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HIGH BLOOD PRESSURE SERIES · ARTICLE 2 OF 12
The silent killer problem
Stage 1, Stage 2, and how to know if you have it.
In article 1 we said that about one in three South African adults is living with high blood pressure, and that roughly half of them don’t know it. That second fact is the bigger problem. The condition does most of its damage in the years before anyone gets diagnosed — quietly, invisibly, with no symptoms to warn you that something is wrong.
This article is about closing that gap. What Stage 1 and Stage 2 actually mean for your body. The two kinds of “hidden” hypertension that catch even careful people out. Who should be testing younger and more often than the average adult. And what to do, calmly, on the day you find out you have it.
If you remember nothing else
Get your blood pressure measured at a clinic or pharmacy this week. It takes one minute. It is free. It is the single most useful health check you can do as an adult.
Why it is called “silent”
High blood pressure does not hurt. There is no nerve in the artery wall that says, “the pressure inside me is too high today”. The body simply keeps doing its job, even when the pressure inside the pipes is slowly stiffening and scarring them.
This is why the diagnosis usually comes one of three ways:
• A routine check at a clinic. Someone goes in for a flu, for contraception, for an antenatal visit, for a chronic medication refill — and the nurse picks it up.
• An employer or pharmacy wellness screen. A free check at a Clicks counter or a workplace wellness day shows a number that someone else thinks is worth investigating.
• An event. A stroke. A heart attack. A bad heart palpitation. A diabetic complication. By this stage, BP has often been high for ten years or more.
The first two are how we want it to happen. The third is what we are trying to prevent. The problem is that the only way to swing the odds toward the first two is to actively go and get tested.
You cannot wait for your body to tell you. Your body will not tell you until it is too late.
Stage 1 and Stage 2, in plain language
Article 1 gave you the full table of categories. Here we focus on the two stages of actual high BP — what they mean clinically, and what they mean for your day-to-day life.
Stage 1: 130 – 139 over 80 – 89
This is the early stage of high blood pressure. Most people in Stage 1 feel completely well. Their arteries are working harder than they should, but the body has not yet started complaining about the damage.
What it means in practice:
• Your risk of stroke, heart attack and kidney disease has gone up. Not dramatically — but measurably.
• For most people in this stage, the first treatment is lifestyle — less salt, more walking, less alcohol, weight loss if needed, better sleep. We will cover each of these later in the series.
• If lifestyle changes do not bring the BP down within three to six months, or if you also have diabetes, kidney disease, or a history of heart trouble, your clinic will likely start medication.
• The numbers should be re-checked every three to six months until they stabilise.
Stage 1 is the easiest place to be diagnosed. The damage is still small. The fixes are still cheap. The body is still responsive. Almost everyone diagnosed at Stage 1 who actually does the work brings their BP back into the normal range.
Stage 2: 140 / 90 or higher
This is established high blood pressure. The arteries have been working harder for longer. The risk numbers are now noticeably worse.
What it means in practice:
• Lifestyle still matters — enormously — but on its own it is usually not enough.
• Most people in Stage 2 will be started on medication straight away, often with two different tablets at low doses rather than one tablet at a high dose. This combination approach is gentler and more effective.
• You will likely have your kidneys, cholesterol and blood sugar tested at the same time, because the same body that develops Stage 2 BP often has other things going on.
• Re-check is monthly until the BP is under control, then every three to six months for life.
Stage 2 is not a disaster. It is a clear signal that the body needs help. With the right combination of medication and ordinary lifestyle work, the numbers come down — usually within a few weeks of starting treatment.
The target most South African adults should aim for
For most adults: below 130 / 80.
For most adults over 65 with no other major conditions: below 140 / 80, with the lower number being the more important one to control.
For people with diabetes or kidney disease: below 130 / 80, and a doctor will often push for slightly lower if you can tolerate it.
White-coat and masked hypertension
There are two ways the clinic and the body can disagree, and both of them matter.
White-coat hypertension
Some people’s BP shoots up the moment they sit down in a clinic. The cuff goes on, the nurse leans in, the room is unfamiliar — and the body does what bodies do under stress. The reading comes out high. At home, on the couch, the same person’s BP is completely normal.
This is real. It is also more common than people realise — maybe one in five readings taken in a clinic. The way to confirm it is either a 24-hour ambulatory monitor or a few weeks of careful home readings.
The trap: people with confirmed white-coat hypertension are still at slightly higher long-term risk than people whose BP is normal both at home and at the clinic. The body that spikes under stress is the body that will spike under other stresses too. It is worth a conversation with your clinic about whether to treat it or just monitor it.
