Headache and High Blood Pressure: When to Worry, and When It's Something Else

Most people with a headache and high blood pressure on the same day assume one caused the other. Usually it didn't. High blood pressure only tends to cause a headache when it climbs very high, around 180/120 mmHg or above, and at that level the headache matters less than what else is going on in your body.

One combination of a headache and a high reading means calling 911 right now, and the section on emergencies below spells it out. The rest of the time, a headache says very little about your blood pressure.

Does high blood pressure cause headaches?

Usually not. The International Headache Society only recognizes a headache caused by high blood pressure when the top number reaches 180 mmHg or more and/or the bottom number reaches 120 mmHg or more, and it says mild (140 to 159 over 90 to 99) and moderate (160 to 179 over 100 to 109) long-term high blood pressure don't appear to cause headache.

The same classification notes that when people with mild or moderate high blood pressure wear a 24-hour monitor, there's no convincing link between their blood pressure going up and down and whether they have a headache. Harvard Health puts it simply: in almost all cases people can't feel high blood pressure, and symptoms like headache typically show up only in a hypertensive crisis of 180/120 or higher.

What does a high blood pressure headache feel like?

When very high blood pressure does cause a headache, it's often felt on both sides of the head and has a pulsing quality, and it goes away once the blood pressure comes back down, per the headache classification criteria. Cleveland Clinic adds that it may throb, slowly get worse, and last for hours or even days.

What makes it different from an ordinary tension headache is the company it keeps. The same Cleveland Clinic page lists blurry or double vision, chest pain or pressure, dizziness, palpitations, nausea or vomiting, and belly pain as symptoms that can come with it. A headache by itself, with a normal reading, is very unlikely to be a blood pressure headache.

Should I go to the ER for a headache with high blood pressure?

Yes, if your reading is 180/120 mmHg or higher and you have a headache along with chest pain, shortness of breath, palpitations, vision changes, weakness or confusion. Cleveland Clinic advises calling 911 (or your local emergency number) or going to the emergency room in that situation.

Call emergency services now if: your blood pressure is 180/120 mmHg or higher and you have any of: headache, chest pain, shortness of breath, vision changes, weakness, confusion, or trouble speaking. Don't drive yourself.

That combination is called a hypertensive emergency. Cleveland Clinic notes that the headache itself doesn't cause complications, but the emergency behind it can lead to stroke, heart attack, heart failure or a tear in the aorta. The World Health Organization gives the same instruction: very high blood pressure (usually 180/120 or higher) with symptoms like severe headache, chest pain, difficulty breathing, vision changes or confusion means seek care immediately.

What if my blood pressure is over 180/120 but I feel fine?

That's still too high, and you should contact your doctor promptly, but it's usually not a 911 situation. Doctors split very high readings into two groups based on whether organs are being damaged right now: a hypertensive emergency (organ damage present, treated in hospital with IV medication) and hypertensive urgency (no organ damage, usually treated with pills without a hospital stay).

A 2024 review from European hypertension specialists describes hypertensive urgency as usually a benign condition that more often needs an outpatient visit and treatment. In practice that means: sit quietly, recheck the reading, and call your doctor the same day if it's still that high. If any symptom from the list above shows up while you're waiting, it becomes an emergency.

What does a stroke headache feel like?

A stroke can come with a sudden, severe headache, and the NHS lists "a severe headache" among stroke symptoms alongside the main warning signs: one side of the face drooping, being unable to lift both arms, and slurred or confused speech. If you notice any of these, even if they go away, call emergency services and don't drive yourself.

The headache is the less reliable sign. The face, arm and speech changes are the ones to watch for, because they're specific.

Why do people with high blood pressure sometimes get fewer headaches?

Large population studies have found the opposite of what most people expect: higher blood pressure goes with fewer headaches. In a Norwegian study that followed adults over about 11 years, every 10 mmHg higher systolic pressure at the start was linked to 10% lower odds of developing headache later (odds ratio 0.90).

Researchers call this hypertension-associated hypalgesia, which is a long way of saying "higher pressure, less pain." The leading explanation is that the pressure sensors in your arteries, the ones that help keep blood pressure steady, also turn down pain signals in the brainstem and spinal cord. The same pattern held for pain all over the body in more than 50,000 people in the HUNT studies.

Researchers in Nepal saw the same pattern. A nationwide study there, where high blood pressure is common and often untreated, found headache was less common in people with hypertension (78.9%) than in people without it (86.6%),, though that gap was no longer statistically significant once the researchers adjusted for other factors. Their conclusion, in the paper's title: "If headache has any association with hypertension, it is negative."

High blood pressure stays dangerous whether or not your head hurts, and feeling fine tells you nothing about your numbers.

How do I get rid of a high blood pressure headache fast?

The way to get rid of it is to bring the blood pressure down. Cleveland Clinic says relieving a hypertension headache means bringing the blood pressure down, and if the reading is 180/120 or higher with symptoms, that happens in an emergency department, not at home.

Be careful with what you reach for. Cleveland Clinic lists NSAIDs like ibuprofen and naproxen, corticosteroids, stimulants and missed blood pressure pills among the triggers of a hypertensive crisis. Skip the "60-second trick" videos. If your reading is that high and you feel unwell, the trick is calling for help.

If headaches aren't a warning sign, how would I know my blood pressure is high?

You measure it. Harvard Health says high blood pressure can't be diagnosed from symptoms and the only way to know is a reading with a blood pressure cuff.

This matters because most people with high blood pressure have no idea. The WHO estimates that 1.4 billion adults aged 30 to 79 had hypertension in 2024, and about 600 million of them (44%) didn't know it. Know your numbers.

Under the 2025 ACC/AHA guideline, hypertension starts at 130/80 mmHg, the same threshold as 2017, and the overall treatment goal is below 130/80 for adults, with encouragement to get the top number under 120. Here's how those numbers line up with headache risk:

Reading (mmHg)	What it's called	Does it cause headache?
Below 130/80	Below the hypertension threshold (2025 ACC/AHA)	No
130 to 139 / 80 to 89	Stage 1 hypertension (2025 ACC/AHA)	No
140 to 159 / 90 to 99	Stage 2 hypertension; "mild" in the headache classification	Doesn't appear to
160 to 179 / 100 to 109	Stage 2 hypertension; "moderate" in the headache classification	Doesn't appear to (still debated)
180 or higher and/or 120 or higher	Severe; a hypertensive crisis	Can, and with symptoms it's an emergency

If you've never checked, a home cuff or the pharmacy machine is a fine start. The Zone Check on this site compares your blood pressure, resting heart rate, waist and A1c against optimal ranges in about two minutes.

The short version

A headache is a poor blood pressure alarm. Most headaches have nothing to do with blood pressure, and most people with high blood pressure never get one. The one time a headache and a high reading together should change what you do in the next five minutes is when the reading is 180/120 or higher and something else is off: chest pain, breathlessness, vision changes, weakness, confusion. Then call 911.

For everything else, the fix is boring and it works: measure, know your numbers, and bring them down. If you want a step-by-step plan for that, my blood pressure course walks through salt, sleep, exercise and how to work with your medications. You can also read my earlier piece on what's considered a good blood pressure and why it matters.

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About the author. Dr. Kaustubh Dabhadkar, MD, MPH, FACC is a board-certified preventive cardiologist at Novant Health Heart & Vascular Institute in Charlotte, NC. He trained at Emory University and Brown University and is a Fellow of the American College of Cardiology.

This article is for education and isn't a substitute for medical advice. If you think you're having a medical emergency, call 911 or your local emergency number.