What is blood pressure?
Blood pressure is the strength of your blood pushing against the sides of your blood vessels. There are two components to your blood pressure reading.
- Systolic blood pressure (the top number) — indicates how much pressure your blood is exerting against your artery walls during heartbeats.
- Diastolic blood pressure (the bottom number) — indicates how much pressure your blood is exerting against your artery walls while the heart is resting between beats.
Below is a chart from The American Heart Association explaining healthy and unhealthy blood pressure ranges.