A blood pressure of 108/65 mmHg falls comfortably within the range most medical guidelines consider healthy. Standard thresholds define normal blood pressure as a systolic reading under 120 and a diastolic under 80, so both of your numbers sit well below the ceiling for concern about hypertension. Whether this reading is “too low” depends almost entirely on how you feel, not on the numbers alone.
Symptoms Are What Separate Healthy From Too Low
There is no universally agreed-upon number where blood pressure becomes “too low.” Unlike hypertension, which has firm cutoffs, hypotension is more of a clinical judgment call. Most practitioners only start worrying when readings drop below about 90/60 and the person is experiencing symptoms like dizziness, fainting, blurred vision, or fatigue. At 108/65, you are nowhere near that threshold.
If you feel fine at 108/65, your body is getting adequate blood flow to your brain and organs, and the reading is simply your normal baseline. Many people live their entire lives with systolic pressures in the low 100s or even the 90s and never have a single problem. The reading only becomes medically relevant if you are symptomatic, if it represents a sudden drop from your usual numbers, or if it shows up alongside other concerning findings.
The Diastolic Number and Why 65 Is Worth Understanding
Most people focus on the top number, but the bottom number carries its own clinical weight. Diastolic pressure reflects the force in your arteries between heartbeats, and it plays a critical role in coronary blood flow because the heart muscle receives most of its blood supply during that resting phase between beats. If diastolic pressure drops too low, the heart can theoretically be underperfused.
Research has identified what is sometimes called a “J-curve” for diastolic pressure, meaning risk does not just go down as the number falls. At some point, extremely low diastolic readings are associated with worse outcomes, particularly in people who already have heart disease. One large study of adults whose systolic pressures were treated to below 130 found evidence that very low diastolic values could result in underperfusion and associated cardiac damage, with cardiac biomarkers rising as diastolic pressure fell too far.1JAMA Network Open. Evaluation of Optimal Diastolic Blood Pressure Range Among Adults With Treated Systolic Blood Pressure Less Than 130 mm Hg But a diastolic of 65 is not in that danger zone. Most studies looking at this J-curve find the risk inflection point at diastolic values well below 60, and mainly in people with pre-existing coronary artery disease or heart failure. For a generally healthy person, 65 is unremarkable.
That said, if your diastolic is consistently in the low 60s or below and you are an older adult or have known heart disease, it is worth mentioning to your doctor. The concern is not the snapshot number but the pattern over time and the clinical context it sits in.
Why Your Reading Changes From Hour to Hour
A single blood pressure reading is a snapshot, not a portrait. Your blood pressure shifts constantly throughout the day in response to activity, stress, hydration, posture, and even the time since your last meal. Research tracking blood pressure moment to moment has shown that even in people with normal overall numbers, systolic pressure can swing by several mmHg within seconds.2PubMed. Daily life blood pressure changes are steeper in hypertensive than in normotensive subjects A reading of 108/65 taken at rest in the morning might look like 118/72 after climbing stairs and 100/62 during a relaxed afternoon nap.
This variability is why a single reading at the pharmacy or doctor’s office does not define your blood pressure. If you are curious about your baseline, taking readings at different times of day over a week gives a much more reliable picture. Home monitors are accurate enough for this purpose as long as you follow basic technique: sit quietly for five minutes first, keep your arm at heart level, and avoid caffeine or exercise right before measuring.
Blood pressure also follows a predictable daily cycle. It typically drops by about 10 to 20 percent during sleep compared to waking values, a pattern known as nocturnal dipping.3MDPI (International Journal of Environmental Research and Public Health). The Night Side of Blood Pressure: Nocturnal Blood Pressure Dipping and Emotional (dys)Regulation People whose blood pressure does not dip at night, or who experience a reverse pattern where it rises during sleep, actually face higher cardiovascular risk than those whose pressure drops normally. So if your 108/65 is a daytime reading, your sleeping pressure is likely even lower, and that is perfectly fine.
Low Blood Pressure in Older Adults Is a Different Story
The reassuring picture of 108/65 applies most clearly to younger and middle-aged adults. In older adults, lower blood pressure readings carry a more complicated set of trade-offs, especially on the diastolic side.
One concern is fall risk. A study of community-dwelling older adults found that those with diastolic blood pressure at or below 60 mmHg had a roughly 25 percent higher risk of fall injuries compared to those with higher diastolic values.4PubMed Central. Low blood pressure levels for fall injuries in older adults: the Health, Aging and Body Composition Study The mechanism is straightforward: lower baseline pressure means less buffer when standing up quickly, making momentary drops in brain blood flow more likely. At 65 diastolic you are above that threshold, but only modestly so if you are over 70.
