Blood Pressure Rises for a Reason
The short answer
When you are told your blood pressure is high, the conversation usually turns straight to what to cut back on. But there is a question to ask before that — why did the body raise the pressure in the first place? Blood pressure is the pressure that keeps the roads open so blood can reach where it needs to go, and when the reason to raise it stays in place, the body keeps it raised for as long as that reason remains. This is not a reason to stop blood pressure medication on your own — looking at the reason does not compete with the medication.
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When you are told your blood pressure is high, the conversation usually goes straight to what to cut back on. Salt, weight, alcohol, tobacco.
All of that is correct. But there is something worth asking before it.
Why did the body raise the pressure?
Blood Pressure Is the Pressure That Keeps the Roads Open
The most fundamental question in the body is whether blood actually reaches where it needs to go.
Think of it as a country's road network. The roads have to stay connected so that rescue teams can be sent when an earthquake strikes, medical staff when disease spreads, and supplies when floods come. If the roads are cut, it does not matter what is sitting in the warehouse.
In the body, the pressure that keeps those roads open is blood pressure.
And there is no place blood does not need to reach. Wherever more is needed, more must reliably be delivered. So judgment is involved here. The nervous system is what does the judging in the body, which is why blood pressure is tied to the autonomic nervous system.
When There Is a Reason to Send More, the Body Raises the Pressure
A few of these are written plainly in the textbooks.
When blood flow to the kidneys drops, the kidneys respond immediately: they narrow blood vessels, hold on to more salt and water, and activate the sympathetic nervous system further. To make up a shortage in one place, the body raises pressure throughout the whole system.
The same happens when you stand up from sitting. The brain sits above the heart, so the moment you stand, blood has to be pushed up against gravity. The body raises pressure every time this happens.
It is the same when you are in pain, cold, or startled. When stress arrives, blood pressure and blood sugar rise together and the pulse quickens. It is never just the one thing that rises.
From Here, It Is a Different Story
Everything so far has been moment-to-moment adjustment. It rises when you stand, and falls when you sit back down. This is not disease — it is something the body does all the time.
Pressure that stays high across many measurements over many days is a different story. It has its own diagnosis and its own treatment. The earlier examples do not turn directly into this disease.
In between, there is this point: when the circumstance requiring a raised pressure stays in place for a long time, the body keeps the pressure raised for just as long.
Circumstances That Linger
In people whose breathing is shallow and whose chest feels tight, high blood pressure sometimes travels alongside it. When the inside of the chest is under pressure, it becomes harder for the heart to send blood up to the brain. In such cases, I take it that the body raises pressure in advance to compensate. This much is my own reasoning, following the mechanism.
And one more — if blood pressure is high, bowel habits are worth checking too, and if constipation has gone on for a long time, blood pressure is worth checking too.
The muscle that moves the intestines and the muscle that tightens blood vessels are both smooth muscle. So when I look at one, I look at the other alongside it. The two do not always appear together. But they are worth checking together.
Looking at blood pressure alone, none of this becomes visible.
What It Means to Say There Is a Reason
Saying there is a reason does not mean the pressure need not be lowered.
Even if the body raised the pressure for a reason, the parts that bear that pressure over time are the blood vessels, kidneys, heart, and eyes. Damage accumulates there even while there are no symptoms at all.
And blood pressure raised because of another disease can sometimes come down once that disease is treated, but hypertension with no separate identifiable cause (essential hypertension) has no known cure yet, so most people continue on medication.
This is not a reason to stop blood pressure medication on your own. Medication is something to maintain in consultation with the doctor who prescribed it. Looking at the reason does not compete with that.
The Reason Does Not Disappear on Its Own
Medication lowers the pressure. But the circumstances alongside it do not automatically change too. If sleep is short, it stays short; if the chest is under pressure, it stays under pressure; if tension has not eased for years, it stays that way.
How much of a share these circumstances have in blood pressure differs from person to person. But as long as they remain, the body keeps pulling in that direction. This is a continuation of what I discussed in why the body still feels heavy even while on blood pressure medication.
A rise in blood pressure is, more often than not, the result of the body trying to protect something.
When the thing being protected goes on long enough, it becomes a disease. That does not mean the reason for protecting it disappears. Bringing the number down and reducing the reason behind it go together.
Written by Dr. Heo Ji-young (PhD in Korean Medicine Pathology, Kyung Hee University · former Research Professor of Herbology, Kyung Hee University)
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