Tired from too much, or tired from too little

“Why am I always tired even when I sleep enough?”

That is the question, more or less word for word, that people type. The answers that come back are reasonable. Check iron, thyroid, vitamin D. Look at sleep quality, not only hours. Consider stress, alcohol, screens. All worth doing, and a blood test should come before any article, including this one.

What those answers share is an assumption that tired is one thing with a list of possible causes. In Sasang medicine it is at least two things, and they point in opposite directions. Handle one as if it were the other and you can make it worse.

The heavy kind

The first kind belongs, in the classical picture, to the Taeeumin: the liver-dominant, lung-deficient type.

If you read the earlier piece on the five phases, this is the type assigned to metal, the gathering direction. Energy draws in and holds. It settles and sinks. That is a strength in plenty of ways; the Taeeumin tends to have stamina and reserves. The problem is the other side of the same tendency. What comes in does not leave easily.

So the tiredness has a particular texture. Heavy, rather than empty. Foggy. Worse after sitting still for a long time, often worse after a big meal, and the part people find counterintuitive: frequently better after moving. A walk that you did not want to take can leave you with more energy than you had before it, because what was stuck got moving.

The way I usually put it: waste accumulates and circulation does not keep up.

The empty kind

The second kind belongs to the Soeumin: kidney-dominant, spleen-deficient.

Here the spleen and stomach, the system that in classical terms turns food into usable energy, is the smaller side of the balance. The tiredness is not a blockage. It is a shortfall. Not enough is being made in the first place.

The texture is different. Drained rather than heavy. Worse after skipping a meal, worse in the cold, worse after exertion that someone else would shrug off. A small appetite, or a stomach that protests at slightly more than usual. Rest helps. Regular, warm food helps. Pushing through, the thing that works for the heavy kind, tends to take more out than it puts back.

A 2013 study in the Korean journal of Sasang medicine is the closest thing I know of to a test of this, and it is worth going through carefully, because the honest version is less tidy than the headline.

Sixty-three people were sorted into a fatigued group and a non-fatigued group, then given a battery of questionnaires and physiological measurements. Across the whole sample the fatigued group scored worse on digestive symptoms, pain, sleep and quality of life, all statistically significant. The abstract then says that Soeumin had the more serious digestive problems and Soyangin the more serious sleep disturbance.

That line is the one that gets quoted. The tables underneath it do not quite support it. Within the Soeumin participants the digestive score was 3.93 in the fatigued group against 1.44 in the non-fatigued, which is the expected direction, but the comparison came out at p = 0.096, and the paper’s own results section says plainly that none of the per-constitution differences reached significance. There were 14 fatigued Soeumin and 9 non-fatigued. That is not enough people to show much.

So: the direction matches the classical description, the whole-sample link between fatigue and digestion is solid, and the constitution-specific claim is suggestive and underpowered. I would rather give you that than the abstract’s version.

Why the usual advice splits them

Put the two side by side and the generic fatigue advice starts to look like a coin toss.

“Exercise more” is good advice for the heavy kind and can be the wrong advice for the empty kind, at least until the eating side is in order. “Eat lighter, try fasting” might clear some fog for the first and leave the second running on nothing. “Rest more” suits the second and can deepen the sluggishness of the first.

None of that makes the advice wrong. It makes it incomplete, because it was written for a reader with no particular direction.

Tiredness as a signal

There is one more reason this distinction matters, and it goes past the complaint itself.

In clinical Sasang practice, fatigue is not only something to fix. It is one of the main ways a practitioner judges whether a remedy suits a person at all. Not whether the headache or the skin or the joint improved. Whether the person feels less tired, whether bowels and urine are regular, and how they sleep. Those three are read before the chief complaint, because the chief complaint can improve for all kinds of reasons while the body is quietly being pushed the wrong way.

I take that ordering from Ahn Jun-cheol’s clinical lectures, where it is put about as bluntly as I have put it here.

Patients, understandably, watch the thing they came in for. The practitioner is watching how tired they are.

The sauna and the mountain

Two things I see often enough that I bring them up without being asked.

Taeeumin patients tell me about colds in a way other patients do not. They went up a mountain while they had one. Fresh air, a long walk, actual exertion with a cold already underway, which is the opposite of what anyone would advise. And they come back saying their head cleared and the cold went. I have heard that from a lot of Taeeumin patients. Not one or two.

The other one is the sauna, which in Korea is not a luxury so much as a way people look after themselves. Sweat it out, feel better. Soeumin patients tend not to feel better. They come out of it heavier than they went in, and tired for the rest of the day, and some of them have half-decided that something is wrong with them because the thing that is supposed to be restorative leaves them flattened.

Nothing is wrong with them. It is the same difference the rest of this article is about. The mountain moves something for the type that is clogged. The sauna takes something out of the type that is already running short.

Three questions for this week

These will not tell you your constitution. A practitioner would settle that from face, build, history and pulse together. What they can tell you is which kind of tired you are dealing with right now.

After a walk you did not feel like taking, did you come back with more energy or less?

After a skipped or late meal, does the tiredness sharpen, or does your head clear?

After a long, heavy dinner, are you sluggish and foggy, or do you feel, for once, properly fuelled?

If your answers lean one way across all three, that is worth bringing to whoever you see about it. And if the fatigue is new, severe, or comes with weight loss, breathlessness or low mood, see a doctor first. Those are not questions for an article.