12 Common Blood Pressure Myths — And the Truth Behind Them

Nearly half of all adults have high blood pressure. In Australia alone, 2 in 5 people aged 18 and over, or 7.2 million Australians — are living with hypertension. And it doesn't discriminate much by gender either, affecting 40% of males and 39% of females in roughly equal measure.

Yet most people either don't know it, don't take it seriously, or are operating on information that is just plain wrong. That's the real danger with hypertension. It's not just the condition itself — it's the cloud of myths surrounding it that stops people from acting. The belief that you'd feel it if something was wrong. That it's an old person's problem. That being on medication means you're sorted. These assumptions feel reasonable. They're also costing people their health. 

Here are 12 of the most common blood pressure myths — and what the evidence actually says.

Myth 1: "I'd feel it if my blood pressure was high"

The fact: High blood pressure rarely causes any symptoms at all — and by the time it does, serious damage may already be underway.

This is probably the most dangerous myth on the list, because it feels so logical. We're wired to trust our bodies. If something were seriously wrong, surely we'd know about it? With high blood pressure, that instinct will let you down.

Most people with dangerously elevated blood pressure feel completely normal — going about their day, sleeping fine, showing no outward signs whatsoever. That's exactly why it earned the nickname "the silent killer."

The damage, however, is anything but silent. Over time, persistently high blood pressure puts constant strain on the walls of your arteries, quietly increasing your risk of heart attack, stroke, kidney disease, and vision loss — often over years, before a single symptom appears. For many people, the first sign that something was wrong is the cardiovascular event itself.

This is why routine screening matters so much. You cannot rely on how you feel. A blood pressure check takes less than two minutes and can be done at your GP, most pharmacies, or even at home with a validated monitor.

Myth 2: "Anything close to 120/80 is fine"

The fact: What counts as "normal" has specific ranges — and understanding where your reading actually sits on that scale matters more than simply being "close" to a familiar number. 

For a long time, 120/80 was held up as the gold standard. And while it remains a healthy target, the thinking around what sits just above it has changed significantly. 

For most adults, a healthy or ‘normal’ blood pressure reading is generally considered to be under 130/85 mmHg. The table below shows the common blood pressure categories used in Australia. 

Source: Healthdirect

Myth 3: “High blood pressure is an older person’s problem”

The fact: It’s true that high blood pressure becomes more common as we age — but that does not mean younger and middle-aged adults are in the clear.

High blood pressure can develop well before retirement age, and it often builds quietly over time. In fact, Australian data from the Australian Institute of Health & Welfare (AIHW) shows hypertension affects around 39% of people aged 45–54 and 57% of people aged 55–64. That means many people are already dealing with high blood pressure during their working years, family years and midlife — not just in older age.

The concern is that younger adults may be less likely to know their blood pressure is high, or to have it well controlled. Among Australians living with hypertension, control rates were much lower in younger adults, with only around 18% of those aged 18–34 having their condition under control with medication, compared with around 49% of those aged 75 and over.

There are several reasons high blood pressure can affect people earlier in life. Stress, poor sleep, high-salt diets, processed foods, alcohol, smoking, sedentary lifestyles, weight changes and family history can all play a role. Genetics can also increase risk, even in people who otherwise feel healthy.

Myth 4: “If I’m on medication, I’m protected”

The fact: Blood pressure medication can be extremely important, but taking medication does not automatically mean your blood pressure is fully controlled.

For some people, medication helps bring blood pressure into a healthier range. For others, their readings may still remain higher than recommended, even while taking prescribed treatment. This can happen for many reasons, including missed doses, needing a different dose or medication combination, other health conditions, stress, diet, weight, alcohol intake, poor sleep, or lifestyle factors that continue to place pressure on the cardiovascular system.

The same Australian data shows that among people living with hypertension, only an estimated 40% had their condition under control while taking antihypertensive medication. This is a reminder that medication is important, but it still needs to be monitored to make sure it is working as intended.

Some people may also have what is known as resistant hypertension. This is when blood pressure remains high despite treatment, often requiring closer medical review and a combination of approaches. It does not mean treatment has failed — it means the body may need more support, more regular monitoring, or adjustments guided by a healthcare professional.

Lifestyle changes still matter, even when medication is prescribed. Eating a balanced diet, reducing excess salt, moving regularly, limiting alcohol, managing stress, improving sleep and not smoking can all help support blood pressure control.

