A blood pressure of 109/75 is a good reading. Both numbers fall within the normal range, and this combination sits in a sweet spot associated with low cardiovascular risk. You’re well below the threshold for elevated blood pressure and comfortably above the cutoff for low blood pressure.
Where 109/75 Falls in Official Categories
The 2025 guidelines from the American Heart Association and American College of Cardiology define normal blood pressure as below 120/80 mmHg. At 109/75, both your systolic (top number) and diastolic (bottom number) clear that bar. The next category up, “elevated,” doesn’t start until systolic hits 120, and stage 1 hypertension begins at 130/80. You’re nowhere near either threshold.
On the other end, blood pressure is generally considered low (hypotensive) when it drops below 90/60 mmHg. Your reading of 109/75 is well above that floor, so there’s no concern about it being too low from a clinical standpoint.
The 2024 European Society of Cardiology guidelines use slightly different language but reach the same conclusion. They define “non-elevated” blood pressure as systolic below 120 and diastolic below 70. Your diastolic of 75 actually sits just above that European cutoff, but still within a perfectly healthy range by any standard.
What the Numbers Mean for Long-Term Health
A systolic reading in the 100 to 109 range carries very low cardiovascular risk. A large study of healthy adults found that cardiovascular disease rates increased in a staircase pattern as systolic pressure climbed: 1.45 events per 1,000 person-years for those in the 90 to 99 range, 2.15 for those in the 100 to 109 range, 3.06 for 110 to 119, and 3.80 for 120 to 129. After adjusting for other risk factors, none of these groups showed a statistically significant increase in cardiovascular risk compared to the lowest group. In other words, any systolic pressure between 90 and 129 was safe in otherwise healthy people, and being at 109 puts you toward the lower, more favorable end of that spectrum.
Your diastolic reading of 75 is also in an ideal zone. Research from the Women’s Health Initiative found that the diastolic pressure associated with the lowest mortality risk was around 72 mmHg, with the safest range spanning roughly 68 to 77 mmHg. A diastolic of 75 lands right in that window.
When a Reading Like This Could Be Too Low
For most adults, 109/75 is nothing to worry about. But context matters. In older adults, particularly those over 80, blood pressure that looks “ideal” on paper can sometimes be too aggressive. The risk of reduced blood flow to the brain and other organs increases with age, and studies have shown that in very elderly patients, systolic pressure at or below 120 can actually be associated with higher mortality. Guidelines for adults over 80 generally recommend a systolic target of 140 to 150, meaning a reading of 109 could potentially signal over-treatment if you’re on blood pressure medication.
Age-related arterial stiffening also changes the relationship between the two numbers. From midlife onward, diastolic pressure tends to drop naturally while systolic tends to rise. A low diastolic in an older adult may reflect stiff arteries rather than good cardiovascular health. For a younger or middle-aged adult, though, 75 diastolic is simply a healthy number.
Symptoms to Watch For
Most people with a systolic reading around 109 feel perfectly fine. Low blood pressure only becomes a problem when it causes symptoms. If you experience dizziness or lightheadedness (especially when standing up), persistent fatigue, blurry vision, nausea, or fainting, those could signal that your blood pressure is dropping too low at certain points during the day. A single reading of 109/75 wouldn’t typically cause these symptoms, but blood pressure fluctuates throughout the day, and it may dip lower at other times.
If you feel well, your reading is simply a sign of good cardiovascular health. No action needed.
During Pregnancy
If you’re pregnant and wondering whether 109/75 is safe, the answer is yes. Normal blood pressure in pregnancy is defined the same way: below 120/80. Gestational hypertension isn’t diagnosed unless systolic reaches 140 or diastolic reaches 90 after 20 weeks of pregnancy. A reading of 109/75 is far from those thresholds. Blood pressure often dips during the first and second trimesters before rising again in the third, so a reading in this range during early pregnancy is especially common and expected.
Getting an Accurate Reading
A single blood pressure reading is a snapshot, not a diagnosis. Your numbers shift based on stress, caffeine, physical activity, hydration, and even the time of day. To get the most reliable picture, measure at the same time each day, sit quietly for five minutes beforehand, keep your feet flat on the floor, and place your arm at heart level. Taking two or three readings a minute apart and averaging them gives a more stable result than relying on any single measurement.
If 109/75 is your typical reading across multiple measurements, you’re in excellent shape. It reflects a cardiovascular system that isn’t working harder than it needs to, with both numbers sitting in the ranges associated with the lowest long-term risk.