If your blood pressure reading is above 180/120, and you have symptoms like chest pain, shortness of breath, blurred vision, or confusion, call 911. That combination is a hypertensive crisis and a medical emergency. If your reading is high but you feel fine, the steps below can help you respond calmly and accurately.
First, Check Whether Your Reading Is Accurate
A single high reading on a home monitor doesn’t always reflect your true blood pressure. Rushed measurements, a full bladder, or even talking during the reading can inflate your numbers significantly. Before you panic, retake the measurement using the CDC’s recommended protocol:
- Sit quietly for 5 minutes in a chair with your back supported before measuring.
- Keep both feet flat on the floor, legs uncrossed.
- Position your arm on a table at chest height with the cuff against bare skin.
- Don’t talk while the monitor is running.
- Avoid food, drinks, and caffeine for 30 minutes beforehand.
- Empty your bladder before sitting down.
Take two or three readings about a minute apart and average them. If the numbers come down after you sit properly and rest, your first reading was likely inflated by posture, stress, or technique. If they remain elevated, continue with the steps below.
Know Your Blood Pressure Category
The 2025 guidelines from the American Heart Association and American College of Cardiology define five categories. Knowing where your reading falls helps you decide how urgently to act.
- Normal: below 120/80
- Elevated: 120 to 129 systolic with diastolic still under 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
A reading in the stage 1 or stage 2 range is worth addressing, but it’s not the same as a crisis. These numbers call for lifestyle changes and a conversation with a healthcare provider, not a trip to the emergency room.
What to Do Right Now During a Spike
If your reading is high but below 180/120 and you have no alarming symptoms, the most effective immediate step is simple: sit down, get comfortable, and rest. Moving around, standing, and stress all push blood pressure upward. Sitting quietly with your back supported for even five minutes allows your cardiovascular system to settle. Lying flat is fine too, though some people find that sitting slightly upright feels more comfortable.
Slow, controlled breathing is one of the few interventions that can produce a noticeable drop in the moment. Aim for six to ten breaths per minute, breathing in slowly through your nose, then exhaling for longer than you inhaled. This pace activates your body’s “rest and digest” nervous system response, which widens blood vessels and slows your heart rate. Even five to ten minutes of this can help. Research from Harvard Health shows that a daily practice of about 15 minutes of slow breathing contributes to measurably lower blood pressure over time, and a study in the Journal of the American Heart Association found that a specific type of breathing exercise reduced the top number by an average of nine points within six weeks of daily practice.
If anxiety or stress triggered the spike, anything that calms your nervous system will help. Step away from whatever is stressful. Put your phone down. Close your eyes. Listen to something calming. The goal is to interrupt the flood of stress hormones that constrict your blood vessels.
What Not to Do
The instinct to “fix it fast” can actually be dangerous. Dropping blood pressure too quickly, especially if you’ve had chronically high readings for months or years, carries real risks. Your brain adjusts its blood flow regulation to match your usual blood pressure over time. When pressure falls suddenly, blood flow to the brain can drop enough to cause dizziness, confusion, or in rare cases, a stroke-like event. A study in The American Journal of Emergency Medicine found that rapid blood pressure lowering reduced blood flow velocity in the brain by about 9%, and roughly 5% of patients in the study experienced a reversible neurological event.
This means you should not take extra doses of blood pressure medication that weren’t prescribed for this situation. Don’t borrow someone else’s medication. Don’t take multiple home remedies at once hoping to stack their effects. A gradual return to normal is safer than a sudden plunge.
Skip the Glass of Water Myth
You may have seen advice to drink water to lower blood pressure quickly. The evidence suggests the opposite. Research published in the AHA journal Circulation found that drinking about two cups of water actually raised systolic blood pressure by around 11 points in older adults within 30 minutes. In younger, healthy adults, there was no significant change. The mechanism involves water triggering a spike in sympathetic nervous system activity, the same system that raises blood pressure during stress. So while staying hydrated throughout the day is a reasonable health habit, chugging water during a blood pressure spike is unlikely to help and could nudge your numbers higher.
When a High Reading Is an Emergency
A reading above 180/120 puts you in hypertensive crisis territory. If you see that number and feel fine, sit down, wait five minutes, and recheck. Sometimes a single reading is a fluke. If it stays above 180/120, contact your healthcare provider promptly for guidance.
If it stays above 180/120 and you experience any of these symptoms, call 911 immediately:
- Chest pain or pressure
- Shortness of breath
- Severe headache unlike any you’ve had before
- Blurred vision or vision changes
- Confusion or difficulty speaking
- Nausea or vomiting
- Seizures
These symptoms suggest that the high pressure is actively damaging organs like your heart, brain, or kidneys. In the emergency department, doctors use carefully controlled medications to bring pressure down gradually, typically aiming to lower it by no more than 25% in the first hour to avoid the risks of too-rapid reduction.
After the Spike Passes
Once your numbers come back down, write down what happened: the readings, the time of day, what you were doing beforehand, and any symptoms. This information is genuinely useful for your healthcare provider. A single spike doesn’t necessarily mean your treatment plan needs to change, but a pattern of spikes does.
If you’re already on blood pressure medication, check whether you missed a dose. Skipped doses are one of the most common triggers for sudden spikes. If you’re not on medication and you’re seeing stage 2 numbers (140/90 or higher) repeatedly at home, that pattern is worth discussing with a provider sooner rather than later. Persistent high blood pressure causes damage silently over months and years, so addressing it early gives you the most options and the best outcomes.