A systolic reading of 145 (the top number) is high blood pressure. It falls above the 140 mm Hg threshold where current guidelines recommend medication in addition to lifestyle changes for all adults, regardless of other risk factors. A single reading of 145 doesn’t necessarily mean you have a chronic problem, but if your readings consistently land in this range, it’s worth taking seriously.
Where 145 Falls in Blood Pressure Categories
Blood pressure is recorded as two numbers: systolic (the pressure when your heart beats) over diastolic (the pressure between beats). Normal blood pressure is below 120/80 mm Hg. Readings between 120-129 systolic with a diastolic under 80 are considered elevated. Once you reach 130/80, you’re in the hypertension range.
At 145 systolic, you’re above the 140/90 mark where the 2025 American Heart Association guidelines recommend starting blood pressure medication for all adults with hypertension. For people with diabetes, chronic kidney disease, heart disease, or a history of stroke, medication is recommended even earlier, at 130/80 or above. The recommended treatment target for most adults is under 130/80, which means a reading of 145 is about 15 points above where your doctor would want you to be.
Why 145 Systolic Matters for Your Health
Sustained high systolic pressure puts extra force on your artery walls with every heartbeat. Over time, this damages blood vessels throughout the body and forces the heart to work harder than it should. The Mayo Clinic notes that a chronically elevated top number raises your risk of stroke, heart disease, dementia, and chronic kidney disease. These risks increase gradually as blood pressure climbs, so 145 carries more risk than 135 but less than 160. There’s no sharp cutoff where damage suddenly begins.
Some people have high systolic pressure but a normal diastolic number (under 80). This pattern, called isolated systolic hypertension, is common in older adults as arteries stiffen with age. It’s not a “mild” form of high blood pressure. It carries real cardiovascular risk and is treated the same way.
Make Sure the Reading Is Accurate
Before worrying about a single 145 reading, it’s important to confirm it’s accurate. Blood pressure fluctuates throughout the day and can spike from stress, caffeine, a full bladder, or simply rushing into a clinic. “White coat hypertension,” where readings run high only in a medical setting, is common enough that doctors typically want multiple readings before making a diagnosis.
The CDC recommends this technique for reliable home readings:
- Sit quietly for at least 5 minutes in a comfortable chair with your back supported before measuring.
- Position your arm at chest height by resting it on a table with the cuff at heart level.
- Take at least two readings spaced 1 to 2 minutes apart, and use the average.
If your home readings consistently average around 145 systolic over several days, that pattern is clinically meaningful. If you get 145 once but your other readings are in the 120s, the single high number is likely situational.
What Happens at This Level
At a consistent 145 systolic, your doctor will likely recommend both lifestyle changes and medication. The evidence is clear on this point: clinical trials and large-scale analyses show that starting blood pressure treatment at or above 140 systolic reduces the rate of heart attacks, strokes, and other cardiovascular events. Waiting to see if lifestyle changes alone bring the number down is a common approach at lower levels, but at 145, most guidelines support starting medication alongside those changes.
Blood pressure medication doesn’t have to be permanent in every case. Some people bring their numbers down far enough through diet, exercise, weight loss, and sodium reduction that their doctor can reduce or stop medication over time. But the medication provides a safety net while those changes take effect.
How Much Lifestyle Changes Can Lower Your Numbers
Diet is one of the most effective non-drug tools for lowering blood pressure. The DASH diet, which emphasizes fruits, vegetables, whole grains, and low-fat dairy while limiting saturated fat and added sugar, has been studied extensively. In a major trial funded by the National Heart, Lung, and Blood Institute, the DASH diet combined with lower sodium intake reduced systolic blood pressure by an average of 8.9 mm Hg compared to a typical American diet with higher sodium. Even a moderate sodium reduction on the DASH plan dropped systolic pressure by about 7.2 mm Hg.
Those numbers matter when you’re starting at 145. An 8 to 9 point drop from diet alone would bring you close to the 135 range. Combined with medication, regular aerobic exercise (which can lower systolic pressure by another 4 to 8 points), and weight loss if you’re carrying extra weight, reaching a target under 130 is realistic for most people.
Sodium is worth special attention. The same trial showed that simply cutting sodium on a standard American diet, without any other dietary changes, lowered systolic pressure by about 6.7 mm Hg. Most people consume far more sodium than they realize, since the majority comes from processed and restaurant foods rather than the salt shaker.
If 145 Is Your Diastolic Number
If 145 is your bottom number rather than your top, that’s a much more urgent situation. Normal diastolic pressure is under 80 mm Hg. A diastolic reading of 145 would be extremely high and could indicate a hypertensive crisis, which the Mayo Clinic defines as a reading of 180/120 or higher. At that level, you should seek immediate medical attention, especially if you’re experiencing symptoms like chest pain, shortness of breath, severe headache, or vision changes. Even without symptoms, a diastolic reading that high warrants prompt evaluation.