Masked hypertension
This is the opposite problem and it is much more dangerous. The BP is normal at the clinic but high everywhere else — at home, at work, while driving in traffic, while lying in bed at night.
It is most common in people who are stressed at work but relaxed at the clinic, in shift workers, in people who do not sleep enough, and in younger adults who are otherwise healthy.
The only way to find masked hypertension is to measure outside the clinic — at home, or with a 24-hour ambulatory monitor.
If your clinic readings are borderline, or if you have several risk factors but your clinic readings keep coming back fine, it is worth asking about a home monitor or a 24-hour study. A normal clinic reading does not always mean a normal blood pressure.
Who should be testing younger and more often
The general rule is: every adult should have a BP check at least every two years. Most should aim for once a year. But some groups should start younger and check more often.
If this describes you Start testing How often No risk factors, otherwise healthy From age 18 Every 2 years A parent or sibling has high BP From age 18 Every year Black South African ancestry From age 18 Every year Diabetic From diagnosis Every clinic visit Overweight, sedentary or stressed From age 18 Every year Pregnant or planning pregnancy From conception Every antenatal visit Over 40 Now Every 6 – 12 months Already on BP medication Already started Every 3 months as advised
If you are reading this and you have not had a BP check in the last year, you are overdue. There is no reasonable excuse — it is free, it is fast, it is everywhere.
What to do on the day you find out
Many people leave the clinic with a Stage 1 or Stage 2 result and feel a sudden weight drop into their chest. That is normal. Diabetes, kidney disease, dementia, stroke — those words are heavy. Here is what to do next.
1. Do not panic.
High blood pressure caught at any stage is a manageable condition. You have caught it. You can do something about it. The people who really suffer from it are the ones who do not know they have it. You now know.
2. Get a second reading on a different day.
Unless the number is very high (Stage 2 or worse) on the first visit, the clinic will want to confirm before starting any treatment. Two or three readings on separate days, ideally in different moods, give the truer picture.
3. Ask for the baseline tests.
At the second visit, ask the nurse or doctor to check your urine, your kidney function (eGFR), your cholesterol and your fasting blood sugar. These are the baseline tests that tell you where you are starting from. They are usually free as part of chronic care.
4. Get a home monitor if you can.
An upper-arm BP monitor costs about R400 to R800 at most pharmacies. It is one of the best small investments you can make in your health. We will cover how to choose one and how to use it properly in article 4.
5. Start one thing that day.
Not all the things — one thing. The most useful first moves:
• Cut your salt intake to roughly half of what you have now.
• Walk for 20 minutes before or after work, five days a week.
• Stop adding sugar to tea and coffee.
• Drop one drink off your daily alcohol intake.
Pick one. Do it for two weeks. Then add the next one.
6. Take the medication if it is prescribed.
This is the place where the most South Africans go wrong. The tablets feel unnecessary because you feel fine. You take them for a month, your BP comes down, and you stop. The BP goes back up within weeks. The artery walls keep stiffening. Ten years later, the body finally complains — and by then a lot of the damage is permanent.
If you are prescribed BP medication, take it every day, for as long as your clinic recommends, which for most people is the rest of your life. We will cover the medications, what they do, and how to handle side effects in article 9 of the series.
The “but I feel fine” trap
You will feel fine for a long time. Then you will have a stroke or a heart attack and you will not feel fine. By that point the choices have been made — years earlier — by whether or not you took your medication every day.
The bigger picture
The silent killer problem is fundamentally a knowledge problem. Most people who have high BP would do something about it if they knew. The challenge is finding out.
If this article has prompted you to get tested, that is the whole point. Tell two other people in your family to get tested as well. High BP travels through families — both genetically and culturally — and one tested person often turns into three or four.
The next article in the series is the one we placed early on purpose: the complications of untreated high BP. Stroke, heart attack, kidney disease, dementia. What each one looks like, why high BP causes it, and what’s actually reversible if you catch the BP in time.
Where to get more help
Heart and Stroke Foundation South Africa — heartfoundation.co.za · 021 422 1586 — patient information and a free heart-disease risk calculator.
Your nearest public clinic — free BP checks, chronic care registration, free medication for those who qualify.
Most retail pharmacies — Clicks, Dis-Chem, Pick n Pay — free BP checks at the counter.
Phila Today High Blood Pressure Series — next: the complications nobody wants to talk about — stroke, heart attack, kidney disease and dementia.
Phila Today · Article 2 of 12 in the High Blood Pressure Series