A more sobering concern is cognitive health. Research has shown that chronically low blood pressure in older adults is associated with increased long-term risk of dementia and all-cause mortality, even at levels that do not produce obvious acute symptoms like dizziness or fainting. One review found that adults over 60 with a diastolic below 80 were significantly more likely to show mild to moderate cognitive impairment.5OBM Geriatrics. Redefining Hypotension in Older Adults: Implications for the Prevention of Age Related Cognitive Decline The concern is that blood pressure low enough to reduce chronic perfusion to the brain may accelerate age-related decline over years, even when acute symptoms are absent.
This does not mean 108/65 is dangerous for a 70-year-old. It means the same reading warrants different scrutiny at different ages. A doctor working with an older patient will weigh that reading against the person’s cognitive function, fall history, and medication list in a way that would not be necessary for a 35-year-old.
Fitness and Naturally Low Readings
If you exercise regularly, particularly endurance activities like running, cycling, or swimming, a resting blood pressure of 108/65 is not only normal but expected. Chronic exercise training tends to lower resting blood pressure through several mechanisms: improved arterial flexibility, greater stroke volume so the heart does not need to pump as forcefully, and better autonomic regulation.
Research comparing endurance-trained, resistance-trained, and sedentary individuals has found meaningful differences in how the cardiovascular system responds to postural changes. Endurance-trained individuals tend to have lower resting pressures and can experience slightly larger drops in systolic pressure when they stand up quickly, on the order of 8 mmHg in one study.6PubMed Central. Impact of chronic exercise training on the blood pressure response to orthostatic stimulation Resistance-trained individuals, interestingly, showed the opposite pattern, with their mean arterial pressure actually rising when they stood. The differences were linked to changes in heart wall thickness and arterial stiffness that come with different types of training.
For most fit people, these postural shifts are handled smoothly by the body’s reflexes and cause no symptoms. If you are very fit and occasionally feel a head rush when standing up quickly after sitting for a long time, it is a common experience and usually not dangerous. Standing more slowly, flexing your leg muscles before getting up, and staying well hydrated are simple fixes.
When Medications Push Blood Pressure Too Low
If you take blood pressure medication and your readings are consistently around 108/65, it is worth checking whether your medications are overshooting the target. Treatment aims to reduce cardiovascular risk, but pushing blood pressure too far below the goal can create its own problems.
A large study of adults being treated for hypertension found that those whose blood pressure was lowered to the lowest tier had greater cardiovascular disease risk than those with more moderate control.7PubMed Central. Low Blood Pressure Is Associated With Greater Risk for Cardiovascular Events in Treated Adults With and Without Apparent Treatment-Resistant Hypertension The relationship held regardless of whether the patient had treatment-resistant hypertension. The take-home point is that there is a sweet spot for treated blood pressure, and going below it does not provide extra protection.
Certain drug classes are more likely to cause symptomatic low blood pressure than others. Diuretics, for instance, appear to increase the likelihood of orthostatic hypotension, that dizzy feeling when you stand up. Calcium channel blockers, by contrast, seem to reduce that risk.8Journal of Hypertension. Orthostatic Hypotension in Patient With Hypertension and the Association of Antihypertensive Pharmacology Treatment Taking three or more blood pressure medications also appeared to increase orthostatic problems, though that association was less robust statistically. If you are on multiple medications and feeling lightheaded or unsteady, 108/65 might actually be lower than your doctor intended, and adjusting a dose could help.
Dehydration and After-Meal Drops
Two everyday situations can temporarily push your blood pressure below its normal resting value: not drinking enough water, and eating a large meal.
Dehydration shrinks your blood volume, which means less fluid is available to fill your arteries and maintain pressure. Research has documented that moderate dehydration can reduce plasma volume by about 11 percent, and when combined with standing, it causes a sharper drop in blood flow to the brain than standing while well hydrated.9PubMed. Effects of dehydration on cerebrovascular control during standing after heavy resistance exercise If your 108/65 was measured on a day when you hadn’t been drinking much water, your well-hydrated baseline might be a few points higher. This is also why blood pressure tends to be lowest in the morning, since most people go six to eight hours without fluids overnight.
