What Is Considered High Blood Pressure? Understanding the Numbers
You’ve probably had your blood pressure checked at some point — maybe during a GP visit or a health check — but how often do we stop to truly understand what those numbers mean? At Fermanagh Clinics, we see many patients who are unsure whether their readings are healthy, borderline, or something to be concerned about.
This guide will walk you through the basics of blood pressure readings, what’s considered high, and what steps you should take if your numbers are raised. We’ll also explore a common question: does high blood pressure make you tired— and what to do if fatigue might be a sign of something more.
What Do Blood Pressure Numbers Mean?
Blood pressure is measured in two numbers and expressed as millimetres of mercury (mmHg). For example, you may see a reading written as 120/80 mmHg.
Here’s what those numbers represent:
Systolic pressure (the top number): The pressure when your heart beats and pushes blood through your arteries.
Diastolic pressure (the bottom number): The pressure when your heart is resting between beats.
Both numbers are important, and even if only one is high, it could mean you have hypertension (high blood pressure).
Blood Pressure Categories
Below is a guide to help interpret your readings:

What If Your Reading Is Borderline?
A borderline or “high-normal” reading doesn’t mean you have high blood pressure yet — but it could be a warning sign that your levels are creeping up. This is the ideal time to make lifestyle changes to prevent it from progressing. These may include reducing salt intake, exercising regularly, cutting down on alcohol, managing stress, and maintaining a healthy weight.
At Fermanagh Clinics, we offer blood pressure reviews and lifestyle consultations to help you reduce your risk of developing long-term hypertension.
Does High Blood Pressure Make You Tired?
One question we’re often asked is: does high blood pressure make you tired?
While high blood pressure doesn’t usually cause obvious symptoms, fatigue can occur in some cases — especially if the condition is longstanding or poorly managed. Here’s why you might feel more tired than usual:
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–> Your heart has to work harder to pump blood, leading to physical fatigue
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–> Certain blood pressure medications (especially beta blockers) can cause drowsiness as a side effect
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–> Chronic high blood pressure can lead to reduced oxygen delivery to the body and brain
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–> It may contribute to sleep problems such as sleep apnoea
However, it’s important not to jump to conclusions. Tiredness can be caused by many other factors — from stress and diet to anaemia or thyroid issues. If fatigue is affecting your daily life, it’s worth booking a consultation for a full health review.
When Should You Be Concerned?
You should seek medical advice if:
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–> Your reading is consistently above 140/90 mmHg
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–> You’ve had a single very high reading (e.g. 160/100 mmHg or more)
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–> You’re experiencing persistent headaches, dizziness, blurred vision, chest pain or fatigue
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–> You have a family history of heart disease or stroke
We recommend 24-hour ambulatory blood pressure monitoring if your clinic readings are borderline or vary significantly. This gives a more accurate picture of your average blood pressure throughout the day and night.

How Fermanagh Clinics Can Help
At Fermanagh Clinics, we offer a complete range of blood pressure services, including in-clinic blood pressure checks, 24-hour monitoring, lifestyle advice and medication reviews, and referrals to your GP or specialist services where needed.
We’re here to help you understand your numbers and take control of your health before problems develop.
Take Charge of Your Heart Health
Blood pressure may not always come with obvious symptoms, but it plays a crucial role in your long-term wellbeing. Whether you’re curious about your own readings or simply want peace of mind, our team at Fermanagh Clinics is ready to support you. Get in touch today.
If you’ve been feeling more tired than usual, or wondering does high blood pressure make you tired, we encourage you to book a consultation. We’ll work with you to find answers — and make a plan for better health.
This blog was written on behalf of Fermanagh Clinics by Pharmacy Mentor.
