A healthy blood pressure is below 120/80 mmHg. That reading represents two measurements: the force of blood when your heart pumps (the top number) and the pressure between beats when your heart rests and refills (the bottom number). Once either number creeps above that threshold, your cardiovascular risk starts climbing. Starting at just 115/75 mmHg, your risk of heart disease and stroke doubles with every 20-point rise in the top number or 10-point rise in the bottom number.
Blood Pressure Categories
The 2025 guidelines from the American Heart Association and American College of Cardiology break blood pressure into four categories for adults:
- Normal: below 120/80 mmHg
- Elevated: 120 to 129 systolic (top number) with the bottom number still 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
If your top and bottom numbers fall into two different categories, the higher category is the one that applies. So a reading of 135/75 counts as stage 1 hypertension even though the bottom number looks fine. These thresholds are the same regardless of age. Previous guidelines gave people over 65 a more lenient target of 150/80, but that distinction was dropped. The result is that many older adults who were previously considered fine now fall into the elevated or high range.
What the Two Numbers Mean
Your systolic pressure (the top number) measures how hard blood pushes against your artery walls each time your heart contracts. Your diastolic pressure (the bottom number) measures the residual pressure while your heart relaxes between beats. Both numbers matter, but systolic pressure tends to rise more with age as arteries stiffen, which is why it often gets more attention in risk assessments for people over 50.
Think of it like water pressure in a hose. Systolic is the surge when the faucet is on full blast; diastolic is the baseline pressure that remains when flow eases. Consistently high pressure on either count damages artery walls over time, making them more prone to plaque buildup, weakening, and eventually leading to heart attacks or strokes.
When Blood Pressure Is Too Low
While most of the attention goes to high readings, blood pressure can also drop too low. A reading below 90/60 mmHg is generally considered low blood pressure, or hypotension. Symptoms include dizziness, blurred vision, fatigue, trouble concentrating, fainting, and nausea. A sudden drop of just 20 points in the top number, say from 110 to 90, can be enough to make you feel lightheaded or pass out.
That said, some people naturally run on the lower side without any problems. Most health professionals only consider low blood pressure a concern when it causes noticeable symptoms. If you feel fine at 95/60, that’s likely just your normal. Extreme drops, however, can lead to shock, which shows up as confusion, cold and clammy skin, rapid shallow breathing, and a weak pulse. That’s a medical emergency.
How Blood Pressure Is Diagnosed
A single reading doesn’t tell the full story. To confirm a diagnosis of high blood pressure, guidelines call for an average of at least two careful readings taken on at least two separate occasions. Blood pressure fluctuates throughout the day based on stress, activity, caffeine, and even the time you last ate, so one snapshot can be misleading.
White coat hypertension is a well-documented phenomenon where your numbers spike simply because you’re in a clinical setting. It affects 15% to 30% of people who show elevated readings in a doctor’s office. For this reason, home monitoring or ambulatory monitoring (wearing a cuff that takes readings over 24 hours) can give a more accurate picture of your true baseline.
How to Get an Accurate Reading
If you’re checking your blood pressure at home, small details in your technique can swing the result by 10 to 20 points in either direction. The CDC recommends this protocol for reliable readings:
- Timing: Avoid food, drinks, and caffeine for 30 minutes beforehand. Empty your bladder first.
- Position: Sit in a chair with your back supported for at least five minutes before measuring. Keep both feet flat on the floor with legs uncrossed.
- Arm placement: Rest your arm on a table so the cuff sits at chest height. The cuff should wrap directly against bare skin, not over a sleeve.
- During the reading: Don’t talk. Stay still.
Crossing your legs can raise your reading by several points. So can an unsupported back, a full bladder, or having the cuff over clothing. If you’re tracking trends at home, try to measure at the same time each day, ideally morning and evening, and record the averages rather than fixating on any single number.
What Pushes Blood Pressure Up
Several factors influence where your numbers land. Some you can control, others you can’t. Genetics play a significant role: if your parents had high blood pressure, your odds are higher. Age is another factor, since arteries naturally lose flexibility over time. Beyond that, the major drivers are lifestyle-related.
High sodium intake is one of the most direct influences. Excess salt causes your body to retain water, which increases blood volume and puts more pressure on artery walls. Physical inactivity weakens the heart over time, forcing it to work harder to circulate blood. Excess body weight, particularly around the midsection, increases the volume of blood your heart needs to pump and raises resistance in your blood vessels. Chronic stress, heavy alcohol use, and smoking all contribute as well, each through slightly different mechanisms but all converging on the same result: sustained pressure that your arteries weren’t designed to handle long-term.
Practical Ways to Lower Your Numbers
For people in the elevated or stage 1 range, lifestyle changes alone can often bring readings back to normal. Regular aerobic exercise, even brisk walking for 30 minutes most days, typically lowers systolic pressure by 5 to 8 points. Reducing sodium intake makes a measurable difference, with most guidelines recommending staying under 2,300 mg per day and ideally closer to 1,500 mg. That means less processed food, restaurant meals, and packaged snacks, which account for the vast majority of sodium in most diets.
Losing even a modest amount of weight helps. Roughly every 2 pounds lost translates to about a 1-point drop in blood pressure. Increasing potassium through fruits, vegetables, and legumes helps counterbalance sodium’s effects. Limiting alcohol to one drink per day for women or two for men, managing stress, and getting consistent sleep all contribute as well. None of these changes works in isolation the way a pill does, but together they can add up to a meaningful reduction.
For people in stage 2 or those with additional risk factors like diabetes or existing heart disease, medication is typically part of the plan alongside these same lifestyle changes. The goal is generally to get below 130/80, though your specific target may vary based on your overall health profile.