High Blood Pressure Singapore: Symptoms, Causes & Treatment

High blood pressure is common in Singapore, but many people who have it feel completely well.

This makes hypertension easy to overlook. A person may have persistently high readings for years before experiencing an obvious problem. During that time, the additional pressure can gradually damage blood vessels and increase the risk of stroke, heart attack, heart failure, kidney disease and visual problems.

According to Singapore's National Population Health Survey 2024, hypertension affected 33.8% of Singapore residents in 2023–2024 — approximately one in three people. The prevalence remained high despite increasing public awareness of chronic disease prevention.

For patients concerned about high blood pressure in Singapore, the most important facts are:

• Hypertension usually causes no symptoms.

• One unusual reading does not always confirm hypertension.

• Repeated clinic or home readings are usually needed.

• Clinic blood pressure of 140/90 mmHg or higher is considered hypertension under Singapore guidance.

• A home average of 135/85 mmHg or higher is considered abnormal.

• Very high blood pressure accompanied by chest pain, breathlessness, weakness, confusion or visual changes may be a medical emergency.

Early detection allows high blood pressure to be managed before complications develop.

High Blood Pressure Singapore: Key Facts at a Glance

What Is High Blood Pressure?

Blood pressure is the force exerted by circulating blood against the walls of the arteries.

A blood pressure result contains two numbers. For example: 138/86 mmHg.

The first number is the systolic blood pressure. It measures the pressure inside the arteries when the heart contracts and pumps blood.

The second number is the diastolic blood pressure. It measures the pressure inside the arteries while the heart is relaxing between beats.

Persistently increased pressure places strain on the heart and blood vessels. Over time, this can contribute to narrowing and stiffening of the arteries and damage to organs such as the brain, heart, kidneys and eyes.

Blood pressure categories used in Singapore

Singapore's primary-care hypertension protocol classifies clinic readings as follows:

A diagnosis is generally made when systolic blood pressure is persistently at least 140 mmHg, diastolic blood pressure is persistently at least 90 mmHg, or both. Home readings tend to be lower, so Singapore guidance uses 135/85 mmHg as the corresponding home threshold.

What does "persistently" mean?

Blood pressure naturally varies throughout the day. It can rise temporarily because of physical activity, emotional stress, pain, poor sleep, caffeine, nicotine, a full bladder, talking during the measurement, anxiety in a medical setting, or using a cuff that is too small.

Singapore guidance recommends averaging at least two seated readings and repeating measurements on at least two separate occasions before diagnosing hypertension, unless the reading is dangerously high or there are signs of an acute complication.

What Are the Symptoms of High Blood Pressure?

Most people have no symptoms

Hypertension is often called a "silent" condition because most patients do not feel that their blood pressure is elevated.

A person can have readings of 150/95 mmHg or higher and still feel normal. Conversely, someone with a headache or dizziness may have normal blood pressure.

The only reliable way to know whether you have hypertension is to measure your blood pressure properly.

Do not wait for symptoms before getting checked

By the time symptoms develop, blood pressure may be extremely elevated or complications may already have occurred.

Regular measurements are especially important for people who:

• Are aged 40 or older

• Have a family history of hypertension

• Have diabetes or high cholesterol

• Have kidney disease

• Are overweight

• Smoke

• Have obstructive sleep apnoea

• Previously had high readings

• Take medication that can raise blood pressure

Symptoms that may occur when blood pressure is extremely high

Very high blood pressure can sometimes be associated with severe headache, blurred or altered vision, dizziness, chest pain, shortness of breath, nausea or vomiting, confusion, weakness or numbness, difficulty speaking, or an irregular heartbeat.

These symptoms are not specific to hypertension and may indicate a heart attack, stroke or another serious condition. They should not be dismissed as "just high blood pressure".

Does high blood pressure cause headaches?

Ordinary hypertension usually does not cause headaches.

A headache can temporarily raise blood pressure because pain and anxiety stimulate the nervous system. This means that a high reading taken during a migraine, fever or painful illness does not automatically mean the blood pressure caused the headache.

However, a sudden severe headache together with very high blood pressure, confusion, weakness, difficulty speaking or visual changes requires urgent medical assessment.

Does high blood pressure cause dizziness?

Mild or moderate hypertension is not a common explanation for dizziness.

Dizziness may instead arise from dehydration, low blood sugar, an inner-ear problem, anaemia, anxiety, abnormal heart rhythm or blood pressure that falls when standing.

