Understanding Your Blood Pressure Numbers

✓ Medically reviewed by a licensed Canadian pharmacist · Updated July 4, 2026

You are sitting on the couch, cuff still snug on your arm, staring at the screen: 138 over 86. Two numbers, no explanation. Is that bad? Should you worry? And why did your pharmacist just tell you the rules changed?

Here is the short version. The top number is the pressure when your heart beats. The bottom number is the pressure between beats. And yes, the target really did move: in 2025, Canada simplified its guidance, so a lot of the advice floating around online is now out of date.

So a single 138/86 is worth paying attention to, but it is not a diagnosis and it is not an emergency. Let's walk through what your numbers actually mean, calmly and honestly.

In this article

• What the top and bottom numbers actually are
• The target moved in 2025
• Where does your number fall?
• Does the top or bottom number matter more?
• What about the pulse reading?
• What to actually do with your numbers
• Frequently asked questions

The number on the screen is a starting point, not a verdict. What it means depends on how you measured and what your other readings look like.

What the top and bottom numbers actually are

Blood pressure is written as two numbers because your heart does two things: it squeezes, then it relaxes. Each phase puts a different amount of pressure on your artery walls.

The top number, systolic, is the higher of the two. It is the pressure at the moment your heart contracts and pushes blood out. The bottom number, diastolic, is the pressure between beats, when your heart is refilling and resting.

Think of it like a garden hose. When you turn the tap fully on, the pressure inside spikes: that is your systolic. When you ease the tap back but water is still sitting in the hose, there is still pressure there: that is your diastolic. Your arteries are never empty, so the bottom number is never zero.

Both numbers matter, and neither one on its own tells the whole story. A reading of 138/86 means 138 when the heart beats, 86 in between. Perfectly normal to see, worth understanding, not worth panicking over.

The target moved in 2025

Here is why your pharmacist said the rules changed. For years, Canadian guidance used a tiered system with several categories and different cut-offs depending on your age and risk. It was accurate, but it was also confusing, and plenty of people never knew which threshold applied to them.

In 2025, Hypertension Canada simplified things. There is now one clear line for most adults: 130/80 mmHg or higher, confirmed with repeated proper readings, is hypertension. That is it. No separate chart to hunt through.

What does that mean for you in practice? Three things:

• More people qualify. The old threshold sat higher, so numbers that once looked borderline now land inside the hypertension range.
• Conversations happen earlier. That is a good thing. Catching rising pressure sooner means gentler, simpler steps.
• Your home readings count. A diagnosis can be made from properly measured readings at home, not just in the clinic. Your monitor is part of the picture now, which is exactly why measuring well matters.

So if you read something online that says 140/90 is the cut-off, it is simply working from the older numbers. The current Canadian line is 130/80.

Where does your number fall?

Here is the simplified 2025 picture at a glance. Remember that these apply to an average of proper readings, not a single number caught after a stressful commute.

One more thing that surprises people: your numbers at the clinic can run 10 to 20 points higher than at home, purely from the stress of being in a medical setting. It is so common it has a name.

This "white coat" effect is one of the strongest arguments for measuring at home. Your living room readings, taken calmly over several days, often give your provider a truer picture than a single tense reading at the front desk. If you want to get those home readings right, our guide on how to take an accurate reading at home walks through the technique step by step.

Does the top or bottom number matter more?

The honest answer: both. If either number is consistently above the threshold, it counts, and neither one gets a free pass.

That said, there is a pattern worth knowing. In younger adults, the diastolic (bottom) number often draws attention. As we age, arteries stiffen, and the systolic (top) number tends to become the one clinicians watch most closely. So with age, the top number usually earns a bit more of the spotlight.

But do not talk yourself into ignoring a high bottom number because you read that "systolic matters more." That advice is about emphasis, not permission. If your average sits at or above 130/80 on either figure, it is worth a conversation.

A reading of 116/78, comfortably in the normal band from the table above. Both numbers below the line means there is nothing to chase here.

What about the pulse reading?

Your monitor usually shows a third, smaller number: your pulse, in beats per minute. It is a nice bonus, but it is a different measurement from your blood pressure, and it is easy to confuse the two.

Pulse tells you how fast your heart is beating. Blood pressure tells you how hard your blood is pushing against your artery walls. A number can be high or low on one and perfectly ordinary on the other. A brisk pulse after climbing the stairs does not mean your blood pressure is high.

What the pulse reading is not is a substitute for a proper heart rhythm check. If your monitor flags an irregular heartbeat now and then, mention it to your provider, but do not use the pulse number to diagnose anything on your own.

What to actually do with your numbers

You have the numbers. Now the calm, practical part. Four steps, in order:

• Measure properly. Five quiet minutes first, back supported, feet flat on the floor, arm supported at heart level, and no talking, phone, or caffeine beforehand. Poor technique is the single most common reason readings look scary.
• Take three and average. Take three readings, one minute apart, and use the average. A single number is weather. The average is climate.
• Log it. Same times each day, morning and evening, for about a week before an appointment. Our guide on reading your blood pressure log like your doctor does shows what your provider is actually looking for.
• Talk to your provider. Bring your log. Together you decide what your numbers mean and what, if anything, to do about them.

One firm line: do not adjust any medication on your own based on a home reading, ever. Readings inform the conversation with your provider. They do not replace it.

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Frequently asked questions

What is a normal blood pressure by age?

Here is the honest answer: the 2025 Hypertension Canada guidance does not use a separate chart by age for most adults. The same 130/80 threshold applies across the board. There are exceptions, particularly for frailty in older adults, where a provider may set different targets, but that is a personalized conversation, not a lookup table. If you have seen an "ideal by age" chart online, it is usually based on the older, tiered approach. Below 120/80 is the normal zone for most adults, whatever your age.

Is 140/90 high now?

Yes. Under the current Canadian guidance, hypertension starts at 130/80, so 140/90 sits clearly above the line. It is worth confirming with an average of proper readings rather than a single measurement, and then bringing that log to your provider. It is not an emergency on its own, but it is a number to act on rather than ignore.

Which number is more important, the top or the bottom?

Both count, and either one being consistently high matters. The general pattern is that the bottom (diastolic) number often gets more attention in younger adults, and the top (systolic) number becomes the main focus as arteries stiffen with age. But neither number gets a free pass at any age.

What should my blood pressure be in the morning?

The same thresholds apply in the morning as any other time: below 120/80 is normal, and 130/80 or higher on average signals hypertension. Blood pressure naturally varies through the day, which is exactly why you measure at the same times, morning and evening, over about a week. Take your morning reading before medication and coffee, sit quietly for five minutes first, and average three readings.

Can blood pressure be too low?

It can, though for most people a lower reading is a good thing. Low blood pressure only tends to matter when it causes symptoms like dizziness, light-headedness, or feeling faint, especially when standing up. If your readings run low and you feel fine, there is usually nothing to chase. If low numbers come with symptoms, mention it to your provider.

Once you understand your numbers, the next step is living well with them day to day. Our guide on living well with high blood pressure at home covers the practical habits that move the needle.

This article is for general education only and is not medical advice. Always work with your healthcare provider on your blood pressure targets and treatment.