You have two numbers and no idea what they mean. Worse, you searched them and found an American page telling you that 134 over 86 is Stage 1 hypertension, while your doctor in Lagos looked at the same figures and said your pressure was fine.
Both are right, which is the confusing part. A normal blood pressure reading is defined differently in Nigeria and in the United States, and almost nothing written online explains that. This guide gives you the classification your own doctor actually uses, explains what each number measures, and tells you what to do at every level.
What counts as a normal blood pressure reading in Nigeria
Nigeria’s national guidelines for the prevention and management of hypertension, covering 2023 to 2028, classify office readings like this.
Category
Systolic (top)
Diastolic (bottom)
Optimal
Below 120
Below 80
Normal
Below 130
Below 85
High normal
130 to 139
80 to 89
Grade 1 hypertension
140 to 159
90 to 99
Grade 2 hypertension
160 to 179
100 to 109
Grade 3 hypertension
180 or above
110 or above
Two rules govern how to read that table.
First, if the two numbers fall in different rows, the higher row wins. A reading of 128 over 92 is Grade 1 hypertension, not normal, because the diastolic decides it.
Second, one reading diagnoses nothing. The Nigerian guideline requires readings of 140 over 90 or above on two different days before hypertension is diagnosed. A single high number at a wedding or after a Lagos commute is not a diagnosis.
Why a normal blood pressure reading differs between Nigeria and America
In August 2025 the American Heart Association and American College of Cardiology published a revised guideline with different cut-offs. Under it, normal is below 120 over 80, elevated is 120 to 129 systolic, Stage 1 hypertension starts at 130 over 80, and Stage 2 at 140 over 90. The treatment target is below 130 over 80 for every adult.
So the same reading of 134 over 86 is high normal in Nigeria and Stage 1 hypertension in America. Nothing about your arteries changed. The label did.
Which one applies to you
Your doctor’s guideline applies to you, and in Nigeria that means diagnosis at 140 over 90, with a treatment target below 140 over 90 for most people and below 130 over 80 if you have diabetes, kidney disease or established cardiovascular disease.
The difference is not academic. Researchers applied both definitions to a Lagos cohort of just over 3,000 adults surveyed in 2017. Under the American thresholds, the number who would qualify for blood pressure medication rose by 46 percent, and the share of treated patients counted as controlled fell from 19.4 percent to 10.7 percent. One urban sample is not the whole country, but the direction is clear enough. Moving the line reclassifies enormous numbers of people overnight.
What to do with a high normal reading
This is where the two guidelines actually agree, and it is the useful part. A reading between 130 and 139 over 80 to 89 is not a crisis and usually does not mean tablets in Nigeria. It does mean you are on a trajectory, and it is the cheapest moment to change it.
Salt, weight, alcohol and activity move numbers in this range meaningfully. Cooking changes alone can be worth several points. Start there, keep measuring, and see your doctor rather than waiting to cross a threshold.
What the two numbers in your reading actually mean
Systolic, the top number
Systolic pressure is the force in your arteries at the moment your heart contracts and pushes blood out. It is the higher of the two and the one that rises with age as arteries stiffen. After about 50, it is the number that predicts stroke and heart attack most strongly.
Diastolic, the bottom number
Diastolic pressure is the force remaining while the heart relaxes and refills between beats. It matters most in younger adults, and a high diastolic in your thirties or forties deserves attention even when the top number looks acceptable.
Pulse pressure, the gap between them
Subtract the bottom number from the top. That gap is your pulse pressure, and it normally sits around 40 to 50. A persistently wide gap, above roughly 60, suggests stiffened arteries and carries risk of its own. Mention it to your doctor rather than trying to treat it yourself.
The third number on the screen is not blood pressure
Most digital monitors display a pulse reading alongside the two pressures. That is your heart rate, usually 60 to 100 beats per minute at rest. It is useful information, but it is not part of a normal blood pressure reading and a high pulse does not mean high pressure.
A normal blood pressure reading at home uses a lower cut-off
Home readings run slightly lower than clinic readings, because the clinic itself raises your pressure. So the thresholds shift.
The Nigerian guideline treats a home average of 135 over 85 or above as the hypertensive range, and asks for at least 12 measurements: duplicate readings morning and evening across three days. That is the standard your doctor should be judging you against, not a single reading taken once.
Numbers only mean something when they are taken properly. A cuff over a sleeve, an unsupported arm or a skipped five minutes of rest can add tens of points and turn a normal blood pressure reading into a false diagnosis.
What your result actually calls for
Once you know whether you have a normal blood pressure reading or something above it, the action follows directly.