People already taking hypertension medication may experience dizziness if their pressure becomes too low, particularly after standing up. Medication should not be stopped independently; the dosage and readings should be reviewed by a doctor.

What Causes High Blood Pressure?

There are two main categories: primary hypertension and secondary hypertension.

Primary hypertension

Most adults have primary, or essential, hypertension. This means that there is no single identifiable disease causing the high blood pressure.

Instead, it develops gradually through a combination of ageing, genetics, lifestyle and metabolic factors. Common contributors include family history, increasing age, excess dietary sodium, excess body weight, physical inactivity, smoking, regular or excessive alcohol intake, poor sleep, chronic stress, diabetes, high cholesterol and arterial stiffness.

Primary hypertension usually develops over many years.

Why salt matters particularly in Singapore

Singapore diets can be high in sodium because salt is present not only in table salt, but also in sauces, seasoning powders, soups, gravies, preserved foods, processed meat and instant noodles.

The National Nutrition Survey 2022 found that nine in ten Singapore residents consumed more than the recommended 2,000 mg of sodium per day. Average intake was approximately twice the recommended limit. The survey identified salt, sauces, seasonings and instant noodles as major local sources.

Common high-sodium foods may include fishball or minced-meat noodles with soup, laksa and curry gravy, economic rice with multiple sauces, instant noodles, processed meat, salted fish, preserved vegetables, soy sauce and oyster sauce, stock cubes and seasoning powders, fast food, and packaged snacks.

This does not mean that patients must avoid all local food. Practical changes such as requesting less gravy, drinking less soup, choosing fresh foods more often and reducing added sauces can meaningfully lower sodium intake.

Age and family history

Arteries tend to become stiffer with age, which can cause systolic pressure to rise even when diastolic pressure remains normal. This is known as isolated systolic hypertension.

Genetics also matter. People with parents or siblings who developed hypertension — particularly at a younger age — may have a greater likelihood of developing it themselves. A family history is not a guarantee that someone will become hypertensive, but it makes regular screening more important.

Weight, insulin resistance and sleep apnoea

Excess weight can increase the amount of blood the body must circulate and influence hormones that regulate sodium, fluid balance and blood-vessel tone.

Obstructive sleep apnoea may repeatedly reduce oxygen levels during sleep and activate stress pathways that raise blood pressure. It should be considered particularly in patients who snore loudly, wake unrefreshed, experience daytime sleepiness or have hypertension that remains difficult to control. Singapore's clinical guidance includes obstructive sleep apnoea among recognised secondary contributors to hypertension.

Secondary Hypertension: When Another Condition Is Responsible

Secondary hypertension means that the high blood pressure is caused by an identifiable medical condition, medicine or substance.

Doctors may suspect it when hypertension begins at an unusually young age, appears suddenly, is extremely high, worsens rapidly, does not respond to several medications, is accompanied by low potassium, occurs with unusual symptoms, or was previously controlled but becomes difficult to manage.

Recognised causes include kidney disease, narrowing of the arteries supplying the kidneys, primary aldosteronism, thyroid disorders, Cushing's syndrome, phaeochromocytoma, obstructive sleep apnoea and certain congenital heart conditions.

Medicines and substances that can raise blood pressure

Some prescription and non-prescription products may increase blood pressure or make existing hypertension harder to control. Examples include non-steroidal anti-inflammatory drugs (such as some painkillers), corticosteroids, oral contraceptive pills, certain cold and flu decongestants, some weight-loss or stimulant products, sympathomimetic medication, liquorice-containing products, illicit stimulants and excessive alcohol.

Singapore's ACE guidance specifically lists oral contraceptives, NSAIDs, steroids, decongestants and diet pills among possible causes of secondary hypertension.

Do not stop prescribed medication without medical advice. Instead, show your doctor or pharmacist a complete list of medicines, supplements and traditional remedies that you use.

Why Untreated High Blood Pressure Is Dangerous

Hypertension does not usually cause immediate discomfort, but its cumulative effects can be serious.

Stroke. High blood pressure can damage and weaken blood vessels in the brain. This increases the risk of both blocked-artery strokes and bleeding within the brain.

Heart attack and coronary artery disease. Hypertension accelerates damage to artery walls and contributes to atherosclerosis. This can reduce blood flow to the heart and increase the risk of angina and heart attack. You can read more about coronary artery disease and how it develops.