Myth 5: "Salt is the only dietary culprit"

The fact: Salt is often the first thing people think of when it comes to high blood pressure — and for good reason. Eating too much salt can contribute to higher blood pressure, and reducing salt intake is one of the most effective dietary steps for supporting heart health.

But salt is not the only part of the diet that matters. Here are some of the factors that may contribute to hypertension:

1. Hidden sodium in processed foods

Many packaged and processed foods contain hidden sodium, even if they do not taste particularly salty. Foods like processed meats, instant noodles, takeaway meals, frozen meals, sauces, snacks and canned soups can all contribute to higher sodium intake.

2. Added sugar

Sugar can also play a role indirectly. Diets high in added sugar may contribute to weight gain, insulin resistance and inflammation, which can all place extra strain on the heart and blood vessels over time.

Read related article: Why Blood Sugar Spikes Are Ageing You Faster (And How Protein Helps)

3. Not enough potassium-rich foods

Potassium helps balance the effects of sodium and supports healthy blood vessel function. Many people do not get enough potassium-rich foods, such as vegetables, fruit, legumes and wholegrains.

However, people with kidney disease or those on certain medications should speak with a healthcare professional before increasing potassium.

4. Alcohol intake

Alcohol can also raise blood pressure, especially when consumed regularly or in larger amounts. For some people, cutting back on alcohol can make a noticeable difference to blood pressure control.

Myth 6: “Coffee permanently raises your blood pressure”

The fact: Caffeine can cause a short-term rise in blood pressure, especially in people who do not drink it regularly or who are more sensitive to caffeine. This happens because caffeine can stimulate the nervous system, making the heart work harder for a short period and affecting how blood vessels relax or narrow.

However, this temporary spike does not necessarily mean coffee causes long-term high blood pressure in most people. A review published in Vascular Health and Risk Management suggests that people who drink coffee regularly may develop some tolerance to caffeine’s blood pressure effects, meaning the short-term spike may become less noticeable over time, but current evidence does not strongly support a link between long-term coffee drinking and increased blood pressure.

Myth 7: "Low blood pressure is always safe"

The fact: High blood pressure gets most of the attention, but very low blood pressure can also be a problem for some people.

Low blood pressure, also called hypotension, does not always cause symptoms. Some people naturally have lower readings and feel completely well. In those cases, it may not be a concern. However, if blood pressure drops too low for your body, it may mean the brain and other organs are not getting enough blood flow.

This can lead to symptoms such as dizziness, light-headedness, blurred vision, weakness, fatigue, nausea or fainting.

Low blood pressure can sometimes happen because of dehydration, blood loss, certain medications, heart problems, infection, pregnancy or other underlying health issues. It can also occur when someone stands up too quickly after sitting or lying down, which is known as postural or orthostatic hypotension.

This is especially important for older adults, as dizziness or fainting can increase the risk of falls and injury. It can also be concerning if low readings happen regularly, appear suddenly, or come with symptoms such as chest pain, shortness of breath, confusion, fainting or weakness.

If you regularly feel dizzy, faint, weak or light-headed, or your readings are unusually low for you, it is worth speaking with a healthcare professional.

Myth 8: “Once it’s controlled, you can stop medication”

The fact: Seeing your blood pressure improve is a great sign, but it does not always mean the underlying issue has gone away. In many cases, blood pressure is controlled because the treatment plan is working — not because medication is no longer needed.

Stopping blood pressure medication suddenly, or changing the dose without medical guidance, can cause readings to rise again. For some people, this may happen quickly. It can also increase the risk of complications, especially if blood pressure becomes high again without obvious symptoms.

This is why blood pressure medication should never be stopped or adjusted without speaking to a GP or healthcare professional first. If you want to stop taking a medicine or change the dose, it is important to speak with your GP first.

Myth 9: “White coat hypertension isn’t a real concern”

The fact: White coat hypertension happens when your blood pressure reading is higher in a medical setting, such as a GP clinic, but lower when measured at home or outside the clinic.

It is often linked to nerves, stress or feeling uncomfortable during an appointment. Because of this, some people assume it is harmless or not a “real” blood pressure issue. But it should not be dismissed completely.

