The threshold and the two steps that follow it

The American Heart Association uses the term hypertensive crisis for readings this high, and its page on the subject, last reviewed August 14, 2025, separates two situations. Severe hypertension means a reading of 180/120 mm Hg or higher with no worrying symptoms. A hypertensive emergency means a reading that high together with symptoms that suggest an organ is being harmed right now.

The first step, when you feel fine, is to wait at least 1 minute and take the reading again. That 1 minute figure is current. Older American Heart Association wording said 5 minutes, and many third party health sites still repeat it. Both versions exist for the same reason: one reading is a weak basis for any decision.

The exception matters more than the rule. If you already have symptoms, skip the second reading. The heart.org page is direct about this. Do not wait to see whether the pressure comes down on its own. Call 911.

Why the second reading earns its minute

The 2025 American Heart Association and American College of Cardiology guideline treats a single reading as inadequate for clinical decisions and bases its categories on the average of two or more careful readings taken on two or more occasions. That principle does not stop applying at 180.

Blood pressure also drifts down on its own more often than people expect. Among people hospitalized with very high readings and no signs of organ damage, the guideline notes that pressure falls spontaneously, without any medicine, in 40 to 50 percent of cases. A reading taken while you are startled by the first reading is not a measurement of your usual state.

Technique explains a good share of the rest. Readings run high when the bladder is full, when you talk during the measurement, when caffeine or a cigarette came within the past 30 minutes, when the arm hangs unsupported instead of resting on a table, when the cuff goes over a sleeve, or when the cuff is too small for the arm. For the repeat reading, sit with your back supported and both feet flat on the floor, rest a bare arm on a table with the middle of the cuff level with your heart, put the bottom edge of the cuff just above the bend of your elbow, and stay quiet while the machine runs.

Do not turn this into a hunt for the perfect reading. Two careful readings a minute or more apart answer the question in front of you. If both are 180/120 mm Hg or higher, act on that.

The seven symptoms that make it a 911 call

The American Heart Association lists seven symptoms that, combined with a reading of 180/120 mm Hg or higher, mean calling 911: chest pain, shortness of breath, back pain, numbness, weakness, change in vision, and difficulty speaking.

Those seven are not a random collection. The 2025 guideline defines a hypertensive emergency as very high blood pressure along with acute damage to an organ, and its list of that damage includes sudden heart failure or fluid in the lungs, stroke or bleeding in the brain, swelling of the brain, a heart attack or unstable chest pain, sudden kidney injury, a tear in the wall of the aorta, and bleeding or swelling at the back of the eye. The seven symptoms are what that damage feels like from the inside.

1. 1 Chest pain or pressure and shortness of breath point toward the heart and the lungs.
2. 2 Sudden severe back pain, especially a tearing or ripping sensation, can come from the aorta, the large artery that carries blood out of the heart.
3. 3 Numbness or weakness, particularly on one side of the body, points toward the brain.
4. 4 Difficulty speaking, including slurred words or trouble finding them, also points toward the brain.
5. 5 A change in vision, such as sudden blurring, double vision, or loss of sight in one or both eyes, can come from the brain or from the eye itself.

Notice what is absent from that list: headache. The American Heart Association does not name headache among the symptoms that trigger a 911 call at this threshold. A sudden severe headache with no known cause is a stroke warning sign, and that is an emergency on its own terms. But an ordinary headache is not a reliable signal that your pressure is high. For most people, the American Heart Association says plainly, high blood pressure produces no signs or symptoms at all.

Stroke and heart attack signs stand on their own

If stroke or heart attack signs appear, the blood pressure number stops mattering. Call 911 first. A monitor cannot tell you whether you are having a stroke, and the minutes you spend checking are the minutes that count most.

The American Stroke Association, the American Heart Association, and the Centers for Disease Control and Prevention all now use the same memory aid, B.E. F.A.S.T.

1. 1 B stands for balance. A sudden loss of balance or coordination.
2. 2 E stands for eyes. Sudden changes in vision.
3. 3 F stands for face drooping. Ask the person to smile and watch whether one side droops or feels numb.
4. 4 A stands for arm weakness. Ask them to raise both arms and watch whether one drifts down.
5. 5 S stands for speech difficulty. Speech that is slurred or hard to understand.
6. 6 T stands for time to call 911.

Two instructions attached to that list are easy to forget under stress. Call 911 even if the symptoms go away, because a stroke that clears is still a warning worth an ambulance. And check the time the first symptom appeared, because treatment choices depend on it. The CDC adds a third: do not drive to the hospital, and do not let someone else drive you, so that medical personnel can start treatment on the way.

