A blood pressure of 104/59 mmHg falls within the normal range and is generally a healthy reading. Normal blood pressure is defined as a systolic (top number) below 120 and a diastolic (bottom number) below 80. Your reading clears both thresholds comfortably, placing you well below the “elevated” category, which starts at 120/80.
That said, the diastolic number of 59 sits close to the lower end of what’s typical, and whether this reading is ideal for you depends on how you feel and a few personal factors worth understanding.
Where 104/59 Falls on the Scale
Blood pressure categories work like a ladder. Normal is below 120/80. Elevated is 120 to 129 systolic with a diastolic still under 80. The stages of high blood pressure climb from there. On the low end, clinical hypotension is defined as a reading below 90/60. At 104/59, your systolic number is solidly above 90, but your diastolic of 59 dips just under the 60 mark. This alone doesn’t mean you have low blood pressure, because the diagnosis requires both numbers to be below those cutoffs, or for symptoms to be present.
For most adults, a reading like this is perfectly fine and actually associated with lower cardiovascular risk over time. The American Heart Association’s recommendation for people with normal blood pressure is simply to maintain a healthy lifestyle.
Who Tends to Run on the Lower Side
Some people naturally have blood pressure in this range their entire lives. Younger adults, particularly women, often have systolic readings in the low 100s. People who are physically active or have a smaller body frame tend to run lower as well. Athletes frequently have resting blood pressures well below the population average because regular exercise makes the heart more efficient at pumping blood.
During pregnancy, blood pressure also tends to drop, especially in the first and second trimesters, before returning closer to baseline later on. A reading of 104/59 during pregnancy is still considered normal, since concern typically begins at 140/90 or higher after 20 weeks.
If your blood pressure has always hovered in this range and you feel fine, there’s no reason to worry about it.
When a Low-Normal Reading Deserves Attention
The real question with any blood pressure reading isn’t just the numbers. It’s whether those numbers are causing problems. A reading of 104/59 only becomes concerning if it’s accompanied by symptoms like dizziness, lightheadedness, blurred vision, nausea, fatigue, or difficulty concentrating. Fainting is the most obvious red flag. If you’re experiencing any of these regularly, the reading may be too low for your body, even though it technically falls in the “normal” category.
Pay particular attention to how you feel when standing up quickly. Orthostatic hypotension is a sudden blood pressure drop that occurs when you move from sitting or lying down to standing. It’s diagnosed when the top number drops by 20 mmHg or more, or the bottom number drops by 10 mmHg or more, within two to five minutes of standing. If you already sit at 104/59, even a modest positional drop could push you into territory where you feel unsteady.
What Can Push Blood Pressure Lower Temporarily
If 104/59 is lower than your usual reading, a few common factors could explain it. Dehydration is one of the most frequent causes. When your body doesn’t have enough water, total blood volume decreases and pressure drops. This can happen after strenuous exercise, a bout of vomiting or diarrhea, a day of not drinking enough fluids, or spending extended time in the heat.
Hot environments on their own can lower blood pressure. Spending too long in the sun, a hot tub, or a sauna causes blood vessels to widen, which reduces pressure. Standing for long periods can have a similar effect, especially in younger adults and teenagers, because gravity pulls blood toward the legs and temporarily reduces the amount returning to the heart.
Certain medications can also bring blood pressure down. Diuretics (water pills), drugs prescribed for high blood pressure, some antidepressants, and medications for prostate conditions are common culprits. If you recently started or adjusted a medication and noticed lower readings, that connection is worth mentioning to your provider.
What You Can Do About It
If you feel perfectly healthy at 104/59, the answer is simple: nothing needs to change. Keep doing what you’re doing.
If you’re noticing occasional lightheadedness or fatigue, a few practical adjustments can help. Drink more water throughout the day, especially before and after exercise or time in the heat. When getting out of bed or standing up from a chair, do it slowly rather than jumping to your feet. Adding a bit more salt to your diet can raise blood pressure slightly, though this is only appropriate if your numbers genuinely run low and not if you have other cardiovascular risk factors.
Eating smaller, more frequent meals can also help. Large meals divert blood flow to the digestive system, which can cause a temporary dip in pressure. Crossing your legs while sitting or tensing your thigh muscles before standing are small tricks that help maintain blood flow to the brain during position changes.
If symptoms like dizziness, fainting, or persistent fatigue are part of your daily life, that pattern warrants a conversation with a healthcare provider. They can check whether an underlying condition or medication is responsible and whether your “normal” reading is actually too low for you as an individual.