You had a routine blood test, or had your blood pressure checked at the pharmacy "just to see," and the number surprised you a little. You don't feel anything unusual — no headache, no dizziness, nothing — and yet you're being told you have high blood pressure. How is it possible to feel nothing in the face of something that sounds serious?
That's exactly the problem with high blood pressure, and exactly why it deserves to be properly understood.
What high blood pressure really is
Blood pressure measures the force exerted by blood against artery walls. It's expressed as two numbers: systolic (the higher number, pressure when the heart contracts) and diastolic (the lower number, pressure between beats). We talk about hypertension when these numbers stay persistently above thresholds considered normal — generally 140/90 mmHg in clinic, measured on several occasions.
What makes high blood pressure particular is that it almost never causes a symptom. The body gets used to higher pressure, and you can live for years with blood pressure that's too high without feeling anything. The problem isn't the absent sensation: it's the silent toll that this excess pressure takes, day after day, on the arteries, the heart, the kidneys, and the brain.
How a cardiologist assesses your blood pressure
A single reading is never enough to make a diagnosis. Blood pressure can spike temporarily due to stress, the medical visit itself (the "white coat effect" is real and well documented), recent exertion, or even a cup of coffee. A cardiologist relies on several readings, in several contexts: at the clinic, sometimes supplemented by a 24-hour recording (ambulatory blood pressure monitoring) or home self-monitoring with a validated device.
The interview looks for associated risk factors: weight, physical activity, salt and alcohol intake, smoking, family history, stress, sleep (the link between sleep apnea and hypertension is well established). Blood work and sometimes a urine test complete the assessment, to check that the kidneys, often involved, are working normally.
An ECG, or even a cardiac ultrasound, may be requested to assess whether the heart has already started adapting to this excess pressure — a heart pumping against too much resistance for years tends to thicken, which can eventually become a problem.
Why untreated high blood pressure is dangerous
This is where the real stakes lie. Blood pressure that's too high, sustained over time, gradually wears down:
- the arteries, which stiffen and promote the buildup of plaque (atherosclerosis);
- the heart, which has to work harder to pump blood, which can lead to heart failure over the long term;
- the kidneys, whose small blood vessels are particularly sensitive to pressure;
- the brain, with an increased risk of stroke;
- the eyes, with a risk of retinal damage.
It's precisely because this damage accumulates silently, over years, that high blood pressure is nicknamed the "silent killer." By the day it becomes apparent — heart attack, stroke, kidney failure — the damage is often already done.
Home monitoring, an underused tool
More and more cardiologists encourage their patients with high blood pressure, or at risk of it, to get a validated blood pressure monitor for home tracking. It's a simple, inexpensive tool, and often more informative than a single reading taken at the clinic.
Why it's useful: repeated measurements, at different times of day, over several days, give a far more accurate picture of your actual blood pressure than a single reading, inevitably influenced by the context of the visit. It also helps detect hypertension that only shows up outside the medical office — a phenomenon less well known than the "white coat effect," but just as real.
How to measure properly: at rest, seated for a few minutes, arm resting at heart level, having not smoked or had coffee in the previous 30 minutes. Two readings a few minutes apart, morning and evening, over several days, give a far more reliable picture than a single stressed reading in a waiting room.
What not to do with it: adjust your own treatment based on numbers observed at home, without talking to your doctor. Home tracking is an information tool to share with your cardiologist, not a substitute for their opinion.
What the research says
According to the World Health Organization, high blood pressure affects more than one in four adults worldwide, and remains one of the leading preventable risk factors for cardiovascular disease, stroke, and kidney disease. The WHO highlights a striking point: a large share of people with hypertension are unaware of their condition, for lack of screening, even though treatment — often simple, combining lifestyle measures and well-tolerated medications — significantly reduces these risks.
What actually helps lower blood pressure
A responsible cardiologist doesn't lightly prescribe medication for moderate hypertension with no other risk factor. Several levers, often combined, are recommended as a first step:
Cutting salt from your diet — note that most of the salt we consume comes from prepared and processed foods, not just the salt shaker.
Moving regularly: moderate-intensity physical activity, practiced regularly, has a demonstrated effect on lowering blood pressure.
Limiting alcohol, which raises blood pressure in a dose-dependent way.
Losing weight if overweight: even a modest loss (5 to 10% of body weight) can have a measurable effect.
Managing chronic stress and treating an untreated sleep disorder, particularly sleep apnea, which is an often-overlooked cause of high blood pressure.
When these measures aren't enough, or when blood pressure is too high from the start, medication is added — there are several drug classes, and the choice is made based on your individual profile, not a one-size-fits-all approach.
In practice, in Israel
Blood pressure screening is simple and quick, available at your family doctor, at a pharmacy, or during a cardiology visit. Follow-up and treatment for high blood pressure generally go through your health fund's covered pathway; a cardiologist's opinion is useful when blood pressure is hard to control, severe from the outset, or combined with other cardiovascular risk factors.
Blood pressure that's too high, discovered by chance or followed for a long time without being truly under control: a cardiologist's opinion lets you take stock and act before damage sets in. Find a cardiologist near you on OlamKal and book an appointment.
To wrap up
High blood pressure doesn't make noise, but it works continuously. The good news is that it's detected in seconds and treats well, often with accessible measures before medication is even considered. Feeling no symptom isn't proof that everything is fine — that's exactly why you should measure, rather than guess.
