Creator: Dr. Heo Ji-young
Published: 2026-07-25T05:01:07.000Z

An Average Does Not Know the Place

"They say my calcium is normal. And my calf cramps at night."
"The blood work is all fine, they say, and this one spot keeps hurting."

When I hear this, I take the two statements to be pointing at different things. What the test reported is the body gathered into a single value. What the patient is describing is the state of one particular place.

A Test Gathers the Body into One Value

Consider a blood test. A little blood is drawn from the arm and measured for what is in it and how much. It is a very accurate method. But the value obtained that way is the value of the blood that happened to be flowing through the vessels at that moment.

The body is divided into more compartments than that. The water inside cells, the water soaking the spaces between tissues, and the water flowing inside vessels are each a different compartment. The same holds for cells: a great many immune cells do not drift through the bloodstream but take up residence in tissue.

So a tube of blood is a sample of the body — a sample drawn from the compartment that can be reached.

A Value Being Held Steady Does Not Mean the Store Is Full

Here we go a step further.

The body holds certain substances within a narrow range. Calcium is one. Several hormones work together to keep the concentration in the blood inside a narrow band, and for good reason: if that value swings, nerve and muscle swing with it immediately.

And yet more than 99% of the body's calcium sits not in the blood but in bone. The value in the blood is closer to a service window than to the storehouse. So the number at the window being normal does not mean the storehouse is well stocked.

A value being held steady, and something being drawn down somewhere to hold it steady, are different matters.

Which Is How "Normal, and Still Unwell" Arises

Every chapter in this part sits at that spot.

Some people bruise easily while the blood work is normal. The trouble is not in the blood but in the vessels that were holding it.

Some have normal inflammatory markers while one area stays uncomfortable, because a sum gathered from the whole body does not show a low fire burning in one corner.

Swelling with no change in total body water is the same. What changed is whether that fluid sits inside the vessels or out among the tissues.

Each is a different story, and they share this: the test gathers, and the body experiences in parts.

The Test Is Not Wrong

Let me be clear about one thing. None of this says tests are inaccurate.

A test measures what it was set to measure, and does it accurately. A test of blood concentration tells you the blood concentration, and does that job very well. What it cannot do is tell you, from that one value, the state of every corner of tissue. That is not what the value was made for.

So I Look at the Value and the Place Together

In the consulting room, after looking at the number, I ask where. One side or both, always the same spot or moving about, whether pressing there feels different from elsewhere. The value tells me the state of the body as a whole; the answer tells me where the thing is happening. Only laid over each other do the two make a picture.

That said, if a number is clearly outside its range, if one side swells suddenly and hurts, or if fever comes with it — then, before weighing places, having that number and that place examined comes first.

A test gathers the body into a single value. That value is accurate, and it tells us a great deal.

But a symptom speaks of the state of one particular place, not of the body as a whole. If the report is all normal and only that spot stays different, the body is not inventing it. An average does not know the place.

An Average Does Not Know the Place

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