If your blood pressure reading is high, the first thing to do is confirm it’s accurate, then figure out where it falls on the severity scale. A single high reading doesn’t necessarily mean you have hypertension, but readings consistently at or above 130/80 mmHg put you in a category that needs attention. What you do next depends on how high the number is and whether you’re experiencing symptoms.
Understanding Your Numbers
Blood pressure is measured in two numbers: systolic (the top number, representing pressure when your heart beats) and diastolic (the bottom number, representing pressure between beats). The 2025 guidelines from the American Heart Association and American College of Cardiology define five categories:
- Normal: below 120/80 mmHg
- 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
- Hypertensive crisis: above 180/120 mmHg
If your reading lands in the “elevated” range, you’re not in immediate danger, but your blood vessels are under more stress than ideal. Stage 1 and Stage 2 hypertension both warrant a conversation with your doctor, typically after confirming the reading on multiple occasions. A reading above 180/120 is a different situation entirely.
When High Blood Pressure Is an Emergency
A reading above 180/120 mmHg is considered a hypertensive crisis. If you see that number and also have chest pain, shortness of breath, blurred vision, severe headache, confusion, nausea, or stroke symptoms like sudden numbness, trouble speaking, or difficulty walking, call 911 immediately. These signs suggest the extreme pressure is actively damaging organs.
If you get a reading above 180/120 but feel fine, wait five minutes, sit quietly, and take another reading. If it’s still that high, contact your doctor or go to an urgent care or emergency room, even without symptoms. Pressure at that level can cause damage you can’t feel.
Make Sure Your Reading Is Accurate
Before you worry about a high number, make sure the reading is reliable. Blood pressure is surprisingly sensitive to how, when, and where you measure it. The American Heart Association recommends these steps for an accurate home reading:
- Avoid caffeine, exercise, and smoking for at least 30 minutes beforehand.
- Empty your bladder before sitting down.
- Sit quietly for five minutes before taking the measurement. Don’t talk or look at your phone.
- Use an upper-arm cuff monitor, not a wrist or finger device. Place the cuff on bare skin, directly above the bend of your elbow.
- Support your arm on a flat surface at heart level. Use a pillow under your arm if needed.
- Take two readings about one minute apart and record both.
A single elevated reading at a pharmacy kiosk or after rushing to a doctor’s appointment doesn’t mean much on its own. Stress, a full bladder, or even talking during the measurement can push your numbers up by 10 to 20 points. If your reading seems high, repeat it at home under calm conditions before drawing conclusions. Track your readings morning and evening for a week or two to get a clearer picture.
What High Blood Pressure Does to Your Body
Understanding the stakes helps explain why doctors take high blood pressure seriously, even when you feel perfectly fine. When blood pushes through your arteries with too much force over months or years, it damages the inner lining of those blood vessels. That lining normally produces a molecule that keeps arteries flexible and relaxed. Hypertension disrupts this process, reducing the arteries’ ability to dilate properly.
The damage triggers inflammation, and the artery walls respond by producing more collagen and becoming stiffer. This creates a vicious cycle: stiffer arteries raise blood pressure further, and higher pressure causes more stiffening. Over time, the excess pressure gets transmitted into the tiny blood vessels of your kidneys, brain, eyes, and heart, causing organ damage that can be difficult or impossible to reverse. This is why high blood pressure is called a “silent killer.” Most people feel nothing until real damage has occurred.
What You Can Do Right Now
If your blood pressure is consistently in the elevated or Stage 1 range, lifestyle changes alone can often bring it down significantly. Even with Stage 2 hypertension, these changes remain the foundation of treatment alongside any medications your doctor prescribes.
Adjust How You Eat
The DASH eating plan, developed specifically for blood pressure management, emphasizes fruits, vegetables, whole grains, lean protein, and low-fat dairy while limiting saturated fat and added sugars. The key target is sodium: keeping intake below 2,300 milligrams per day helps, but dropping to 1,500 milligrams per day lowers blood pressure even further. For context, the average American consumes over 3,400 milligrams daily, so even modest reductions make a difference. Most excess sodium comes from restaurant meals, processed foods, and packaged snacks rather than the salt shaker on your table.
Move More
Aim for at least 150 minutes of moderate aerobic activity per week, which works out to about 30 minutes on most days. Brisk walking, cycling, swimming, or anything that raises your heart rate counts. You can also substitute 75 minutes of vigorous activity like running or interval training. Combining cardio with some form of resistance training, such as weight lifting or bodyweight exercises, appears to provide the greatest benefit for heart health.
Try Slow Breathing
This one sounds too simple to work, but the evidence is solid. Practicing slow, deep breathing for 15 minutes a day can reduce systolic blood pressure by up to 10 points in people with hypertension. A 2021 study in the Journal of the American Heart Association found that a specific technique involving 30 resisted breaths per day, six days a week, lowered systolic pressure by an average of 9 points in just six weeks. This won’t replace medication for severe hypertension, but it’s a meaningful drop that costs nothing and has no side effects.
When Medication Becomes Necessary
If lifestyle changes aren’t enough to bring your numbers into a safe range, or if your blood pressure is already at Stage 2 when first discovered, your doctor will likely recommend medication. Four main classes of blood pressure drugs are considered first-line options. Some relax blood vessels by blocking certain hormones, others help your kidneys flush out excess sodium and water, and others slow your heart rate or reduce the force of each heartbeat. Your doctor will choose based on your other health conditions, age, and how your body responds.
Most blood pressure medications take a few weeks to reach full effect, and you may need adjustments or a combination of two drugs to hit your target. Side effects vary by class but are generally mild. The most important thing to know is that these medications only work if you take them consistently. Skipping doses because you “feel fine” is one of the most common reasons blood pressure stays dangerously high.
Conditions That Cause High Blood Pressure
About 90% of high blood pressure cases develop gradually from a combination of genetics, aging, and lifestyle factors. But in some cases, an underlying condition is driving the numbers up. This is called secondary hypertension, and it’s worth considering if your blood pressure is unusually resistant to treatment, spikes suddenly, or develops at a young age.
The most common cause of secondary hypertension is obstructive sleep apnea. Narrowing of the arteries that supply the kidneys, overproduction of the hormone aldosterone, and kidney disease are also well-established causes. Thyroid problems (both overactive and underactive) can raise blood pressure as well. Certain medications contribute too: anti-inflammatory painkillers, oral contraceptives, decongestants, some antidepressants, and corticosteroids like prednisone can all push blood pressure higher. If you’re taking any of these regularly, mention it to your doctor.
Alcohol, nicotine, and some herbal supplements also raise blood pressure. If your readings are high and you consume any of these regularly, reducing or eliminating them is one of the fastest ways to see improvement.
Tracking Your Blood Pressure Over Time
A single snapshot of your blood pressure tells you very little. What matters is the pattern over days and weeks. The CDC recommends keeping a blood pressure log with morning and evening readings, each consisting of two measurements taken one to two minutes apart. Record the date, time, and both readings. This log gives your doctor far more useful information than the single reading taken in their office, which is often artificially high due to the stress of the visit itself.
Take your readings at the same time each day for consistency. After a few weeks, you’ll start to see your true average and be able to spot trends. If you’re making lifestyle changes or starting medication, this log becomes your evidence of whether those interventions are working.