Could Your Blood Pressure Be High Without You Knowing?

High blood pressure, also called hypertension, often causes no symptoms, even when it has been present for a long time. This is why you cannot rely on how you feel to know whether your blood pressure is normal. The only reliable way to find out is to have it measured.

For Kenyan adults, checking your blood pressure is one of the simplest ways to identify a health problem before it contributes to heart disease, stroke or kidney damage.

What is high blood pressure?

Blood pressure is the force of blood pushing against the walls of your arteries as your heart pumps.

A blood pressure reading has two numbers. For example, 128/82 mmHg.

The first number is the systolic pressure. It measures the pressure when your heart contracts.

The second number is the diastolic pressure. It measures the pressure when your heart relaxes between beats.

Kenya's 2024 clinical guidelines classify blood pressure of 140/90 mmHg or higher as hypertension, with the classification based on the higher of the systolic or diastolic readings. The goal of treatment is generally to bring blood pressure below 140/90 mmHg, although your clinician might set a different target depending on your health and other conditions.

Why can blood pressure be high without symptoms?

High blood pressure often develops gradually.

Your body adjusts to the higher pressure, so you might not notice anything different. You might still feel well while high blood pressure gradually damages blood vessels and organs.

Headaches, dizziness or nosebleeds sometimes occur, but these symptoms do not reliably tell you whether you have hypertension. Many people with hypertension have no symptoms at all.

This creates an important problem.

You might think, "I feel fine, so my blood pressure must be fine."

That assumption is unsafe.

A person who discovers high blood pressure during a routine check-up might have had it for months or years without knowing.

How is hypertension diagnosed?

A blood pressure check is quick and painless.

A health worker places a cuff around your upper arm and measures your blood pressure using a blood pressure machine or another validated device.

One high reading does not always establish a diagnosis. Blood pressure changes throughout the day and can rise temporarily because of stress, pain, physical activity, caffeine or other factors.

Kenya's 2024 clinical guidance recommends assessing blood pressure and looking for conditions or organ damage associated with hypertension. The recommended investigations can include urine testing, blood glucose, kidney function tests, a lipid profile and an ECG, depending on the clinical situation.

Your clinician might also recommend repeat measurements or measurements outside the clinic.

If you have access to a validated home blood pressure machine, keeping a record of your readings can help your clinician understand your usual blood pressure.

Who is at risk of high blood pressure?

Anyone can develop hypertension, but some factors increase your risk.

These include:

• Getting older

• Having a close family history of hypertension

• Being overweight or living with obesity

• Eating too much salt

• Not getting enough physical activity

• Drinking too much alcohol

• Smoking or using tobacco

• Having diabetes

• Having kidney disease

• Having other cardiovascular risk factors

Some risk factors are outside your control, such as age and family history. Others are modifiable, meaning changes in your daily habits can reduce your risk.

What does this look like in everyday life?

Consider a few common situations.

You might spend most of the day sitting at a desk in Nairobi, then drive home rather than walk.

You might regularly eat salty processed foods, add extra salt to meals or rely heavily on takeaway foods.

You might have a family history of hypertension and assume it is inevitable.

You might feel healthy in your 30s or 40s and have never had your blood pressure checked.

None of these situations proves you have hypertension. They are reasons to pay attention to your cardiovascular health and check your blood pressure regularly.

You do not need to wait until you feel unwell.

What problems can uncontrolled hypertension cause?

High blood pressure puts extra stress on blood vessels and organs over time.

If it remains uncontrolled, it increases the risk of:

• Stroke

• Heart attack

• Heart failure

• Kidney disease and kidney failure

• Damage to blood vessels

• Other cardiovascular disease

Hypertension can damage the heart by making it work harder. It can also damage the blood vessels supplying the brain and kidneys.

The important point is that complications often appear after the underlying blood pressure problem has been present for some time. Finding and treating hypertension early helps reduce this risk.

What should you do if your blood pressure is high?

Do not panic after a single high reading.

Instead:

1. Have your blood pressure checked again.
2. Discuss repeated high readings with a clinician.
3. Follow the recommended follow-up schedule.
4. If you receive hypertension treatment, take your medicines as prescribed.
5. Reduce excess salt in your diet.
6. Be physically active regularly, according to your health and fitness level.
7. Work towards a healthy weight if you are overweight.
8. Avoid tobacco.
9. Limit alcohol.
10. Attend follow-up appointments even when you feel well.

Kenya's 2024 clinical guidelines recommend lifestyle measures such as a healthy diet, physical activity, weight reduction and avoiding tobacco and alcohol. Medication is used when lifestyle measures alone are insufficient or when the blood pressure and overall clinical situation warrant treatment.

What does a healthier Kenyan diet look like?

You do not need expensive or specialised foods to support healthy blood pressure.

Practical choices include:

• Eat more vegetables such as sukuma wiki, spinach, cabbage and other locally available vegetables.

• Include beans, ndengu, githeri and other pulses regularly.

• Choose fruits such as bananas, oranges, pawpaw and other locally available fruits.