Your average reading
Category
What it calls for
Below 120 over 80
Optimal
Recheck yearly. Nothing else.
120 to 129 over 80 to 84
Normal
Recheck yearly, keep salt and weight in view.
130 to 139 over 80 to 89
High normal
Lifestyle changes now, recheck in weeks, see your doctor.
140 to 159 over 90 to 99
Grade 1
Confirm on a second day, then see your doctor. Treatment likely.
160 to 179 over 100 to 109
Grade 2
See your doctor this week. Treatment almost certain.
180 or above, or 110 or above
Grade 3
Same day medical attention.
When a reading is an emergency
A reading of 180 over 110 or higher needs attention the same day. Rest for five minutes and repeat it first, because a badly taken measurement is still the commonest explanation for a number like that.
Go to a hospital immediately, whatever the number, if a high reading comes with any of these:
Chest pain or tightness
Difficulty breathing
Sudden severe headache, or a change in vision
Weakness or numbness in the face, arm or leg, especially on one side
Slurred speech or sudden confusion
The last two are stroke signs, and there every minute counts.
What about readings that are too low
Below about 90 over 60 counts as low. On its own, in someone who feels well, that is usually nothing. Combined with dizziness on standing, fainting, blurred vision or unusual fatigue, it needs a conversation, particularly if you take blood pressure medication, because it can mean your dose is now too high.
Common questions
Is 130 over 80 a normal blood pressure reading?
In Nigeria it falls in the high normal band rather than the hypertensive one, so it is not a diagnosis. American guidance calls the same figure Stage 1 hypertension. Either way it is a signal to act on salt, weight and activity, and to keep measuring.
Is 140 over 90 high?
Yes. That is the diagnostic threshold in Nigeria, confirmed on readings from two different days. It usually means treatment, and it is not a number to watch quietly for another year.
Does blood pressure rise naturally with age, so should my target be higher?
Systolic pressure does tend to rise with age because arteries stiffen. That makes it common, not harmless, and the risk it carries is the same at 70 as at 40. Your doctor may individualise your target, particularly if you are frail or prone to falls, but age alone does not license a high reading.
My two arms give different numbers. Which is correct?
A small difference is normal. Use the arm that reads higher for all future measurements, and mention a persistent difference of more than about 15 points to your doctor, because it occasionally points to a circulation problem.
Can one reading diagnose hypertension?
No. Nigerian guidance requires elevated readings on two different days, and home monitoring calls for 12 readings over three days. Judge yourself on averages, never on the worst number you have ever seen.
My reading is normal now. Can I stop my tablets?
No, and this is the single most common mistake in Nigerian hypertension care. A normal blood pressure reading on treatment is evidence the treatment is working, not evidence that you no longer need it. Any reduction is a decision for your doctor, taken gradually and with monitoring.
One normal blood pressure reading is a number, a pattern is information
A normal blood pressure reading on Tuesday morning tells you about Tuesday morning. What changes your outcome is the average over weeks, measured the same way each time and written down, then handed to someone qualified to act on it.
The other half is keeping treatment steady once it starts. Only about 12.4 percent of Nigerians with hypertension have it controlled, and the commonest reason is not the wrong drug. It is a supply that ran out on a Thursday and never got refilled.
That is HubPharm Africa’s work. We source verified medicines, deliver them across Nigeria, coordinate refills so treatment never lapses, and put a pharmacist on the phone when a reading worries you. Across our programmes we have seen a 42 percent improvement in medication adherence.
Know your numbers, then keep the supply behind them steady.
Written by Fawzi Rufai, Medically reviewed by Pharm. Sesan Kareem, B.Pharm, MPA, MBA.
This article is for general information and does not replace advice from your own doctor or pharmacist. Never start, change or stop medication based on a reading you took at home.
References
Federal Ministry of Health, Nigeria, Guidelines for the Prevention and Management of Hypertension in Nigeria, 2023 to 2028.
2025 AHA/ACC/AANP/AAPA/ABC/ACCP/ACPM/AGS/AMA/ASPC/NMA/PCNA Guideline for the Prevention, Detection, Evaluation and Management of High Blood Pressure in Adults. Journal of the American College of Cardiology, 2025.
Implications of the 2025 AHA/ACC hypertension guideline on hypertension prevalence, treatment eligibility and blood pressure control in Nigeria: a cross-sectional comparative study.
Prevalence, Awareness, Treatment and Control of Hypertension in Nigeria: Data from a Nationwide Survey 2017. Global Heart.
World Health Organization, HEARTS technical package for cardiovascular disease management in primary health care.
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