If your blood pressure reading is high, the first thing to do is stay calm and figure out how high it actually is. A reading below 180/120 is not an immediate emergency, but it does need attention. A reading at or above 180/120 is a hypertensive crisis and requires emergency medical care, especially if you have symptoms like chest pain, blurred vision, severe headache, or confusion.
What you do next depends on your numbers, whether this is a one-time reading or a pattern, and whether you’re already on treatment. Here’s how to sort through it.
Check If It’s a True Emergency
A blood pressure of 180/120 or higher is considered a hypertensive crisis. At this level, the force on your artery walls can damage organs, trigger a stroke, or cause a heart attack. If your reading hits these numbers and you’re experiencing any of the following, call emergency services immediately:
- Chest pain
- Severe headache
- Blurred vision
- Confusion or unresponsiveness
- Nausea and vomiting
- Seizures
- Shortness of breath
If your reading is 180/120 or higher but you feel fine, wait five minutes and measure again. If it’s still that high, contact your doctor or go to urgent care. Don’t assume it’s nothing just because you feel normal.
Make Sure Your Reading Is Accurate
A surprisingly large number of high readings are simply measurement errors or temporary spikes. Before you worry, take the reading again under proper conditions. The CDC recommends a specific protocol: sit in a chair with your back supported for at least five minutes before measuring. Put both feet flat on the floor, legs uncrossed. Rest your arm on a table at chest height. Place the cuff on bare skin, not over clothing. Don’t talk during the measurement.
Also avoid eating, drinking, or using caffeine for 30 minutes beforehand, and empty your bladder first. A full bladder alone can add 10 to 15 points to your reading. If your first reading was taken after rushing into a clinic, climbing stairs, or while anxious, the number may not reflect your actual baseline.
Between 15% and 30% of people who show elevated readings in a doctor’s office actually have normal blood pressure the rest of the time. This is called white coat hypertension. If your readings are consistently high at the doctor but normal at home, mention this. Your doctor may recommend 24-hour ambulatory monitoring, where you wear a portable cuff that takes readings throughout the day, to get a clearer picture.
Know What Your Numbers Mean
Blood pressure is measured in two numbers. The top number (systolic) reflects pressure when your heart beats. The bottom number (diastolic) reflects pressure between beats. The American Heart Association classifies readings into four categories:
- Normal: below 120/80
- Elevated: 120 to 129 systolic, with diastolic 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
A single high reading doesn’t mean you have hypertension. Diagnosis typically requires elevated readings on at least two or three separate occasions. But if you’re consistently in Stage 1 or Stage 2 territory, it’s time to act.
What to Do Right Now to Bring It Down
If your blood pressure is high but not in crisis range, there are a few things you can do in the short term. Slow, deep breathing is one of the most effective immediate tools. It stimulates the vagus nerve, which activates your body’s “rest and digest” response, lowering your heart rate and widening blood vessels. Try extending your exhale so it’s longer than your inhale. Breathing out slowly takes advantage of a natural reflex that counters blood pressure spikes.
Practiced regularly (about 15 minutes a day), deep breathing can reduce systolic pressure by up to 10 points. That’s a meaningful drop, roughly equivalent to what some medications achieve.
Beyond breathing, consider what might have triggered the spike. Caffeine can raise blood pressure by 5 to 10 points, particularly if you don’t drink it regularly. Stress, poor sleep, pain, and dehydration are all common short-term causes. If you can identify and address the trigger, your numbers may come down on their own.
Dietary Changes That Make a Real Difference
Sodium is the single biggest dietary factor in blood pressure. Your body holds onto extra water to dilute excess sodium, which increases blood volume and puts more pressure on artery walls. The general target is no more than 2,300 milligrams of sodium per day, but dropping to 1,500 milligrams produces an even larger reduction. For context, one teaspoon of table salt contains about 2,300 milligrams, and most people consume well over that through processed and restaurant foods.
The DASH eating plan, developed by the National Heart, Lung, and Blood Institute specifically for blood pressure management, emphasizes fruits, vegetables, whole grains, lean proteins, and low-fat dairy while limiting saturated fat and sodium. It’s not a fad diet. It’s one of the most studied dietary patterns in medicine, and it reliably lowers blood pressure within weeks.
Potassium works as a natural counterbalance to sodium. It helps your kidneys flush out excess sodium and eases tension in blood vessel walls. The World Health Organization recommends at least 3,510 milligrams of potassium daily for adults. Good sources include bananas, potatoes, spinach, beans, and avocados. Getting potassium from food is safer and more effective than supplements for most people.
Lifestyle Habits That Lower Blood Pressure Long-Term
Regular physical activity strengthens your heart so it pumps blood with less effort, directly reducing the pressure on your arteries. Aim for at least 150 minutes a week of moderate activity like brisk walking, cycling, or swimming. The effects are measurable within a few weeks and comparable to adding a medication.
Excess body weight is a major driver of hypertension. Even a modest weight loss of 5 to 10 pounds can produce a noticeable drop in blood pressure. You don’t need to hit an ideal weight to see benefits.
Alcohol raises blood pressure both in the short term and over time with regular use. If you drink, keeping it moderate (one drink per day for women, two for men) limits the effect. Cutting back further, or stopping entirely, often produces a measurable improvement. Chronic stress also plays a role, though its impact is harder to quantify. Finding consistent ways to manage stress, whether through exercise, breathing practices, or simply better sleep, supports lower readings over time.
When Medication Becomes Necessary
Lifestyle changes are the first line of treatment for elevated and Stage 1 hypertension, but they’re not always enough. If your blood pressure stays in Stage 2 territory despite consistent lifestyle efforts, or if you have additional risk factors like diabetes or a history of heart disease, medication is typically the next step.
The most commonly prescribed blood pressure medications work through a few different mechanisms. Some relax and widen your blood vessels by reducing a chemical called angiotensin that causes arteries to constrict. Others slow your heart rate so each beat produces less force. A third type prevents calcium from tightening the muscles in your artery walls, keeping vessels open and relaxed. Some of these can also slow the heart rate for a combined effect.
Most people start on one medication and adjust from there. It’s common to try more than one type before finding the right fit, since side effects vary from person to person. Blood pressure medication works only while you’re taking it, so stopping without your doctor’s guidance will cause your numbers to climb back up. Many people take these medications long-term without issues.
Track Your Numbers at Home
A home blood pressure monitor is one of the most useful tools you can buy. It costs between $30 and $60 for an upper-arm cuff model (which is more accurate than wrist monitors) and lets you track trends over time rather than relying on occasional office visits. Take readings at the same time each day, ideally morning and evening, using the proper technique described above. Record the numbers so you can share them with your doctor.
Home monitoring helps you see which habits actually move the needle. It also catches patterns that office visits miss, like blood pressure that spikes in the morning or rises after certain meals. Over time, this data gives both you and your doctor a much clearer picture than a handful of clinic readings ever could.