Yes, 148/98 is high blood pressure. Under the current classification system used by the American Heart Association and American College of Cardiology, a reading of 148/98 falls into stage 2 hypertension, which is the most serious category before a hypertensive crisis. Both numbers independently qualify: stage 2 begins at 140 systolic or 90 diastolic, and your reading exceeds both thresholds.
Where 148/98 Falls on the Scale
Blood pressure is classified into four categories based on the 2025 AHA/ACC guidelines:
- Normal: below 120/80
- Elevated: 120 to 129 systolic and below 80 diastolic
- Stage 1 hypertension: 130 to 139 systolic or 80 to 89 diastolic
- Stage 2 hypertension: 140 or higher systolic, or 90 or higher diastolic
When the two numbers fall into different categories, the higher category applies. In your case, both 148 and 98 point to stage 2, so there’s no ambiguity. This isn’t an emergency reading (that threshold is 180/120), but it’s high enough that treatment guidelines recommend medication alongside lifestyle changes rather than lifestyle changes alone.
Make Sure the Reading Is Accurate
Before acting on a single reading, it’s worth knowing that blood pressure measurements are surprisingly easy to distort. The CDC notes that as many as 1 in 3 people who get a high reading at a doctor’s office actually have normal blood pressure outside of it, a phenomenon called white coat syndrome.
Common things that inflate a reading include drinking caffeine or alcohol within 30 minutes, smoking, exercising beforehand, crossing your legs, letting your arm hang at your side instead of resting it on a table, or talking during the measurement. Even a full bladder can push numbers up. To get a reliable reading, sit with your back supported for at least five minutes, feet flat on the floor, arm resting on a table at chest height, cuff on bare skin. Don’t eat, drink, or exercise for 30 minutes before measuring.
A diagnosis of hypertension is based on your average blood pressure across multiple readings, not a single measurement. If you saw 148/98 once on a home monitor, take several readings over a few days under proper conditions. If the numbers consistently stay in this range, it’s genuinely elevated.
What This Level Does to Your Body Over Time
Stage 2 hypertension puts extra force on your artery walls with every heartbeat. Over months and years, this damages blood vessels throughout your body and forces your heart to work harder than it should. The organs most vulnerable to sustained high blood pressure are the heart, brain, kidneys, and eyes.
The kidney impact is well documented. Research tracking hypertensive men found that for every 18-point increase in systolic blood pressure, kidney filtration declined by an additional 0.92 mL per minute per year. That may sound small, but it compounds. Men with blood pressure at or above 160/95 lost kidney function more than five times faster than those under 140/90. At 148/98, you’re in the zone where the risk is climbing, even if it hasn’t reached the steepest part of the curve yet. Uncontrolled blood pressure at this level also contributes to thickening of the heart muscle, narrowing of arteries in the brain, and damage to the small blood vessels in the retina.
How Treatment Works at This Level
Current guidelines recommend that everyone with an average blood pressure of 140/90 or higher start medication in addition to lifestyle changes. This applies even if you have no other health conditions. For stage 2 hypertension specifically, the preferred approach is starting with two blood pressure medications from different classes combined into a single pill. This isn’t because your situation is dire. It’s because a single medication often isn’t enough to bring stage 2 numbers into a healthy range, and combining two drugs in one pill makes it easier to stay consistent.
If you also have diabetes, chronic kidney disease, heart disease, or a prior stroke, the threshold for medication is actually lower (130/80), so treatment at 148/98 would be especially important.
What Lifestyle Changes Can Actually Achieve
Diet and behavior changes are not optional extras alongside medication. They make a measurable difference, sometimes enough to reduce or eventually eliminate the need for drugs.
Cutting sodium intake is one of the most effective single changes. In people with hypertension who followed a standard diet but reduced their sodium from high to low, systolic blood pressure dropped by about 4.5 points after one week and 8.4 points after four weeks. Diastolic pressure dropped by about 4.6 points over the same period. Those are meaningful reductions. If your reading is 148/98, an 8-point systolic drop from sodium reduction alone brings you close to the stage 1 range.
The DASH diet (rich in fruits, vegetables, whole grains, and low-fat dairy, while limiting saturated fat and red meat) adds further benefit. Compared to a typical diet, DASH lowered systolic blood pressure by about 4.4 points within the first week, with most of the benefit appearing almost immediately. Combining the DASH diet with sodium reduction produced even larger drops. In hypertensive participants who did both, systolic pressure fell by about 5 points in the first week and continued improving over four weeks.
Other changes that reliably lower blood pressure include regular aerobic exercise (even brisk walking for 30 minutes most days), losing weight if you’re carrying extra pounds, moderating alcohol intake, and managing stress. None of these work overnight, but together they can shift your numbers by 10 to 20 points over several months.
Warning Signs That Need Immediate Attention
A reading of 148/98 is not an emergency, but it’s worth knowing the line. If your blood pressure ever reaches 180/120 or higher and you experience chest pain, shortness of breath, back pain, numbness, weakness, vision changes, or difficulty speaking, call 911. That combination signals a hypertensive emergency where organs may be actively sustaining damage. At 148/98 without those symptoms, you have time to address this through your regular doctor, but you shouldn’t wait months to do so.