A blood pressure reading of 93/73 mmHg sits well below the conventional 120/80 benchmark, but it doesn’t automatically mean something is wrong. Many people, particularly younger women and endurance athletes, walk around with systolic pressures in the low 90s and feel perfectly fine. What makes 93/73 worth a second look isn’t so much the low overall numbers as the narrow gap between them: a pulse pressure of just 20 mmHg, which falls below the range most clinicians consider healthy.
Why the 20-Point Gap Matters More Than You Think
When your blood pressure reads 93/73, the top number (systolic) reflects the force of your heart pushing blood out, and the bottom number (diastolic) reflects the pressure in your arteries between beats. The difference between the two is your pulse pressure, and in this case it’s 93 minus 73, which equals 20 mmHg. A healthy resting pulse pressure is roughly 40 mmHg. A widely used clinical threshold puts the lower limit at 25% of the systolic value; for a systolic of 93, that works out to about 23 mmHg.1Europe PMC. Physiology, Pulse Pressure At 20, this reading falls below that cutoff.
A narrow pulse pressure often reflects reduced stroke volume, meaning the heart is pumping less blood with each beat. That can happen for benign reasons like being mildly dehydrated or having a naturally smaller heart, but it can also point toward heart failure, significant blood loss, or aortic valve problems. On its own, a single reading of 20 mmHg doesn’t diagnose anything. But if repeated measurements consistently show a pulse pressure below the mid-20s, it’s something to bring up with a doctor rather than shrug off.
When Low Blood Pressure Actually Causes Symptoms
Plenty of people with systolic pressures in the 90s never notice anything unusual. The body adapts to its own baseline, and a number that would make one person dizzy can be completely unremarkable for another. That said, population data does show a link between lower systolic blood pressure and symptoms like tiredness and feeling faint, with the association strongest in women under 50.2PubMed. Symptoms of low blood pressure: a population study
The symptoms worth paying attention to include lightheadedness when standing, persistent fatigue that doesn’t improve with sleep, blurred vision, difficulty concentrating, and nausea. If you have a blood pressure of 93/73 and none of these bother you, your reading is likely just your normal. If these symptoms are part of your daily experience, the reading starts to tell a different story.
One reason clinicians don’t panic about low blood pressure on its own is that what matters most to your organs is mean arterial pressure, the average pressure driving blood through your tissues over each heartbeat. For a reading of 93/73, that works out to roughly 80 mmHg, which is comfortably above the threshold where organs start struggling. Research on arterial pulse waveforms in healthy adults found average mean arterial pressure values around 74 mmHg.3PubMed Central. Optimal Calculation of Mean Pressure From Pulse Pressure So even though 93/73 looks low on paper, the perfusion pressure keeping your brain and kidneys supplied is probably adequate, assuming you’re at rest and not standing suddenly.
Common Reasons Blood Pressure Settles This Low
If 93/73 is new for you or represents a drop from your usual readings, it’s worth thinking through what might have shifted. The causes range from completely harmless to medically significant.
Medications are one of the most frequent culprits. Blood pressure drugs at standard doses lower systolic pressure by roughly 7 to 9 mmHg and diastolic by about 4 to 6 mmHg, and those effects stack up when drugs are combined.4BMJ. Value of low dose combination treatment with blood pressure lowering drugs: analysis of 354 randomised trials But it’s not only blood pressure medications that push you low. Antidepressants, antipsychotics, drugs for Parkinson’s disease, and alpha-blockers prescribed for prostate issues all interfere with the body’s ability to maintain blood pressure, particularly when you stand up.5PubMed Central. Drug-Related Orthostatic Hypotension: Beyond Anti-Hypertensive Medications If you’re on any of these and seeing readings in the low 90s for the first time, a dosage conversation with your prescriber is reasonable.
Dehydration is another common and easily reversible cause. When blood volume drops, systolic pressure tends to follow. One study in young healthy adults found a significant relationship between fluid loss and lower central systolic blood pressure.6PubMed. Effects of dehydration on central blood pressure in young healthy adults The body fights back by ramping up sympathetic nerve activity to squeeze blood vessels and keep pressure from cratering.7PubMed Central. Blood pressure is maintained during dehydration by hypothalamic paraventricular nucleus-driven tonic sympathetic nerve activity But that compensatory mechanism has limits, especially when you’re exercising upright. Research on dehydrated individuals found that standing exercise lowered mean arterial pressure by about 6 mmHg compared to the hydrated state, while the same exercise performed lying down didn’t produce a significant drop.8PubMed. Supine exercise restores arterial blood pressure and skin blood flow despite dehydration and hyperthermia If your 93/73 reading came after a hot day, a hard workout, or simply not drinking enough, hydration alone might bring the numbers up.
Pregnancy naturally lowers blood pressure, especially in the first and second trimesters. A large prospective study found that average diastolic blood pressure in early pregnancy was about 66 to 67 mmHg, with pressures gradually climbing back only after 34 weeks of gestation.9BMJ. Maternal blood pressure in pregnancy, birth weight, and perinatal mortality in first births: prospective study A reading of 93/73 in your first or second trimester is well within the expected range and usually not a concern unless accompanied by severe dizziness or fainting.
Endocrine disorders are rarer but more serious. Adrenal insufficiency, where the adrenal glands don’t produce enough cortisol and aldosterone, can cause persistently low blood pressure, sudden drops when standing, salt cravings, and skin darkening. In severe cases it can progress to adrenal crisis with dangerously low blood pressure and confusion.10JAMA. What Is Adrenal Insufficiency? Thyroid problems and other hormonal conditions can also contribute, though these typically come with other noticeable symptoms beyond a low number on the cuff.
