A blood pressure of 108/59 falls within the normal range. The 2025 guidelines from the American Heart Association and American College of Cardiology define normal blood pressure as below 120/80 mmHg, and both your numbers clear that threshold. For most people, this is a healthy reading that reflects good cardiovascular function.
That said, the diastolic number (59) sits on the lower end of what’s typical, which raises a few nuances worth understanding.
What 108/59 Means by the Numbers
Blood pressure is measured in two parts. The top number (systolic) reflects the pressure in your arteries when your heart beats. The bottom number (diastolic) reflects the pressure between beats, when your heart is resting. At 108/59, your systolic pressure is comfortably normal, and your diastolic pressure is below 60, which is lower than average but not automatically a problem.
There’s no single cutoff where low blood pressure becomes “too low.” Most healthcare professionals consider blood pressure problematic only when it causes symptoms. If you feel fine at 108/59, this reading is simply your baseline, and it’s a good one from a heart-health perspective.
Why the Diastolic Number Matters
Research published in the journal Hypertension has identified what’s called a J-curve relationship between diastolic blood pressure and cardiovascular risk. The lowest risk for heart disease sits in the 70 to 90 mmHg diastolic range. Below 70, the association with cardiovascular events starts to tick upward, particularly for coronary heart disease. At 59, your diastolic reading falls into this lower zone.
This doesn’t mean 59 is dangerous. The J-curve data comes largely from older adults and people already being treated for high blood pressure. In younger, healthy people and athletes, a diastolic reading in the upper 50s is common and reflects strong cardiovascular fitness. Context matters enormously here. A fit 30-year-old with a diastolic of 59 and no symptoms is in a completely different situation than a 70-year-old on blood pressure medication with the same reading.
When 108/59 Could Be a Concern
The key question isn’t the number itself, it’s how you feel. Low blood pressure becomes a medical issue when your body isn’t getting enough blood flow to your brain and organs. Symptoms to watch for include:
- Dizziness or lightheadedness, especially when standing up
- Blurred or fading vision
- Fatigue that doesn’t improve with rest
- Trouble concentrating
- Fainting or near-fainting episodes
- Nausea
A sudden drop in blood pressure is more concerning than a consistently low reading. A change of just 20 mmHg can cause dizziness or fainting, so if 108/59 represents a significant drop from your usual numbers, that’s worth paying attention to. Dehydration, illness, and overtreatment with blood pressure medication are common causes of sudden drops.
Who Typically Runs This Low
Endurance athletes, younger women, and people who are naturally slim often have blood pressure readings in this range. Regular cardiovascular exercise strengthens the heart so it pumps more efficiently with less force, which lowers both numbers. During pregnancy, blood pressure commonly dips during the first and second trimesters before rising again closer to delivery. A reading of 108/59 during pregnancy is normal, though your provider will monitor it at every prenatal visit.
Older adults are the group where this reading deserves the most attention. Aging makes blood vessels stiffer, and the heart relies more on adequate diastolic pressure to supply its own muscle with blood. A diastolic reading in the upper 50s in someone over 65 warrants a conversation with their provider, particularly if they’re taking blood pressure medication that may be driving it lower than necessary.
Simple Ways to Support Healthy Blood Pressure
If you’re symptom-free at 108/59, you don’t need to do anything differently. But if you occasionally feel lightheaded or fatigued, a few practical adjustments can help.
Staying well hydrated is the simplest intervention. Fluids increase blood volume, which directly supports blood pressure. Eating smaller, more frequent meals can also help, since blood pressure sometimes dips after large, carb-heavy meals as blood flow shifts to your digestive system. Limiting large servings of potatoes, rice, pasta, and bread in a single sitting can reduce this effect.
For people with genuinely low blood pressure, slightly increasing salt intake can help, though this is a case where more isn’t always better, especially for older adults or anyone with heart concerns. A morning cup of coffee or tea also provides a mild, temporary boost. Compression stockings can improve blood flow from the legs back to the heart, which is particularly helpful if you notice symptoms after standing for long periods.
If your blood pressure regularly reads below 90/60 or you’re experiencing any of the symptoms listed above, that’s the point where evaluation becomes important to rule out an underlying cause like a thyroid issue, adrenal problem, or medication side effect.