Research suggests that untreated white coat hypertension may still be linked with a higher long-term risk of cardiovascular problems compared with consistently normal blood pressure. A large meta-analysis published in Annals of Internal Medicine found that untreated white coat hypertension was associated with increased risk of cardiovascular events and all-cause mortality.

Track patterns, not one-off spikes

If you often get high readings at the doctor’s office, keeping a record of home readings can give your GP more useful information. Doctors may ask people to check blood pressure at home morning and evening for several days, depending on their situation.

Myth 10: “Thin or fit people don’t get hypertension”

Looking healthy on the outside does not always mean blood pressure is healthy on the inside.

It is true that being physically active and maintaining a healthy weight can help reduce the risk of high blood pressure. But they do not make a person immune. Thin, fit or active people can still develop hypertension, especially if other risk factors are involved.

Family history can play a role. If high blood pressure runs in your family, your risk may be higher even if you eat well, exercise and feel healthy. The Heart Foundation lists family history, eating patterns, alcohol intake, smoking, weight and physical activity levels as factors that can increase the chance of developing high blood pressure.

Stress can also affect blood pressure. Even someone who exercises regularly may have high readings if they are under ongoing pressure, sleeping poorly, drinking more alcohol than they realise, or living with a high-stress lifestyle.

Other health conditions may also contribute. Kidney disease, diabetes and sleep apnoea are examples of conditions that can be linked with high blood pressure, and these are not always obvious based on appearance alone.

Myth 11: “Hypertension only affects the heart”

High blood pressure is often talked about as a heart health issue, but its effects can reach much further than the heart.

When blood pressure stays high over time, it can place ongoing strain on the arteries throughout the body. These arteries carry oxygen-rich blood to major organs, including the brain, kidneys and eyes. If the pressure inside those vessels remains too high, the vessel walls can become damaged, narrowed or less flexible.

It can affect the brain

High blood pressure can damage the blood vessels that supply the brain. Over time, this may increase the risk of stroke, reduced blood flow and changes in memory or thinking. The CDC notes that high blood pressure can harm organs including the brain and is linked with problems such as stroke, cognitive decline and dementia.

Research has also strengthened the focus on the link between blood pressure and brain health. Persistent high blood pressure, particularly in midlife, has been associated with a higher risk of dementia later in life, especially vascular dementia.

It can affect the kidneys

The kidneys filter waste and excess fluid from the blood. To do this properly, they need healthy blood vessels. High blood pressure can damage the arteries around the kidneys, making it harder for them to filter blood effectively. Kidney disease or kidney failure is one of the possible long-term effects of uncontrolled high blood pressure.

It can affect the eyes

The eyes also rely on tiny, delicate blood vessels. When blood pressure is too high for too long, these vessels can become strained or damaged. This may contribute to vision problems or, in more serious cases, vision loss.

It can affect arteries throughout the body

High blood pressure can also damage arteries beyond the heart. Over time, it can make arteries less elastic and contribute to plaque build-up, narrowing and reduced blood flow. This can affect circulation throughout the body and increase the risk of conditions such as peripheral artery disease.

Myth 12: “Home blood pressure monitors aren’t accurate”

Home blood pressure monitors can be accurate and useful — as long as you choose the right device and use it correctly.

In fact, home monitoring is increasingly used alongside clinic readings because it can provide a better picture of blood pressure over time. A single reading at the doctor’s office is only one snapshot, while home monitoring can show patterns across different days, times and situations.

The key is choosing a validated monitor. A validated blood pressure monitor is one that has been independently tested for accuracy against recognised standards.

What to look for when buying a home blood pressure monitor

When choosing a blood pressure monitor, look for:

• A device that has been clinically validated for accuracy

• An upper-arm cuff rather than a wrist monitor, unless advised otherwise

• The correct cuff size for your arm

• Easy-to-read results

• Memory storage or app connectivity if you want to track readings over time

• Clear instructions for correct positioning and use

Conclusion: Don’t guess — check and monitor your blood pressure

Blood pressure is one of those health numbers that many people know about, but not everyone fully understands. And because high blood pressure often has no obvious symptoms, it is easy for myths and assumptions to get in the way.

You might feel perfectly fine and still have high blood pressure. You might be young, fit, or taking medication and still need regular checks. You might also have readings that change depending on stress, sleep, caffeine, diet, medication, or whether you are at home or in a clinic.

The key message is simple: blood pressure is not something to guess. It is something to check, track and discuss with a healthcare professional.

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