Heart attack signs deserve the same treatment. The American Heart Association describes the most common one as discomfort in the center of the chest that lasts more than a few minutes or goes away and comes back, felt as uncomfortable pressure, squeezing, fullness, or pain. Other signs include discomfort in one or both arms, the back, neck, jaw, or stomach, shortness of breath with or without chest discomfort, a cold sweat, nausea, lightheadedness, a rapid or irregular heartbeat, and unusual tiredness. Women may notice anxiety, shortness of breath, nausea, vomiting, an upset stomach, shoulder, back, or arm pain, and unusual weakness. Calling 911 is almost always the fastest route to treatment, because an emergency medical services team can begin care when they arrive rather than when you reach a waiting room.

What "severe hypertension" means now, and what it does not

If you looked this up a few years ago, you may have met the phrase hypertensive urgency for a very high reading without symptoms. That term has been retired. Current guidance calls the same situation severe hypertension, and the change carries a practical message.

In its summary of the 2025 guideline, the American Heart Association states that severe hypertension in nonpregnant adults, defined as blood pressure of 180/120 mm Hg or higher without evidence of acute organ damage, should be evaluated and treated in the outpatient setting by starting, restarting, or intensifying oral blood pressure medicines in a timely manner.

Two things follow from that sentence. A very high reading without symptoms usually does not require a hospital visit, and it does require a prompt call. The guideline also advises against aggressive short term lowering when no organ damage is present. Pressure that falls too fast can reduce blood flow to the brain, heart, and kidneys, which is why the plan is a considered adjustment rather than a race to bring the number down tonight.

That is also why the answer to "should I take something extra" is a question for your care team, not a decision to make at the kitchen table. Medicine changes, including what to do about a dose you missed, belong to the health care professional or pharmacist who knows your full list. Ask in advance and write the answer next to your medicines so it is there when you need it.

Making the call when you have no symptoms

"As soon as possible" in practice means the same day. Suppose your monitor reads 186/122 on a Tuesday evening, you wait a couple of minutes, take a careful second reading, and get 182/118. You feel completely normal. That is a call to your care team, not a drive to the emergency department.

During office hours, call the practice directly. After hours, your call may be routed to a health care professional on call or to a nurse advice line, and some health plans run advice lines of their own. A nurse line will typically ask about the readings, your symptoms, and your medicines, and will then tell you whether to recheck, come in, or go to the emergency department.

Have the details ready before you dial: both readings and the times you took them, how they compare with your usual home average, how you took them, whether you have any symptoms at all, your current medicines and any doses you missed this week, and anything new in the past week such as a new prescription, a decongestant, a nonprescription pain reliever, alcohol, illness, pain, or a badly broken night of sleep. A separate article in this series covers how to explain a concerning reading when you call.

If you cannot reach anyone and the reading stays this high, judge by symptoms. MedlinePlus advises calling your health care professional's office when you are unsure and none of the serious emergency signs are present. The signs that change the answer to an emergency department visit include severe chest pain or pressure, severe shortness of breath, suddenly being unable to speak, see, walk, or move, sudden weakness or drooping on one side, passing out, an unusual or bad headache that started suddenly, dizziness or weakness that does not go away, and sudden confusion.

When the usual numbers do not apply to you

The 180/120 mm Hg definition in the guideline is written for nonpregnant adults. Blood pressure thresholds in pregnancy are different and lower. Anyone who is pregnant or recently pregnant should use the numbers their obstetric care team gives them and call promptly about a high reading, a headache, a vision change, or pain in the upper abdomen. Eclampsia, a pregnancy related complication involving seizures, appears on the American Heart Association's list of what a hypertensive crisis can lead to.

Some people are given a different number to act on for other reasons, such as kidney disease, heart failure, or a recent stroke. If your care team has set a personal threshold for calling, ask them to write it down along with the number to use after hours, and keep it with your monitor rather than in your memory.

Write the plan down before you need it

At the moment a monitor shows 190/124 mm Hg, nobody reads carefully. Tape three lines to the back of the monitor or inside the medicine cabinet. First: 180/120 or higher with chest pain, shortness of breath, back pain, numbness, weakness, vision change, or trouble speaking means call 911. Second: 180/120 or higher with none of those means wait at least 1 minute, recheck, then call this number. Third: stroke or heart attack signs mean call 911 immediately, note the time, and do not drive.

Then leave the monitor alone between checks. Most days, high blood pressure causes nothing you can feel, which is exactly why the plan is worth writing while you feel fine.