OverviewWhat do your blood pressure numbers mean?Blood pressure is a measure of the force of blood against the walls of your arteries. Blood pressure readings include two numbers. The first number is the systolic pressure (top number). This is the force of blood on the artery walls as your heart pumps. The second number is the diastolic pressure (bottom number). This is the force of blood on the artery walls between heartbeats. Show
If the top number stays high, or the bottom number stays high, or both, that means you have high blood pressure (hypertension). It's normal for blood pressure to go up and down throughout the day. Your doctor will give you a goal for your blood pressure. What can cause blood pressure to go up or down?It's normal for blood pressure to go up and down throughout the day. Things like exercise, stress, and sleeping can affect your blood pressure. Some medicines can cause your blood pressure to go up. These medicines include certain asthma medicines and cold remedies. A low blood pressure reading can be caused by many things, including some medicines, a severe allergic reaction, or an infection. Another cause is dehydration, which is when your body loses too much fluid. When should you call your doctor?One high or low blood pressure reading by itself may not mean you need to call for help. If you take your blood pressure and it is out of the normal range, wait a few minutes and take it again. If it's still high or low, use the following guidance. Call 911 anytime you think you may need emergency care. For example, call if:
Call your doctor now or seek immediate medical care if:
Watch closely for changes in your health, and be sure to contact your doctor if:
CreditsCurrent as of: March 9, 2022 Author: Healthwise Staff Find out how to understand blood pressure readings and use our blood pressure chart to see how healthy your blood pressure is.What does a blood pressure reading look like?When you have your blood pressure measured, you will be given two numbers, a top number and a bottom number.
Blood pressure is measured in millimetres of mercury (mmHg). If the first number is 120 and the second number is 80, this would be written as 120/80mmHg, and you’d call it ‘120 over 80’. This video explains more about systolic and diastolic blood pressure. The blood pressure chartOnce you know your numbers, you can use the blood pressure chart to see what they mean and if your blood pressure is in the healthy range. The chart is suitable for adults of any age, as the cut-off point for diagnosing high blood pressure doesn’t change with age.  How to use the blood pressure chart Simply find your top number (systolic) on the left side of the chart and your bottom number (diastolic) on the bottom. Where the two lines meet is your blood pressure. Download the chart. Blood pressure chart for adults - PDF [PDF 121KB] What do the readings mean?As a general guide: • 140/90mmHg or over – you may have high blood pressure • 120/80mmHg up to 140/90mmHg – pre-high blood pressure • 90/60mmHg up to 120/80mmHg – ideal blood pressure • 90/60mmHg or lower – you may have low blood pressure The video below explains how your blood pressure numbers are linked to the risk of stroke and other disease.
Diagnosing high or low blood pressureOnly one of your numbers needs to be higher than it should be to be diagnosed with high blood pressure, and only one needs to be lower than it should be to be diagnosed with low blood pressure. So if your top number is over 140 or the bottom number is over 90, you may be diagnosed with high blood pressure, regardless of the other number. If your top number is under 90 or your bottom number is under 60, you may be diagnosed with low blood pressure. Use the chart to see where your numbers sit. If your top number (systolic pressure) is consistently higher than 140mmHg, but the bottom number is healthy - this is known as Isolated Systolic Hypertension. If the bottom number (diastolic pressure) is consistently higher than 90mmHg but the top number is healthy - this is known as Isolated Diastolic Hypertension. Making sure your readings aren’t a one-off A single high reading doesn’t necessarily mean you have high blood pressure, as many things can affect your blood pressure throughout the day, such as the temperature, when you last ate, and if you’re feeling stressed. Your doctor or nurse will probably want to measure your blood pressure a number of times over a few weeks to make sure the reading wasn’t just a one off and that your blood pressure stays high over time. Read about how high blood pressure is diagnosed, getting a blood pressure check, the further tests you might have if you have a high blood pressure reading, and what it means if you’re diagnosed with high blood pressure. Which is more important systolic or diastolic blood pressure?Over the years, research has found that both numbers are equally important in monitoring heart health. However, most studies show a greater risk of stroke and heart disease related to higher systolic pressures compared with elevated diastolic pressures.
When should you worry about the bottom number of blood pressure?Over time, isolated diastolic hypotension can cause heart failure. In fact, it may be one of the most common causes of heart failure. Pay attention to your diastolic number when you have your blood pressure checked. If your lower number is 60 or below, ask a healthcare professional about it.
What causes the bottom number to be high on blood pressure?Diastolic pressure is the bottom number of a blood pressure reading. IDH occurs if someone has elevated diastolic blood pressure, increasing a person's risk of heart disease and stroke. Smoking, consuming alcohol, obesity, and high blood fat may lead to IDH.
What is ideal blood pressure by age?Normal Blood Pressure By Age Both Male and Female. |
What do top and bottom bp numbers mean
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