Heart failure. The heart must pump against greater resistance when blood pressure is high. Over time, the heart muscle can thicken, stiffen or weaken, eventually causing heart failure.

Kidney disease. The kidneys contain networks of small blood vessels that filter the blood. Persistent hypertension can damage these vessels and reduce kidney function. Kidney disease can then further raise blood pressure, creating a harmful cycle.

Eye damage. Hypertension can damage the small vessels supplying the retina, potentially causing blurred vision or loss of vision.

Cognitive decline. Long-term vascular damage may affect blood flow within the brain and is associated with increased risk of cognitive impairment.

Controlling hypertension reduces the risk of cardiovascular and kidney complications.

When Should You See a Doctor for High Blood Pressure?

Make a routine appointment if readings are repeatedly high

Arrange a GP review if:

• Clinic or pharmacy readings are repeatedly at least 140/90 mmHg

• Home readings average at least 135/85 mmHg

• Your readings are 130–139/85–89 mmHg and you have cardiovascular risk factors

• Your blood pressure has increased noticeably from its usual level

• You are younger than 30 and have repeated high readings

• You are pregnant or planning pregnancy

• You have diabetes, kidney disease or known heart disease

• You have started a medicine that may raise blood pressure

• You are already on treatment but readings remain above your agreed target

A reading of 130–139/85–89 mmHg is classified as high-normal rather than hypertension under Singapore guidance. However, it still warrants lifestyle intervention and cardiovascular-risk assessment, particularly in people with diabetes, kidney disease, previous stroke or heart disease.

Arrange an earlier review for readings of 160/100 mmHg or above

Repeated readings from 160/100 mmHg indicate at least Grade 2 hypertension under Singapore guidance.

These readings should not be ignored for months simply because you feel well. Earlier medical review is appropriate because medication may be required and the doctor may need to check for organ damage or an underlying cause. Patients with readings of at least 160/100 mmHg are among those for whom Singapore guidance recommends more frequent follow-up.

When Is High Blood Pressure an Emergency?

A hypertensive emergency occurs when severely elevated blood pressure is accompanied by evidence that an organ is being acutely damaged.

Singapore guidance describes this as high blood pressure — often above 180/110 mmHg — together with signs or symptoms of acute organ dysfunction.

Call 995 for emergency assistance if very high blood pressure occurs with:

• Chest pain

• Severe shortness of breath

• Sudden weakness or numbness

• Facial drooping

• Difficulty speaking

• Confusion or reduced alertness

• Sudden major change in vision

• A severe, unusual headache

• Collapse or loss of consciousness

• Seizure

International emergency guidance commonly uses a reading above 180/120 mmHg together with symptoms such as chest pain, breathlessness, weakness, visual changes or difficulty speaking as a hypertensive emergency. In Singapore, call 995 when there are symptoms suggesting a heart attack, stroke or other life-threatening complication.

Do not drive yourself if you are experiencing symptoms of a stroke, heart attack or severe breathlessness.

What if the reading is above 180/110 but there are no symptoms?

Sit quietly and repeat the measurement after several minutes using correct technique.

If it remains extremely high, seek prompt medical advice even if you feel normal. Severe hypertension without symptoms may not require an emergency ambulance in every case, but it still needs timely medical assessment and should not be left until a routine appointment several weeks later.

Do not take extra tablets unless a doctor has previously given you a specific plan for doing so. Lowering blood pressure too quickly without supervision may be harmful.

How to Measure Blood Pressure Accurately at Home

Home monitoring can help confirm whether hypertension is present and show whether treatment is working. It can also identify white-coat hypertension (readings are high in the clinic but lower at home) and masked hypertension (clinic readings appear acceptable but readings outside the clinic are high).

Singapore guidance recognises home monitoring as useful for following trends, improving treatment decisions and distinguishing white-coat from masked hypertension.

Before measuring

• Avoid measuring immediately after exercise.

• Empty your bladder.

• Sit and rest quietly for at least three to five minutes.

• Do not talk or use your phone during the measurement.

• Support your back.

• Keep both feet flat on the floor.

• Do not cross your legs.

• Rest the arm on a table at approximately heart level.

During the measurement

Use a validated automatic upper-arm monitor with the correct cuff size.

Take two readings, approximately two minutes apart, and record the average. If the first two differ by at least 5 mmHg, take additional readings and calculate the average. Singapore guidance recommends repeating measurements on at least two separate occasions.

Keep a record

Record the date and time, systolic reading, diastolic reading, heart rate, whether you had taken your medication, and any relevant symptoms.

