How to Read Blood Pressure Numbers
Understanding what systolic, diastolic, and the numbers in between really mean for your health.
mmHg (millimeters of mercury)
Systolic (Top Number)
Pressure when your heart beats and pushes blood out. Higher = heart working harder.
Diastolic (Bottom Number)
Pressure when your heart rests between beats. Shows resistance in your arteries.
Blood Pressure Categories
How Our AI Agent Reads Your BP Trends
A single reading doesn't tell the full story. Our AI looks for patterns:
- Trend direction: Is your BP gradually increasing, stable, or improving over weeks?
- Time-of-day patterns: Morning readings often higher - we track this.
- Variability: Large swings between readings may indicate stress or measurement issues.
Tips for Accurate Readings
Sit quietly for 5 minutes first
Rest before measuring - don't take readings right after walking in.
Use proper arm position
Arm supported at heart level, feet flat on floor, back supported.
Take 2-3 readings
Measure twice, 1 minute apart, and average them for accuracy.
Measure at the same time daily
Consistency helps identify true trends vs. normal daily variation.
Empty bladder first
A full bladder can add 10-15 points to your reading.
Frequently Asked Questions
What do blood pressure numbers mean?
Blood pressure is measured as two numbers: systolic (top number) is pressure when your heart beats, diastolic (bottom number) is pressure between beats. Both are measured in mmHg (millimeters of mercury).
What is normal blood pressure?
Normal blood pressure is less than 120/80 mmHg. Elevated is 120-129/<80. High blood pressure Stage 1 is 130-139/80-89. Stage 2 is 140+/90+. Crisis is above 180/120.
Which number is more important?
Both matter. For people over 50, systolic (top) is often more predictive of heart disease risk. In younger people, diastolic may be equally important. Consistently high readings in either are concerning.
Why does blood pressure change throughout the day?
BP is lowest during sleep and rises in the morning. Stress, caffeine, exercise, meals, and even talking can cause temporary increases. This is why tracking patterns over time is important.