If your blood pressure reading is high, what you should do depends on how high it is and whether you have symptoms. A reading of 180/120 mm Hg or greater with symptoms like chest pain, shortness of breath, or sudden numbness is a medical emergency. Call 911 immediately. A high reading without symptoms calls for a calmer, more measured response: sit down, relax for a few minutes, and recheck. If it’s still elevated, contact your doctor the same day.
For readings that fall in the mildly to moderately elevated range, the steps below can help you bring your numbers down both immediately and over time.
Know Your Numbers First
The American Heart Association’s 2025 guidelines break blood pressure into four categories:
- Normal: below 120/80 mm Hg
- Elevated: 120 to 129 systolic (top number) and below 80 diastolic (bottom number)
- Stage 1 hypertension: 130 to 139 systolic or 80 to 89 diastolic
- Stage 2 hypertension: 140/90 mm Hg or higher
If your top number and bottom number fall into different categories, the higher category is the one that applies to you. A single high reading isn’t a diagnosis, but consistently elevated numbers mean it’s time to act.
Make Sure Your Reading Is Accurate
A surprisingly high reading may simply be a bad measurement. The CDC recommends sitting in a comfortable chair with your back supported for at least five minutes before checking. Both feet should be flat on the ground, legs uncrossed, and the cuffed arm resting on a table at chest height. The cuff goes against bare skin, not over a sleeve. Don’t talk during the measurement.
White coat hypertension, where blood pressure spikes in a medical setting but is normal at home, affects 15% to 30% of people diagnosed with high blood pressure. If your in-office readings hit 140/90 or higher but your home readings stay below 135/85, your doctor may order 24-hour ambulatory monitoring to get the full picture. Investing in a validated home monitor and checking at the same times each day gives you far more reliable data than a single reading at the pharmacy or clinic.
What to Do Right Now to Lower a High Reading
If you’ve just gotten a high reading and have no emergency symptoms, slow breathing is the fastest tool available. Practicing slow, deep breathing for about 15 minutes can reduce systolic pressure (the top number) by up to 10 points. Two effective patterns:
- 4-7-8 breathing: Inhale for 4 counts, hold for 7, exhale for 8.
- Box breathing: Inhale for 4 counts, hold for 4, exhale for 4, hold for 4.
Beyond the immediate moment, making this a daily habit pays off. A 2021 study in the Journal of the American Heart Association found that a resistance-breathing technique done for just 30 breaths a day, six days a week, lowered systolic pressure by an average of 9 points within six weeks.
When a High Reading Is an Emergency
A reading of 180/120 mm Hg or higher is a hypertensive crisis. There are two types. In an urgent crisis, the numbers are dangerously high but no organs are being damaged yet. In an emergency crisis, organs like the heart, brain, or kidneys are actively under threat. The symptoms that distinguish the second from the first include chest pain, shortness of breath, severe headache, vision changes, and stroke signs like sudden numbness or tingling in the face, arm, or leg (often on just one side).
If your reading is 180/120 or higher at home and you feel fine, relax for a few minutes and measure again. If it stays that high, get medical attention promptly. If you have any of the symptoms listed above, call 911. Do not drive yourself.
Exercise Brings Lasting Reductions
Regular aerobic activity, things like brisk walking, cycling, or swimming, lowers blood pressure by 4 to 10 points systolic and 5 to 8 points diastolic. That’s roughly the same effect as a single blood pressure medication. You don’t need intense workouts. Aim for about 150 minutes per week of moderate activity, which breaks down to around 30 minutes on most days.
The blood pressure benefit comes from consistency, not intensity. If you haven’t been active, start with 10- to 15-minute walks and build from there. Your numbers typically begin improving within a few weeks, but they’ll climb back up if you stop.
Change What You Eat
The DASH eating plan (Dietary Approaches to Stop Hypertension) is the most studied dietary pattern for blood pressure and focuses on fruits, vegetables, whole grains, lean protein, and low-fat dairy while limiting saturated fat and added sugars. But the single most impactful change for most people is reducing sodium.
The standard target is under 2,300 mg of sodium per day, roughly one teaspoon of table salt. Dropping further to 1,500 mg per day lowers pressure even more. Most dietary sodium comes not from the salt shaker but from processed and restaurant foods: bread, deli meats, canned soups, frozen meals, and sauces. Reading nutrition labels and cooking more meals at home are the most practical ways to cut back. Increasing potassium-rich foods like bananas, potatoes, spinach, and beans also helps because potassium counteracts sodium’s effect on blood vessel walls.
Sleep Quality Matters More Than You Think
Sleeping fewer than five hours a night significantly increases hypertension risk, especially for people under 60. The sweet spot is seven to eight hours. Sleeping substantially more or less than that range is associated with higher blood pressure.
Sleep apnea deserves special attention. Research shows a direct correlation between the severity of sleep-disordered breathing and the development of hypertension four years later, independent of weight or other risk factors. If you snore heavily, wake up gasping, or feel exhausted despite what seems like enough sleep, getting evaluated for sleep apnea could be one of the most important things you do for your blood pressure. Treating it with a CPAP device, positional adjustments, or weight loss often improves blood pressure alongside sleep quality.
Where Supplements Fit In
Magnesium is the most studied supplement for blood pressure, and the evidence is modest but real. A large meta-analysis of randomized trials found that magnesium supplementation lowered systolic pressure by about 3 points and diastolic by about 2 points on average. The median dose across studies was 365 mg of elemental magnesium per day, taken for around 12 weeks.
Interestingly, the benefit was much larger for people already taking blood pressure medication: those individuals saw systolic drops of nearly 8 points. People with low magnesium levels also responded more strongly, with systolic reductions of about 6 points. There was no dose-response relationship, meaning taking more magnesium didn’t produce bigger drops. A moderate daily dose appears to be enough. Magnesium is not a replacement for medication or lifestyle changes, but it can be a useful addition.
Putting It All Together
High blood pressure rarely has a single cause, and there’s no single fix. The most effective approach stacks several moderate changes: cut sodium, move your body most days, practice slow breathing, sleep seven to eight hours, and lose weight if you carry excess. Each of these shaves a few points off your reading. Combined, they can rival or exceed the effect of medication.
If lifestyle changes alone don’t bring your numbers into a healthy range within a few months, or if you’re starting at Stage 2 levels (140/90 or higher), medication is a reasonable and often necessary next step. Blood pressure drugs work best alongside healthy habits, not instead of them. The goal is a sustained reading below 130/80 for most adults, and getting there is one of the most protective things you can do for your heart, brain, and kidneys over the long term.