• Include fish, eggs, milk or other suitable protein sources.

• Choose whole or minimally processed foods more often.

• Reduce the amount of salt you add during cooking or at the table.

• Limit highly processed foods that are often high in salt.

• Watch portion sizes if you are trying to manage your weight.

You do not need to remove ugali, potatoes or other staple Kenyan foods from your diet. The overall pattern, portions and preparation matter.

What if you already take blood pressure medicine?

Keep taking your medicine as prescribed, even if you feel completely well.

Feeling better does not mean the hypertension has disappeared.

Do not stop, share or change your blood pressure medicine without discussing it with your clinician. Your treatment might need adjustment based on your blood pressure readings, other medicines, kidney function and other health conditions.

Hypertension often requires long-term monitoring and treatment.

When should you seek urgent medical care?

Very high blood pressure together with concerning symptoms requires urgent medical assessment.

Seek emergency care if you have very high blood pressure and symptoms such as:

• Severe headache

• Chest pain

• Difficulty breathing

• Confusion

• Fainting or severe weakness

• Sudden difficulty speaking

• Sudden weakness or numbness, especially on one side of the body

• Sudden vision changes

• Severe dizziness or other sudden neurological symptoms

Blood pressure around 180/120 mmHg or higher is particularly concerning, especially when accompanied by symptoms suggesting damage to the heart, brain, kidneys or other organs.

If you have symptoms of a stroke or heart attack, seek emergency medical care immediately rather than waiting for another blood pressure reading.

How often should you check your blood pressure?

The appropriate frequency depends on your age, previous readings, risk factors and whether you have been diagnosed with hypertension.

If you have never had your blood pressure checked, consider making it part of your next routine health visit.

If you already have hypertension, follow the monitoring schedule recommended by your clinician.

If you have diabetes, kidney disease, a family history of hypertension or other cardiovascular risk factors, regular monitoring is particularly important.

Key takeaways

• High blood pressure often has no symptoms.

• Feeling healthy does not prove that your blood pressure is normal.

• The only reliable way to know your blood pressure is to measure it.

• In Kenya's 2024 clinical guidance, hypertension is generally defined as blood pressure of 140/90 mmHg or higher.

• Untreated hypertension increases the risk of stroke, heart disease and kidney damage.

• Salt intake, physical inactivity, excess weight, alcohol and tobacco use can increase your risk.

• Healthy eating, regular physical activity, weight management and avoiding tobacco and excess alcohol support blood pressure control.

• If you have hypertension, take prescribed treatment and attend follow-up visits even when you feel well.

• Very high blood pressure with symptoms such as chest pain, difficulty breathing, severe headache, confusion or sudden neurological symptoms requires urgent medical care.

Frequently asked questions

Can I have high blood pressure if I feel perfectly healthy?

Yes. Most people with hypertension do not notice symptoms. Regular measurement is the only reliable way to detect it.

Does a headache mean I have high blood pressure?

Not necessarily. Headaches have many possible causes, and hypertension often has no symptoms. Do not use symptoms alone to decide whether your blood pressure is high. Have it measured.

Is 140/90 mmHg high blood pressure?

In Kenya's 2024 clinical guidance, persistent blood pressure of 140/90 mmHg or higher falls within the hypertension range. Your clinician will consider repeat readings and your overall health when confirming the diagnosis and deciding on treatment.

Can young adults have hypertension?

Yes. Age increases risk, but hypertension can affect adults at younger ages too. Family history, excess weight, physical inactivity, diet and other health conditions influence risk.

Can I lower my blood pressure without medicine?

Lifestyle changes help lower blood pressure and are part of hypertension management. Some people also need medicine. Whether you need medication depends on your blood pressure and overall health.

Should I stop my medicine if my blood pressure becomes normal?

No. A normal reading while taking treatment often means the treatment is working. Do not stop or change your medicine without speaking with your clinician.

What tests might I need after being diagnosed with hypertension?

Your clinician might recommend tests to assess your cardiovascular risk and look for kidney disease, diabetes or other complications. Kenya's 2024 guidance lists urine testing, blood glucose, full blood count, kidney function and electrolytes, lipid profile and ECG among investigations used according to the clinical situation.

Where can I have my blood pressure checked in Kenya?

You can have your blood pressure checked at a health facility or by using an appropriate home blood pressure monitor. If a reading is repeatedly high, speak with a qualified healthcare professional for assessment.

References

1. Kenya Ministry of Health. Clinical Guidelines for Management and Referral of Common Conditions at Level 4 Primary Care Hospitals, Level 5 Secondary Hospitals, Level 6 Tertiary Hospitals and National Hospitals. Volume 2024.
2. World Health Organization. Hypertension. Updated 25 September 2025.
3. World Health Organization. High blood pressure: Check it.
4. Kenya Ministry of Health. Kenya National Guidelines for Cardiovascular Diseases Management.
5. World Health Organization. Global report on hypertension 2025: High stakes: turning evidence into action.