Bring the monitor and records to your appointment. Your doctor may compare your machine against the clinic equipment and check whether the cuff fits correctly.

Why Can Blood Pressure Be High at the Clinic but Normal at Home?

White-coat hypertension

Some patients become anxious during medical appointments, temporarily raising their blood pressure.

White-coat hypertension does not always require immediate medication, but it should not simply be dismissed. Patients may still need home monitoring and assessment of overall cardiovascular risk.

Masked hypertension

Masked hypertension is the reverse. Clinic readings appear normal, but blood pressure is elevated at home, at work or overnight.

It may occur in people who smoke, experience significant workplace stress, have sleep apnoea, kidney disease or other cardiovascular risks. Ambulatory blood pressure monitoring, which records readings over 24 hours, may help clarify uncertain cases.

How Is High Blood Pressure Diagnosed?

A doctor will usually begin by reviewing multiple blood pressure readings, home or ambulatory readings, age and family history, diet and sodium intake, weight and waist measurement, exercise pattern, smoking and alcohol use, current medication, symptoms of sleep apnoea, diabetes and cholesterol history, and any kidney, thyroid or hormonal symptoms.

The doctor will also assess the patient's overall risk of heart disease and stroke rather than treating the blood-pressure figure in isolation. Singapore guidance recommends cardiovascular-risk assessment for patients with elevated readings.

Tests that may be recommended

Depending on the patient, the assessment may include kidney-function blood tests, sodium and potassium levels, fasting glucose or HbA1c, a cholesterol profile, a urine test for protein or albumin, an electrocardiogram, thyroid testing, examination of the eyes, additional hormonal or kidney investigations, and sleep-apnoea assessment.

These tests help identify cardiovascular risk, possible organ damage and secondary causes of hypertension. Not every patient requires every test. Investigation should be tailored to age, medical history, blood-pressure severity and clinical findings.

How Is High Blood Pressure Treated in Singapore?

Treatment generally involves lifestyle measures, medication or a combination of both. The correct approach depends on how high the readings are, overall cardiovascular risk, age and frailty, diabetes, kidney disease, previous heart attack or stroke, evidence of organ damage, medication tolerance, pregnancy status and patient preferences.

Singapore guidance recommends personalised targets rather than applying one identical target to everyone. Patients at high cardiovascular risk are often considered for a clinic target below 130/80 mmHg if tolerated, while a target below 140/90 mmHg may be appropriate for patients at lower risk. Less stringent targets may be considered for some frail or very elderly patients.

Lifestyle treatment

Recommended measures include reducing sodium intake, losing excess weight where appropriate, exercising regularly, stopping smoking, limiting alcohol, eating more vegetables, fruit, whole grains and minimally processed foods, treating sleep apnoea, improving sleep, and taking medication consistently.

Singapore's hypertension care protocol specifically recommends regular exercise, smoking cessation, weight reduction and reduced sodium and alcohol intake. Lifestyle changes are worthwhile even when medication is needed. They can improve general health and may reduce the number or dose of medicines required.

Blood-pressure medication

Common medication classes include angiotensin-converting enzyme (ACE) inhibitors, angiotensin receptor blockers, calcium-channel blockers, thiazide or thiazide-like diuretics, beta blockers in selected patients, and other medicines for resistant or complicated hypertension.

Singapore's ACE guidance identifies an ACE inhibitor, angiotensin receptor blocker or calcium-channel blocker as usual first-line options, with thiazide or thiazide-like diuretics considered where appropriate. The choice depends on age, kidney function, other conditions, side-effect risks and potential pregnancy. Some patients need two or more medicines because different drug classes work through different mechanisms.

Do not stop medication because your readings become normal

A normal reading while taking medication usually means that the treatment is working. It does not necessarily mean the hypertension has disappeared.

Stopping tablets abruptly can allow blood pressure to rise again. Some medicines may also cause additional problems if discontinued suddenly. Discuss side effects, low readings or a desire to reduce medication with your doctor. Doses can often be adjusted safely.

Frequently Asked Questions

Is 140/90 mmHg high blood pressure in Singapore?

Yes. Under current Singapore guidance, persistent clinic blood pressure of at least 140/90 mmHg is classified as hypertension. Home measurements use a lower threshold of 135/85 mmHg.

Is 130/80 mmHg normal?

A reading below 130/85 mmHg is classified as normal by Singapore's primary-care protocol. However, the ideal target depends on age, health conditions and whether the person is already receiving treatment.

