High blood pressure affects millions of people across the UK — and many don’t realise they have it.

The British Heart Foundation estimates that over 14 million adults are living with high blood pressure, including around 5 million who are unaware they have it. Because it rarely causes obvious symptoms, it’s often described as a “silent” condition.

But silent doesn’t mean harmless.

Over time, raised blood pressure can quietly damage blood vessels throughout the body — affecting not just the heart, but also the brain, eyes and overall wellbeing.

What high blood pressure actually does

Your blood vessels carry oxygen and nutrients to every organ. When blood pressure is consistently high, it places extra strain on those vessels.

Over time, they can become narrower, stiffer and less able to function properly. This reduces blood flow and places vital organs under pressure — often without any clear warning signs.

Your eyes: one of the earliest warning signs

The eyes contain very small, delicate blood vessels, which makes them particularly sensitive to changes in blood pressure.

When these vessels are damaged, it can affect the retina — the part of the eye responsible for clear vision. This condition, known as hypertensive retinopathy, may lead to:

• Blurred or reduced vision

• Difficulty focusing

• Visual disturbances or headaches

In more severe cases, changes to the optic nerve or retinal bleeding may occur.

However, in the early stages, many people notice no changes at all. Subtle damage is often picked up during routine eye tests before symptoms develop — another reason regular optician visits can be valuable alongside blood pressure checks.

Because the eyes reflect changes in the body’s blood vessels more broadly, vision problems linked to blood pressure should always be checked promptly.

Your brain: damage that builds quietly

The brain relies on a steady, uninterrupted blood supply. High blood pressure can interfere with this in several ways.

Over time, it increases the risk of:

• Stroke, caused by either a blockage or bleeding in the brain

• Small vessel disease, leading to tiny areas of damage that may go unnoticed at first

• Cognitive decline, including problems with memory, concentration and thinking speed

These changes often develop gradually.

Research has consistently linked high blood pressure in midlife with a higher risk of vascular dementia later in life. Clinical trial evidence also suggests that improving blood pressure control may reduce the risk of developing dementia.[4]

Sexual function: a sign often overlooked

Blood flow plays an essential role in sexual function.

When blood vessels are narrowed or less responsive, circulation can be affected — particularly in smaller vessels.

In men, this may contribute to erectile dysfunction. In some cases, it can be an early sign of underlying cardiovascular issues.

In women, reduced blood flow may be linked with:

• Lower sexual desire

• Reduced sensitivity

• Changes in sexual satisfaction

These effects are not always discussed, but they can provide useful early insight into vascular health. It’s also worth noting that some blood pressure medications can influence sexual function — either positively or negatively — so it’s always worth discussing any concerns with a GP.

Why high blood pressure is often missed

One of the biggest challenges is that high blood pressure usually has no symptoms.

Many people feel completely well, even when their readings are elevated. As a result, it is often picked up during routine checks rather than through symptoms.

The NHS recommends regular monitoring, particularly for adults over 40. Many pharmacies now offer free blood pressure checks, making it easier to stay on top of your numbers.

What you can do to bring it down

The encouraging news is that blood pressure often responds well to small, consistent changes.

1. Know your numbers

A healthy reading is typically below 140/90 mmHg. If your readings are consistently higher, it’s important to seek advice. Some people may need medication, while others can improve levels through lifestyle changes.

2. Reduce salt intake

The NHS recommends no more than 6 grams of salt per day.

Much of the salt in the UK diet comes from processed foods such as ready meals, bread and sauces. Checking labels and choosing lower-salt options can make a meaningful difference.

3. Focus on whole, balanced foods

Eating patterns rich in whole foods are consistently linked with better blood pressure control.

This includes:

• Fruit and vegetables

• Wholegrains

• Beans and legumes

• Nuts and seeds

• Healthy fats such as olive oil

These foods provide key nutrients like potassium and magnesium, which support normal blood vessel function.

4. Be mindful of alcohol

Regular alcohol intake can raise blood pressure over time. Reducing how often you drink — or keeping it occasional — can help support healthier levels.

5. Stay active (and include simple strength work)

Regular movement, such as walking, supports heart and blood vessel health.

There is also growing evidence that simple strength-based exercises — including isometric exercises like wall sits or planks — may produce modest but statistically significant reductions in blood pressure when done consistently.

Combining strength-based and aerobic activity offers the greatest overall benefit for cardiovascular health.

What this means for you

High blood pressure rarely announces itself. But the effects can build slowly — affecting vision, brain health and overall wellbeing.

The key is not to wait for symptoms.

Regular checks, combined with small, sustainable lifestyle changes, can make a meaningful difference — in some cases within weeks. Over time, these changes help reduce the risk of more serious complications.