Facts on High Blood Pressure (Hypertension)

Facts on High blood pressure (Hypertension)

As blood is pumped by the heart around the body, the pressure with which it pushes against the walls of blood vessels changes.

When the heart is squeezing blood into the arteries, the pressure is high.

When the heart is relaxed, the pressure is lower.

Your blood pressure is a measurement taken of the highest reading and the lowest reading. It is given as 2 figures — highest (systolic) over lowest (diastolic).

  • Systolic — pressure in the artery as the heart contracts. This is represented by the top, higher number.
  • Diastolic — pressure in the artery when the heart is relaxing and being filled with blood. This is represented by the bottom, lower number.

What is high blood pressure?

Your blood pressure is high if the reading is higher than 140/90 mmHg, which is considered to put you at higher risk of having a heart attack or stroke (cardiovascular disease). That is, you have high blood pressure if the higher figure (systolic) is higher than 140, or the lower figure (diastolic) is higher than 90, or both.

This is also known as hypertension. More than one third of Australians over the age of 18 have high blood pressure.

If your blood pressure is below this figure, however, you are considered to have a reduced cardiovascular risk.

There are lower blood pressure targets of below 130/80 mmHg for people with cardiovascular disease, diabetes, kidney disease and other associated clinical conditions.

Why is your blood pressure important?

Your blood pressure is important because if it is too high, it affects the blood flow to your organs. Over the years, this increases your chances of developing heart disease, strokekidney failurediabeteseye diseaseerectile dysfunction and other conditions.

Very occasionally, people with very high blood pressure are at serious risk of problems and need urgent treatment in hospital to reduce the risk of a stroke or heart attack.

Current Australian guidelines recommend that if you have persistent raised blood pressure over 160/100, you should talk to your doctor or specialist about taking medication to lower your blood pressure.


What causes high blood pressure?

For most people, the cause of high blood pressure is not known. However, it is clear that various conditions and behaviour make high blood pressure more likely. These are known as risk factors, and include:

  • leading a sedentary lifestyle (with little or no exercise)
  • smoking
  • being overweight
  • a diet with a high salt intake
  • high blood cholesterol
  • a family history of high blood pressure
  • high alcohol consumption
  • diabetes
  • high salt intake

In a few people, there is an identifiable cause, such as narrowing of the arteries of the kidney (renal stenosis) or some hormonal conditions.

What are the symptoms of high blood pressure?

Most people with high blood pressure have no symptoms, and may feel quite well. This is why it’s important to see your doctor and have your blood pressure checked regularly, especially if you have one or more of the risk factors listed above.

A few people with very high blood pressure may experience headachedizziness or the sudden effects of diseases of the arteries such as chest pain or stroke.

Diagnosing high blood pressure

Your blood pressure varies from day to day, even from moment to moment. Generally, if a person has a blood pressure reading taken on 3 separate occasions that is greater than 140/90, they have high blood pressure. Your doctor may ask you to monitor your blood pressure at home, or wear a monitor over a 24-hour period, to see how it varies and to make sure they get an accurate reading.

What is the treatment for high blood pressure?

Mild high blood pressure can often be treated by making lifestyle changes, including:

  • doing regular physical activity
  • stopping smoking
  • improving your diet to reduce salt, reduce fat and eat plenty of fruit and vegetables
  • losing weight
  • limiting your alcohol intake to no more than 2 drinks per day for men, or 1 drink per day for women with high blood pressure

Lifestyle changes may, however, not be enough. Some people also need medication to help reduce blood pressure levels to normal. While medicines are usually very effective at lowering blood pressure, they may cause side effects in some people.

Usually doctors will start a person on a low dose of a medicine and see how it goes. If it doesn’t work well enough, or if there are troublesome side effects, other medicines will be used, sometimes in combination, until the blood pressure is controlled. This can take time. Some people will take medicines for life, although others will find that continuing to lose weight and change their diet reduces the need for medicines.

Someone whose blood pressure is very high or causing symptoms such as headache, or if they have conditions such as heart disease or diabetes, may need urgent treatment with medicines to bring the blood pressure down to normal levels.

Preventing high blood pressure

If you can follow a healthy diet, keep to a healthy weight and avoid smoking, you will reduce your chances of having high blood pressure.

More information

There are a number of resources and services available if you need help or more information on high blood pressure:


Heart Foundation (Hypertension guideline)The Royal Australian College of General Practitioners(Guidelines for preventive activities in general practice (Blood pressure))Choosing Wisely Australia (Recommendations)Heart Foundation (Blood pressure)Baker Heart & Diabetes Institute (Blood pressure and your health)Diabetes Australia (Blood pressure)High Blood Pressure Research Council of Australia (What is High Blood Pressure?)myDr (High blood pressure should be treated)

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