High Blood Pressure: Why You Can Feel Fine and Still Need to Know Your Numbers
By Dr Daniel Gordon • 11, Sept 2026
One of the things that surprises people most when I tell them their blood pressure is high is that they often feel completely well.
That's actually very common. Some people with high blood pressure don't have symptoms. You can work, exercise, sleep normally and feel perfectly healthy while your blood pressure has been higher than it should be for months or even years.
This is why I tell patients that blood pressure is a number worth knowing, rather than something you should wait to feel.
Below, I've brought together some of the most common questions I hear from patients in clinic about blood pressure, what the numbers mean and when you should be concerned.
What do your blood pressure numbers actually mean?
A blood pressure reading consists of two numbers, for example 130/80 mmHg.
The first, or systolic, number is the pressure in your arteries when your heart contracts. The second, or diastolic, number is the pressure when your heart relaxes between beats.
But I wouldn't diagnose someone with high blood pressure from one slightly raised reading.
Blood pressure naturally changes throughout the day. Stress, pain, caffeine, exercise and even feeling nervous while sitting in my consulting room can temporarily push it up.
What matters is whether your blood pressure is consistently high.
When is blood pressure considered high?
In the UK, blood pressure is generally considered high when repeated readings are:
140/90 mmHg or higher when measured by a healthcare professional
135/85 mmHg or higher when measured at home
If I find a raised reading in clinic, the next step will often be to check it properly rather than immediately label someone as having hypertension.
That might mean asking my patient to take readings at home over several days or to wear a 24-hour blood pressure monitor. This gives us a much better idea of what your blood pressure is doing during normal daily life.
Why does high blood pressure matter if you feel fine?
This is the important part.
High blood pressure makes your heart and blood vessels work harder over time. Left untreated, it can increase your risk of heart attack, stroke, heart failure, kidney disease and other health problems.
And that's why treating high blood pressure can sometimes feel strange. You may start treatment when you don't feel ill, and after treatment you may not feel noticeably different.
We're treating the future risk, not necessarily a symptom you're experiencing today.
Who is more likely to develop high blood pressure?
Anyone can develop hypertension, but there are factors that make it more likely.
Your risk tends to increase with age, and family history can be important. High blood pressure is also more common in some ethnic groups, including people from Black African and Black Caribbean backgrounds.
Lifestyle can influence blood pressure too, including:
Eating a lot of salt
Being overweight
Drinking too much alcohol
Not being physically active
Smoking
Long-term stress
But I don't like simplifying high blood pressure to simply telling someone to “live healthier”.
Sometimes genetics play a large role. Certain medical conditions and medications can affect blood pressure too. What I'm interested in is understanding why your blood pressure may be high and what we can realistically do about it.
Does high blood pressure cause headaches?
I hear this one a lot.
People often associate headaches with high blood pressure, but most people with mild hypertension don't have headaches or any other obvious symptoms.
Very high blood pressure can sometimes be associated with symptoms such as headache or blurred vision, but you can't reliably tell what your blood pressure is from how your head feels.
If you're wondering whether your blood pressure is high, measure it. Don't try to guess from symptoms.
Can you check your blood pressure at home?
Yes, and home readings can be extremely useful.
I'd generally recommend a validated upper-arm blood pressure monitor. When you take a reading:
Sit quietly for a few minutes beforehand
Keep both feet flat on the floor
Support your arm
Don't talk while the measurement is being taken
Record your results rather than trying to remember them
Don't panic over one unexpectedly high number. What your doctor would be looking for is a pattern across several readings.
If your readings are repeatedly high, arrange a review with your GP or another appropriate healthcare professional.
Can you lower blood pressure without medication?
Sometimes lifestyle changes can make a significant difference.
Reducing salt, maintaining a healthy weight, exercising regularly, stopping smoking and keeping alcohol within recommended limits can all help your overall cardiovascular health and may help lower blood pressure.
But there's an important point I make to patients: needing blood pressure medication doesn't mean you've failed.
Some people can have an excellent diet, exercise regularly, not smoke and still develop hypertension. Genetics and ageing don't disappear because you have a healthy lifestyle.
If medication is clinically indicated, lifestyle changes and treatment should work together rather than one being seen as a replacement for the other.
Why might you need more than one blood pressure tablet?
Patients sometimes worry when I suggest adding a second medication. They assume it means their blood pressure has become dramatically worse.
That's not necessarily the case.
Blood pressure is controlled through several different mechanisms in the body. Using smaller doses of two medicines that work in different ways can sometimes control it more effectively than continually increasing the dose of one.
Finding the right combination can take a little time.
Depending on your circumstances, I may also want to check your kidney function, urine, cholesterol, blood glucose and overall cardiovascular risk. Treating hypertension isn't just about getting one number down. It's about looking at the bigger picture.
When should you seek urgent medical help?
A high blood pressure reading on its own isn't always an emergency, but certain symptoms should never be ignored.
Seek urgent medical attention if you develop high blood pressure and symptoms such as chest pain that doesn't go away
Severe difficulty breathing
Sudden weakness or numbness
Difficulty speaking
Sudden loss of vision
Other symptoms that could suggest a heart attack or stroke
If you're getting unusually high blood pressure readings or developing concerning symptoms, seek medical advice rather than repeatedly checking the number at home and worrying about it.
The key takeaway
High blood pressure is common, treatable and, importantly, usually silent.
That's why I don't want people waiting for headaches, dizziness or some other warning sign before thinking about their blood pressure. Often there isn't one.
Know your numbers, particularly as you get older or if you have other cardiovascular risk factors. If your blood pressure is consistently high, get it properly assessed.
You don't need to become obsessed with every individual reading. What matters is knowing your usual range and doing something about it if that range is consistently higher than it should be.
Disclaimer
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