Postprandial hypotension, the drop in blood pressure after eating, is another common and usually harmless phenomenon. After a meal, blood flow shifts toward the digestive organs. Research in older patients has shown that this redistribution of blood to the splanchnic circulation after eating can produce measurable drops in both systolic and diastolic pressure, with the magnitude of the systolic drop correlating to how much blood flow increases to the gut.10PubMed. Acarbose, the α-glucosidase inhibitor, attenuates the blood pressure and splanchnic blood flow responses to meal in elderly patients with postprandial hypotension concomitant with abnormal glucose metabolism In younger healthy people, the body compensates quickly and the drop is minimal. In older adults, especially those with diabetes or on blood pressure medications, the drop can be enough to cause dizziness within an hour of eating. Smaller, more frequent meals and avoiding large carbohydrate-heavy dishes can blunt the effect.
Blood Pressure During Pregnancy
Pregnancy causes substantial shifts in blood pressure, and readings around 108/65 are especially common during the second trimester. In a typical pregnancy, blood pressure drops from its pre-pregnancy baseline early on, reaching its lowest point around 22 weeks. One study tracking blood pressure across pregnancy found that systolic pressure rose from its 13-week baseline by a barely noticeable amount at 22 weeks but climbed steadily thereafter, rising about 5 mmHg by 28 weeks and nearly 8 mmHg by 36 weeks. Diastolic pressure showed a slight, nonsignificant dip at 22 weeks before rising to about 6 mmHg above baseline by late pregnancy.11PubMed Central. Mid-trimester blood pressure drop in normal pregnancy: myth or reality?
This mid-pregnancy dip is driven by hormonal changes that relax blood vessel walls, and it can make readings that would be perfectly normal outside of pregnancy feel a bit lower. Some women notice more lightheadedness during this period. As long as the reading is not extremely low and you are not symptomatic beyond mild positional dizziness, a blood pressure like 108/65 during pregnancy is no cause for alarm. The concern in pregnancy is high blood pressure, not low.
What Low-Salt Populations Reveal About “Normal” Blood Pressure
One reason a reading of 108/65 feels low to people living in industrialized countries is that we have calibrated our sense of normal against populations that eat enormous amounts of sodium and live with chronic stress. Studies of hunter-gatherer and other low-salt communities have found that the familiar rise in blood pressure with age simply does not occur in those groups.12American Journal of Hypertension. Epidemiologic Evidence on Salt and Blood Pressure Their blood pressures tend to stay in the low range throughout life.
Cross-sectional research comparing populations with different dietary sodium intakes has confirmed this pattern. A study of Cameroonian Pygmy and Bantu communities found that while blood pressure did increase with age in both groups, the increase was notably smaller in the Pygmy population, which had lower sodium intake.13PubMed Central. Association of urinary sodium excretion with blood pressure and risk factors associated with hypertension among Cameroonian pygmies and bantus: a cross-sectional study The implication is that what we think of as “normal” blood pressure in Western countries is partly an artifact of diet and lifestyle. In populations eating the way humans evolved to eat, a systolic reading around 110 is not low at all. It is just what blood pressure looks like in the absence of chronic sodium overload.
Practical Steps if You Are Worried About Your Reading
If 108/65 showed up on your monitor and you feel completely well, you can genuinely stop worrying. But if you landed on this article because something felt off, here are some practical considerations:
- Track over time: A single reading means almost nothing. Take readings at different times of day for a week and look at the trend.
- Note symptoms: Dizziness when standing, persistent fatigue, difficulty concentrating, or frequent near-fainting episodes are the signs that matter. Write down when they happen and what you were doing.
- Check hydration: If you are not drinking enough water, your blood pressure can dip below its true baseline. Try increasing fluid intake for a few days and see if the number changes.
- Review medications: If you take blood pressure drugs and your readings are frequently at or below 108/65, ask your doctor whether you might be over-treated. This is especially relevant if you are also experiencing dizziness or falls.
- Consider your age: Under 60, 108/65 is straightforwardly good. Over 70, it warrants a conversation about whether diastolic values in the mid-60s are affecting your balance, cognition, or energy levels.
Blood pressure numbers exist to serve a purpose: identifying risk before it becomes a problem. For the vast majority of people reading this article, 108/65 represents the absence of that risk. The reading becomes worth acting on only when it is paired with symptoms, a vulnerable age group, medication use, or a sudden change from your previous pattern. Without any of those, it is simply a sign that your cardiovascular system is doing its job quietly and well.