A blood pressure of 107/66 is a good reading. It falls squarely within the “normal” category, which the American Heart Association defines as below 120/80 mm Hg. Both your top number (systolic) and bottom number (diastolic) are well within healthy range, and this reading puts you comfortably below the thresholds where cardiovascular risk begins to climb.
What 107/66 Means
The top number, 107, measures the pressure in your arteries when your heart beats and pushes blood out. The bottom number, 66, measures the pressure between beats, when your heart is resting. Both numbers matter, and both of yours are in a healthy zone.
Current guidelines from the American Heart Association and American College of Cardiology break blood pressure into four categories:
- Normal: below 120 systolic and below 80 diastolic
- Elevated: 120 to 129 systolic and below 80 diastolic
- Stage 1 hypertension: 130 to 139 systolic or 80 to 89 diastolic
- Stage 2 hypertension: 140 or higher systolic, or 90 or higher diastolic
At 107/66, you’re not just normal. You’re well below the 120/80 ceiling, with a comfortable margin before reaching “elevated” territory. These categories apply the same way regardless of age. The guidelines don’t use different cutoffs for younger versus older adults.
Why This Reading Is Favorable
Blood pressure in the low-normal range is associated with lower cardiovascular risk over time. Your arteries aren’t under excessive force, which means less wear on blood vessel walls, less strain on the heart, and a lower likelihood of the gradual damage that leads to heart disease and stroke. A reading like 107/66 is common among people who exercise regularly, since consistent physical activity lowers resting blood pressure throughout the day.
If you’re pregnant, this reading also falls within the normal range. Normal blood pressure during pregnancy is considered 120/80 or lower.
When a Low Reading Becomes a Problem
There’s no strict number that defines “too low” in the way that 130/80 defines hypertension. Instead, low blood pressure is generally a concern only when it causes symptoms. If you feel fine at 107/66, this is simply your healthy baseline.
Symptoms that would signal a problem include dizziness or lightheadedness, blurred or fading vision, fainting, persistent fatigue, trouble concentrating, or nausea. These are more likely to occur with a sudden drop in blood pressure than with a consistently low reading. A decline of even 20 mm Hg from your usual level can be enough to cause dizziness or fainting, even if the resulting number looks “normal” on paper. So the trend matters as much as the single reading.
If your blood pressure has always hovered around this range and you have no symptoms, there’s nothing to address. If it recently dropped from a higher baseline, or if you’re experiencing any of the symptoms above, that’s worth investigating since it can occasionally point to an underlying issue like dehydration, medication side effects, or a hormonal imbalance.
Getting an Accurate Picture
A single blood pressure reading is a snapshot, not a diagnosis. Blood pressure fluctuates throughout the day based on activity, stress, caffeine, hydration, and even body position. If you took this reading at home, it’s worth checking a few more times on different days and at different times to confirm the pattern. Sit quietly for five minutes before measuring, keep your feet flat on the floor, and use a cuff on your upper arm rather than your wrist for the most reliable result.
If your readings consistently cluster around 107/66, you’re in an excellent position. That’s a number most people would be happy to see, and it suggests your heart and blood vessels are working efficiently without unnecessary strain.