Understanding Your Blood Pressure Numbers
If you’ve ever stared at a reading like “128/82” and nodded politely without knowing what it meant, you’re in good company. Blood pressure is one of the most commonly measured health numbers — and one of the least understood.
What the two numbers mean
The top number (systolic) is the pressure in your arteries when your heart beats. The bottom number (diastolic) is the pressure between beats, while the heart rests. Both are measured in millimeters of mercury (mmHg).
The general ranges
- Normal: below 120/80
- Elevated: 120–129 systolic and below 80 diastolic
- High (Stage 1): 130–139 or 80–89
- High (Stage 2): 140+ or 90+
A single high reading doesn’t mean you have hypertension. Blood pressure moves throughout the day and rises with stress, caffeine, and even the “white coat effect” of being in a clinic. Diagnosis is based on a pattern of readings over time.
Getting an accurate home reading
Sit quietly for five minutes first. Keep both feet flat on the floor, back supported, and the cuff at heart level. Don’t talk during the measurement, and skip caffeine or exercise for 30 minutes beforehand. Take two readings a minute apart and record both.
Why it matters
High blood pressure usually has no symptoms, which is exactly why regular checks matter. Over years, it quietly strains the heart, blood vessels, kidneys, and brain. The good news: it responds well to changes like reducing sodium, moving more, limiting alcohol, and managing stress — and to treatment plans your doctor can tailor to you.
Bring your home readings to your next appointment. A simple log turns a vague conversation into a productive one.