A blood pressure of 108/63 is a good reading. It falls within the normal range of 90/60 to 120/80 mmHg, putting you comfortably below the thresholds where heart disease and stroke risk start to climb. For most people, this number is nothing to worry about.
Where 108/63 Falls on the Scale
Blood pressure categories are defined by two numbers: systolic (the top number, measured when your heart beats) and diastolic (the bottom number, measured between beats). Here’s how the current guidelines break them down:
- Normal: below 120/80 mmHg
- Elevated: 120–129 systolic with diastolic still under 80
- Stage 1 hypertension: 130–139 systolic or 80–89 diastolic
- Stage 2 hypertension: 140/90 mmHg or higher
- Low blood pressure (hypotension): below 90/60 mmHg
Your reading of 108/63 sits solidly in the normal category. The most recent AHA/ACC guidelines encourage most adults to keep their blood pressure below 120/80, and even push toward getting it as low as possible within the normal range. At 108/63, you’re there. Current guidelines apply the same targets regardless of age, so this reading is considered healthy whether you’re 25 or 70.
Why the Diastolic Number Looks Low
A diastolic reading of 63 is perfectly normal, but it’s close enough to the 60 mmHg cutoff that it might catch your eye. Clinically, hypotension isn’t diagnosed until diastolic pressure drops below 60 or systolic drops below 90. At 63, you have a comfortable margin.
Diastolic pressure naturally varies throughout the day. It can dip lower when you’re resting, sleeping, or well hydrated, and rise slightly during physical or emotional stress. A single reading of 63 in the context of a healthy systolic number like 108 is not a red flag. If your diastolic number consistently lands in the low 50s or below, that’s when it becomes worth investigating.
People Who Tend to Run Lower
Some people naturally have blood pressure on the lower end of normal, and 108/63 is a common resting reading for a few groups in particular. Endurance athletes often have lower blood pressure because regular aerobic training increases blood volume by as much as 35% and makes the heart more efficient at pumping. A well-conditioned heart moves more blood with each beat, so it doesn’t need to generate as much pressure.
Pregnant women also experience lower blood pressure, especially in the first and second trimesters. During pregnancy, blood vessels relax and resistance drops by 25 to 30 percent, which can push readings lower than usual. Blood pressure typically returns to pre-pregnancy levels in the third trimester as vascular resistance climbs back up.
Younger women, people who are naturally slim, and those on certain medications (particularly for high blood pressure or heart conditions) may also see readings in this range routinely.
When a Low-Normal Reading Becomes a Problem
Blood pressure of 108/63 only becomes a concern if it’s paired with symptoms. The number itself isn’t the issue. What matters is whether your body is getting enough blood flow to your brain and organs. Symptoms that signal a problem include:
- Dizziness or lightheadedness, especially when standing up
- Fainting or near-fainting episodes
- Persistent fatigue that isn’t explained by sleep or activity levels
- Trouble concentrating or feeling mentally foggy
- Blurred vision
- Nausea
One specific pattern to watch for is called orthostatic hypotension, which happens when your blood pressure drops sharply as you stand. It’s defined as a systolic drop of at least 20 mmHg or a diastolic drop of at least 10 mmHg within three minutes of standing up. If you regularly feel dizzy or unsteady when getting out of bed or rising from a chair, that’s worth mentioning to a doctor, even if your seated blood pressure looks fine. People without symptoms generally don’t need any treatment.
How to Get the Most Accurate Reading
A single blood pressure reading is a snapshot, not a verdict. Your numbers fluctuate based on time of day, caffeine intake, stress, hydration, and even how you’re sitting. For the most reliable picture, take readings at the same time each day, ideally in the morning before eating or exercising. Sit with your back supported, feet flat on the floor, and your arm resting at heart level. Don’t talk during the measurement.
Taking two or three readings a minute apart and averaging them gives you a much more accurate number than relying on a single check. If your readings consistently fall between 90/60 and 120/80 and you feel fine, your blood pressure is doing exactly what it should. A reading of 108/63 is, by every current guideline, a healthy place to be.