The Orthostatic Drop Problem
The real risk with a resting blood pressure of 93/73 isn’t the number itself. It’s what happens when you stand up. Orthostatic hypotension is defined as a drop of 20 mmHg or more in systolic pressure, or 10 mmHg or more in diastolic pressure, within a few minutes of moving from lying down to standing.11Journal of Human Hypertension. Postural changes in blood pressure and the prevalence of orthostatic hypotension among home-dwelling elderly aged 75 years or older If you start at 93 systolic and lose 20 points on standing, you’re at 73 systolic or lower, which is low enough to make the room spin and put you at risk for a fall.
That same study of elderly adults living at home found that about a third met the criteria for orthostatic hypotension, and more than half had some degree of systolic drop when they stood up. Aging makes the problem worse because the reflexes that normally tighten blood vessels when you stand slow down over time. Medications compound it further, since many cardiovascular and psychoactive drugs blunt those same compensatory reflexes.12PubMed Central. Drug-Related Orthostatic Hypotension: Beyond Anti-Hypertensive Medications A medication review is one of the most straightforward interventions here, since adjusting a dose or swapping a drug can sometimes resolve the problem entirely.
If you notice dizziness or graying vision when you get out of bed or stand from a chair and your resting blood pressure already sits in the low 90s, mention both the symptoms and the baseline reading to your doctor. Clinicians tend to focus on high blood pressure; orthostatic drops from an already-low baseline sometimes get less attention than they deserve.
Could the Reading Be Wrong?
Before taking any 93/73 reading too seriously, consider whether the measurement itself was accurate. Cuff size is the biggest source of error in standard blood pressure measurements, and most people don’t give it a second thought. A study that tested different cuff sizes on the same people found that using a regular cuff on someone who actually needed an extra-large one inflated the systolic reading by about 19.5 mmHg. In the other direction, using a regular cuff on someone with a small arm lowered the systolic reading by about 3.6 mmHg.13PubMed Central. Effects of Cuff Size on the Accuracy of Blood Pressure Readings
What this means for a 93/73 reading depends on your arm size. If you have a thin arm and the clinic or home monitor used a standard adult cuff, the device may have underestimated your true pressure by a few points. If you have a larger arm and the cuff was too small, your true blood pressure could be even lower than 93/73, making the narrow pulse pressure more concerning. Body position matters too: crossing your legs, supporting your arm at the wrong height, or talking during the reading can all shift the numbers by several points in either direction.
Home monitors add another layer of uncertainty. Many wrist-style monitors are less reliable than upper-arm models, and even good monitors need periodic calibration checks against a reading taken in your doctor’s office. A single reading taken under imperfect conditions is a rough estimate, not a diagnosis. If 93/73 worries you, the answer is to take several readings over multiple days, ideally sitting quietly for five minutes beforehand with your arm supported at heart level, and bring that collection of numbers to your next appointment.
Autonomic Conditions and Chronically Low Readings
Some people have blood pressure that stays stubbornly low because the nervous system that regulates it doesn’t function normally. The autonomic nervous system constantly adjusts heart rate and blood vessel tone in response to movement, stress, temperature, and meals. When that system misfires, blood pressure can swing unpredictably or settle at levels that cause symptoms.
Familial dysautonomia is a rare genetic condition that illustrates how this works at an extreme. Patients have a faulty baroreflex, the feedback loop that senses blood pressure and corrects it. During tilt-table tests that simulate standing, their blood pressure dropped markedly and, unlike other patients with autonomic failure, their heart rate actually decreased at the same time, stripping them of multiple compensatory mechanisms at once.14Neurology. Afferent baroreflex failure in familial dysautonomia That’s an extreme example, but milder forms of autonomic dysfunction are more common than most people realize and can explain chronically low blood pressure in otherwise healthy-seeming people.
Nutritional deficiencies can also affect autonomic blood pressure control. One case report documented a 90-year-old woman whose orthostatic hypotension and near-fainting episodes resolved after treatment for vitamin B12 deficiency.15PubMed Central. Orthostatic hypotension as a manifestation of vitamin B12 deficiency That’s a single case, so it doesn’t prove B12 commonly causes low blood pressure, but it’s a useful reminder that unexplained low readings sometimes have correctable causes hiding in routine bloodwork.
How Naturally Low Differs From Dangerously Low
A point that tends to get lost in conversations about low blood pressure is that many people with readings in the 90s over 60s or 70s are not only healthy but may actually be at lower cardiovascular risk than people with pressures closer to 120/80. Studies of young healthy men across a range of blood pressures found that those in the lowest group, with average intraarterial readings around 116/62, had the lowest baseline levels of stress hormones like epinephrine and norepinephrine. Those in the highest group showed a clear upward trend in those markers.16Hypertension. Sympathetic activity and cardiovascular risk factors in young men in the low, normal, and high blood pressure ranges Lower resting sympathetic activity is generally a sign that the cardiovascular system is working efficiently, not struggling.
The distinction between “naturally low” and “pathologically low” boils down to two things: whether you have symptoms and whether the numbers are changing. A stable 93/73 in someone who feels well and has checked it multiple times is a very different finding from a 93/73 in someone who used to run 125/80 and now feels lightheaded every morning. The first scenario calls for nothing more than an occasional check-in. The second calls for a conversation about what changed, whether medications were adjusted, and whether any underlying conditions need screening.
If you’re tracking your blood pressure at home and consistently seeing numbers in this range, keep a log that includes the time of day, your body position, and whether you’d eaten or exercised recently. Those details give your doctor far more to work with than a single reading. And if the narrow pulse pressure persists across multiple readings, mention it specifically. It’s the kind of finding that might not trigger alarm in a quick office visit but could prompt useful follow-up when flagged by a patient who’s been paying attention.