A systolic blood pressure of 145 mmHg falls into stage 2 hypertension, the most serious category of high blood pressure under current guidelines. The American Heart Association and American College of Cardiology define stage 2 hypertension as a systolic (top number) reading of 140 mmHg or higher, or a diastolic (bottom number) of 90 or higher. So yes, 145 is high, and it’s the level where medication is typically recommended alongside lifestyle changes.
Where 145 Falls on the Scale
Blood pressure is measured in two numbers. The top number (systolic) reflects pressure when your heart beats, and the bottom number (diastolic) reflects pressure between beats. Current guidelines break these readings into categories:
- Normal: below 120/80 mmHg
- Elevated: 120 to 129 systolic, with diastolic below 80
- Stage 1 hypertension: 130 to 139 systolic, or 80 to 89 diastolic
- Stage 2 hypertension: 140 or higher systolic, or 90 or higher diastolic
At 145, you’re 5 points into stage 2. That said, a single reading doesn’t define your blood pressure. Doctors look at the average of multiple readings taken on different days before making a diagnosis. Stress, caffeine, a full bladder, or even sitting the wrong way during a reading can temporarily push your numbers higher than they actually are.
How to Get an Accurate Reading
If you saw 145 on a home monitor or at a pharmacy kiosk, it’s worth checking whether the reading was taken correctly. Small mistakes can inflate your numbers significantly. The CDC recommends the following steps for an accurate measurement:
- Avoid food, drinks, and caffeine for 30 minutes beforehand.
- Empty your bladder before measuring.
- Sit quietly for at least 5 minutes with your back supported in a comfortable chair.
- Keep both feet flat on the floor with legs uncrossed.
- Rest your arm on a table at chest height, not dangling at your side.
- Place the cuff on bare skin, not over clothing.
- Don’t talk during the reading.
Crossing your legs or letting your arm hang down can push your reading higher than your actual blood pressure. If you retake the measurement following these steps and still see numbers around 145, that’s a reading worth discussing with a healthcare provider.
Health Risks at This Level
A sustained systolic pressure around 145 puts extra force on your artery walls with every heartbeat. Over time, this damages blood vessels throughout the body, particularly in the heart, brain, kidneys, and eyes. The risks include stroke, heart attack, heart failure, chronic kidney disease, and dementia. Research from the AHA shows that for every 10 mmHg increase in systolic pressure, the risk of recurrent stroke rises measurably, even after accounting for other factors like age, diabetes, and smoking.
An NIH-funded trial called SPRINT found that lowering systolic blood pressure to below 120 in adults age 50 and older significantly reduced cardiovascular events and death. That gives you a sense of how much distance there is between 145 and where the strongest protective benefits begin.
What If Only the Top Number Is High?
Some people have a systolic reading around 145 while their diastolic stays below 80. This pattern is called isolated systolic hypertension, and it’s especially common in older adults. It happens because arteries stiffen with age, forcing the heart to pump harder. Other contributing factors include an overactive thyroid, diabetes, heart valve problems, and obesity.
Don’t let a “normal” bottom number give you false reassurance. An elevated top number on its own raises the risk of stroke, heart disease, dementia, and kidney damage over time. It needs the same attention as any other form of high blood pressure.
Treatment at Stage 2
Current guidelines recommend starting blood pressure medication for all adults with an average reading of 140/90 or higher. At 145, that threshold is already crossed. Medication may also be recommended at lower readings (130/80 and above) for people who have diabetes, kidney disease, existing heart disease, or a calculated 10-year cardiovascular risk of 7.5% or higher.
For older adults, the treatment target can be more flexible. Doctors weigh overall health, other medications, and the risk of side effects like dizziness or falls. The goal is usually still to bring numbers down meaningfully, but the exact target varies from person to person.
Lifestyle Changes That Lower Blood Pressure
Lifestyle changes can make a real dent in a reading of 145, sometimes enough to bring you down a full stage or more. The most effective changes, based on data from the Mayo Clinic, each shave several points off your systolic number:
Adopting a diet rich in fruits, vegetables, whole grains, and low-fat dairy while cutting saturated fat can lower systolic pressure by up to 11 mmHg. This approach, often called the DASH diet, is one of the most powerful non-drug interventions available. Cutting sodium to 1,500 mg per day (roughly two-thirds of a teaspoon of salt) can lower it by another 5 to 6 mmHg. Regular aerobic exercise, like brisk walking, cycling, or swimming for at least 30 minutes most days, reduces systolic pressure by about 5 to 8 mmHg.
If you combined all three, you could theoretically lower your systolic reading by 20 or more points, which would bring 145 down into a much safer range. In practice, the reductions overlap and vary between individuals, but the combined effect is substantial. Losing excess weight, limiting alcohol, managing stress, and getting enough sleep all contribute additional benefit.
At 145, most providers will recommend starting these changes alongside medication rather than waiting several months to see if lifestyle alone is enough. That’s because stage 2 hypertension carries enough near-term risk that waiting can be counterproductive.
Warning Signs That Need Immediate Attention
A reading of 145 is not a medical emergency on its own. However, if your blood pressure reaches 180/120 or higher and you experience chest pain, shortness of breath, severe headache, or symptoms of a stroke (sudden numbness, confusion, vision changes, or trouble speaking), that’s a hypertensive crisis. Call 911 immediately. A reading of 145 without these symptoms is something to address promptly with your doctor, not in the emergency room.