Can stress cause permanent high blood pressure?

Stress can temporarily raise blood pressure. Chronic stress may also contribute indirectly through poor sleep, reduced exercise, overeating, smoking or alcohol. Repeated readings outside stressful situations are needed to determine whether persistent hypertension is present.

Can a young person have high blood pressure?

Yes. Although hypertension is more common with increasing age, younger adults can develop it. Secondary causes are considered more strongly when significant hypertension develops before age 30. Singapore guidance lists patients younger than 30 among those who may warrant specialist assessment.

Can thin people develop hypertension?

Yes. Excess weight raises risk, but genetics, age, kidney disease, sleep apnoea, medication, hormonal conditions and high sodium intake can cause hypertension in people of any body size.

Is high blood pressure caused by anxiety?

Anxiety may temporarily raise a reading and contribute to white-coat hypertension. Persistent hypertension should not automatically be attributed to anxiety without home monitoring or further assessment.

Can hypertension be cured?

Secondary hypertension may improve if the underlying cause is treated. Primary hypertension is usually a long-term condition, although weight loss, sodium reduction, exercise and other changes may substantially improve control.

Should I check my blood pressure every day?

Daily monitoring may be useful when hypertension is newly diagnosed, treatment has changed or your doctor is assessing control. Once readings are stable, less frequent monitoring may be sufficient. The schedule should be personalised.

Which arm should I use?

A doctor may initially measure both arms. Thereafter, the arm with the consistently higher reading is often used for monitoring. Use the same arm and similar conditions each time for better comparison.

Can I rely on a smartwatch to diagnose hypertension?

Wearable devices may be useful for general tracking, but they should not replace a validated upper-arm monitor or clinical assessment unless the specific device has been appropriately validated for blood-pressure measurement.

The Bottom Line

High blood pressure is extremely common in Singapore, affecting approximately one in three residents. Yet most people with hypertension experience no clear symptoms.

The practical thresholds to remember are:

• Clinic BP below 130/85 mmHg: normal under Singapore guidance

• Clinic BP 130–139/85–89 mmHg: high-normal

• Clinic BP at least 140/90 mmHg: hypertension

• Home average at least 135/85 mmHg: hypertension

• BP around or above 180/110–120 mmHg with serious symptoms: seek emergency help

One high reading is not always a diagnosis, but repeated elevated readings should not be ignored.

See a doctor if your blood pressure is consistently high, particularly if you have diabetes, kidney disease, high cholesterol, excess weight, sleep apnoea or a family history of cardiovascular disease.

Call 995 when very high blood pressure occurs with chest pain, severe breathlessness, weakness, difficulty speaking, confusion, collapse or sudden visual changes.

Hypertension can be controlled. Detecting it before symptoms or complications develop is one of the most effective ways to protect the heart, brain and kidneys.

High Blood Pressure Assessment at Nee Soon Clinic

Nee Soon Clinic provides evaluation and follow-up for high blood pressure and hypertension. A consultation may include repeat blood-pressure measurement, review of home readings, cardiovascular-risk assessment, diabetes and cholesterol screening, kidney-function evaluation, review of medication and supplements, assessment for possible secondary causes, lifestyle and dietary guidance, prescription and adjustment of blood-pressure medication, and long-term monitoring.

Patients may bring their home blood-pressure monitor and recorded readings to the appointment for review. Persistent high blood pressure should be medically assessed even when there are no symptoms.

References

1. National Population Health Survey 2024 (Singapore). 2025.

2. Primary Care Pages Singapore. Chronic Care Protocol: Hypertension. Updated January 2026.

3. Agency for Care Effectiveness. Hypertension: Tailoring the Management Plan to Optimise Blood Pressure Control. 2023.

4. SingHealth. Hypertension: Symptoms, causes, diagnosis and treatment.

5. World Health Organization. Hypertension fact sheet. Updated 2025.

6. American Heart Association. Signs, symptoms and emergency thresholds for high blood pressure. Updated 2025.

7. Singapore Civil Defence Force. Emergency Medical Services.

Disclaimer:The information provided in this article is for informational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. The content is not intended to be a comprehensive source of information and should not be relied upon as such. Reliance on any information provided in this article is solely at your own risk. The authors and the publisher do not endorse or recommend any specific tests, physicians, products, procedures, opinions, or other information that may be mentioned in the article. Any reliance on the information in this article is solely at the reader's own risk.