A systolic blood pressure of 143 is high. Under current guidelines from the American College of Cardiology and American Heart Association, any reading at or above 140 systolic falls into Stage 2 hypertension, the more serious of two hypertension categories. While 143 is not a medical emergency, it sits in a range that carries meaningful cardiovascular risk and typically calls for treatment beyond lifestyle changes alone.
Where 143 Falls on the Blood Pressure 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. The current classification system breaks down like this:
- Normal: below 120/80
- 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 143, you’re three points into Stage 2 territory. If your systolic and diastolic numbers fall into different categories, the higher category is the one that applies. So even if your bottom number looks fine, a top number of 143 alone puts you in Stage 2.
That said, a single reading of 143 does not automatically mean you have hypertension. A diagnosis requires two or more elevated readings taken on different days, then averaged together. Blood pressure fluctuates throughout the day based on stress, caffeine, physical activity, and even the position of your arm during measurement. One high reading is a signal to keep checking, not a final verdict.
White Coat Effect: Could the Reading Be Misleading?
Some people consistently get higher readings in a clinical setting than they do at home. This phenomenon, called white coat hypertension, affects 15% to 30% of people who show elevated blood pressure in a doctor’s office. The anxiety of a medical visit can temporarily push your numbers up by 10 or more points.
If your reading of 143 was taken in a clinic, home monitoring can help clarify the picture. Using a validated home blood pressure monitor, take readings in the morning and evening for several days, sitting quietly for five minutes before each measurement. If your home readings consistently come in below 130, your doctor may interpret the 143 differently than if your home numbers confirm it.
Why the 140s Range Matters for Your Health
A systolic reading in the low 140s might not feel dramatically different from 135 or 138, but the cardiovascular risk climbs with each point. Data from the Northern Manhattan Study found that people with systolic blood pressure between 140 and 149 had a 72% increased risk of stroke compared to those below 140. That’s a substantial jump, and it held up even after researchers accounted for other risk factors like age, smoking, and cholesterol.
Research in people with diabetes and chronic kidney disease paints a similar picture. Compared to people with systolic readings in the 130 to 139 range, those in the 140 to 149 range had an 11% higher rate of cardiovascular events like heart attacks and heart failure. The relationship between blood pressure and cardiovascular risk follows a continuous pattern: the lower you go (down to about 120), the lower your risk.
How 143 Is Typically Treated
For Stage 2 hypertension, guidelines recommend starting medication alongside lifestyle changes rather than trying lifestyle changes alone first. This is different from Stage 1, where younger, lower-risk patients might get three to six months to bring their numbers down through diet and exercise before medication enters the conversation.
The urgency of treatment also depends on your overall risk profile. If you have diabetes, kidney disease, existing heart disease, or a 10-year cardiovascular risk score of 10% or higher, the case for prompt medication is stronger. But even without those factors, a confirmed reading of 143 generally warrants a conversation about medication because you’re past the threshold where lifestyle changes alone are considered sufficient as a first step.
Lifestyle changes still matter alongside medication. A structured program combining the DASH diet (rich in fruits, vegetables, whole grains, and low-fat dairy while limiting sodium and saturated fat) with regular aerobic exercise has been shown to lower systolic blood pressure by about 12 points. Even self-directed efforts at healthier eating and more movement produce average reductions of around 7 points. For someone at 143, that kind of drop could be the difference between Stage 2 hypertension and a much healthier range.
What About Older Adults?
Blood pressure targets get more nuanced with age. Guidelines vary on exactly where to set the bar for people over 65. Some recommend targets below 130/80, while others allow up to 150/90 for older adults. For people 80 and older, at least one guideline suggests not starting treatment until systolic pressure exceeds 160.
However, a Cochrane review of the evidence found that lower targets (below 140) reduced the risk of stroke more effectively than higher targets (below 150 to 160) in older adults. Lower targets also appeared to reduce serious cardiac events and deaths from heart disease. The review noted that frail individuals or those over 80 may have different risk-benefit profiles, but for most older adults, conventional targets remain appropriate. In other words, 143 is still worth addressing even if you’re in your 70s.
Is 143 a Medical Emergency?
No. A hypertensive crisis, the level that requires emergency care, starts at 180/120 or higher. At 143, you’re well below that threshold. There’s no need for an emergency room visit based on this number alone. The appropriate next step is scheduling an appointment with your primary care provider, monitoring your blood pressure at home in the meantime, and bringing those readings with you. If you do see a number above 180 systolic or 120 diastolic, especially with symptoms like chest pain, dizziness, or vision changes, that’s a different situation entirely and warrants immediate medical attention.