually building consistent exercise habits can be more sustainable than an extreme short-term fitness plan. Maintain a Healthy Weight For people who are overweight, even modest weight loss may improve blood-pressure control and reduce cardiovascular risk. Limit Alcohol and Avoid Tobacco Excessive alcohol can contribute to elevated blood pressure, while tobacco damages blood vessels and increases cardiovascular risk. Prioritize Sleep and Stress Management Poor sleep and persistent stress can complicate blood-pressure control. Addressing sleep quality, maintaining a regular routine and using practical stress-management strategies can complement medical treatment. 2. Medicines for Hypertension Lifestyle changes are important, but they aren’t always enough. Depending on the individual situation, clinicians may prescribe medicines such as: The goal isn’t simply to take a tablet and see a lower number. Treatment aims to reduce long-term cardiovascular and organ