Blood pressure is usually written as two numbers, for example 120/80 mmHg. Many people wonder what these two numbers mean and why there are two of them rather than one. Understanding their meaning can help you read your blood pressure results more confidently.
What the Systolic and Diastolic Numbers Mean
The first number, the larger one, is called the systolic pressure. It reflects the pressure inside your blood vessels when the heart contracts, or pumps blood out to the rest of the body. The second number, the smaller one, is called the diastolic pressure, which is the pressure while the heart rests briefly between two beats. The unit used is mmHg, or millimeters of mercury.
These two numbers are read together. That is why blood pressure is always stated as two numbers, for example one hundred twenty over eighty, and not just a single number.
Why Blood Pressure Can Fluctuate
Blood pressure is not a fixed number throughout the day. It can rise and fall depending on many things, such as physical activity, body position, anxiety or stress, lack of sleep, caffeine intake, and your condition at the time of measurement. For this reason, a single measurement does not necessarily describe your overall condition.
To make the result more representative of your true state, the measurement is usually taken while the body is calm and is sometimes repeated. The value considered ideal can also differ depending on each person's condition, so it is best assessed by a doctor.
What You Can Do
- Rest for a moment before your blood pressure is measured.
- Avoid caffeine or strenuous activity right before the measurement.
- If possible, keep a record of your readings over time.
- Tell your doctor if you feel any symptoms.
This article is intended to help you understand what blood pressure numbers mean, not as a diagnosis or a substitute for a medical examination. If you have concerns about your blood pressure, it is best to consult a doctor, including a 20FIT doctor, so you can receive an assessment suited to your condition.