The Two Ways of Overthinking: Yi, the Spirit of the Spleen

“When the Heart applies its attention, that is the Yi.” — Lingshu, chapter 8

This line is the second link in the chain we quoted in full in the first article of this series, devoted to the Shen, the spirit of the Heart: each spirit is born there from the one before, and each article in the series opens on its own line. After consciousness, here is thought.

Of the five spirits of Chinese medicine, the Yi 意 is the least spectacular. It doesn’t dream like the Hun, doesn’t stand up to fate like the Zhi. It practises its scales: reading, retaining, sorting, concluding. Yet it’s the one our lives call upon most (emails, open tabs, one decision after another) and the one that wears out most quietly.

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The series of the five spirits

This article is part of a five-part series on the visceral spirits (wu shen) of Chinese medicine, one per organ:

Digesting a meal, digesting a thought

The Chinese Spleen (Pí 脾) doesn’t correspond to the anatomical spleen of modern treatises. It designates a functional whole: transforming food (the tradition says yun hua, “to transport and transform”), drawing from it the acquired Qi that renews the day’s available energy, then distributing what nourishes.

Chinese Spleen, anatomical spleen: what you feel on your left side. The Spleen this article speaks of is a function in the Chinese model: transforming food, distributing what nourishes, sustaining thought. It’s not the organ tucked under your ribs, on the left. Pain in the left flank or under the left ribs therefore can’t be “read” through this lens: it calls for a medical examination. If pain there is marked, new or persistent, see a physician first: Info-Santé at 811, or 911 if it is intense and sudden. Acupuncture, here as everywhere, is added to medical care; it does not replace it.

The Yi performs the same operation in the mental register. It receives a piece of information, holds it in attention, sorts it, makes it assimilable. Concentration, study, working memory, forming a practical intention: everything that turns the raw into the usable. (The memory at issue here is the memory of study, taking in and giving back; the memory of a life belongs to another register, which the tradition entrusts to the Kidney.) The analogy is structural, one of the great devices of Chinese medical thought: the same move, read at two scales.

The character for Yi rewards a pause: 意 superimposes 音, sound, and 心, heart. The sound of the heart. Thought is described here as an inner speech: that voice which comments, tidies, repeats in order to retain. When the Yi is well, this voice concludes and then falls silent. Rumination is precisely the inner speech that no longer switches off.

Healthy thinking is recognized by a criterion we almost always forget: its capacity to stop. To follow a line of reasoning through to its conclusion, then move on to something else.

One last trait sets the Yi apart: its cost. Thinking consumes the Qi of the Spleen, and a weakened Spleen thinks poorly. No other spirit displays so blunt a link between metabolism and cognition: you think with your dinner as much as with your ideas. The internal arts have kept the other side of this proximity: “the Yi leads the Qi,” say the taiji treatises, where intention directs movement before the muscle does.

Ruminating or daydreaming: two excesses that don’t resemble each other

“Overthinking” covers experiences that are almost opposites.

The rumination of the Yi stays attached to words and problems. It picks the same conversation back up, the same invoice, the same decision. The sentences turn, no new element appears, nothing concludes.

The reverie of the Hun, the spirit of the Liver, works otherwise: it produces images, scenarios, branchings. It travels, sometimes without order or anchor. We’ll come back to it in the last article of the series.

The same person can know both. But the distinction matters, because a thought imprisoned by a problem and an imagination scattering itself belong neither to the same mechanism nor, within the Chinese framework, to the same approach.

The thought that knots the Qi

Reflecting demands that the mind concentrate: suspending the other possibilities, going back over certain elements, holding a tension in place. The Suwen devotes its chapter 39 to the movements each emotion impresses upon the Qi (“the hundred illnesses are born of the Qi”) and reserves a concise formula for thought: sī zé qì jié 思则气结, thought knots the Qi.

This knotting is normal. Without it, no sustained study, no complex reasoning. It becomes pathological when it no longer comes undone.

After the end of a term, weeks of filings and reports, or months of worry over a loved one, some people describe a “closed” stomach, a tight belly, an irregular appetite, and the impression that the brain keeps working at night without producing anything at all. Nothing flows through to a decision. The problem isn’t having reflected: it’s no longer being able to get out of the reflection.

Thought (Sī 思) figures, for that matter, among the seven emotions of Chinese medicine, not as a feeling, but as a normal movement of Qi that makes people ill through excess, through duration, or because it can no longer come undone.

When thought exhausts itself: four classical patterns

The first article sorted the states of the Shen: under-nourished, agitated, obstructed, unanchored. The same logic, seen from the Spleen, yields four patterns the tradition distinguishes carefully, because they aren’t worked with in the same way.

Spleen Qi deficiency: a thought that lacks strength

Here the complaint is less about worry than about diminishing returns. You start reading, attention comes unhooked, you begin the same paragraph again. A simple task demands a disproportionate effort. The fog thickens after meals. Decisions wait.

And since reasoning no longer arrives anywhere, the same preoccupations keep coming back. You worry about modest things, not because they’re threatening, but because you can no longer organize them and bring them to a close. In the traditional framework, rumination is here as much a consequence of exhaustion as a cause: thought turns because it lacks the strength to conclude.

The acupuncturist will look for the rest of the picture: poor appetite, loose stools, heaviness, and that pale tongue which keeps the imprint of the teeth along its edges. The body confirms the story the head is telling.

Heart and Spleen deficiency: the circle of intellectual overwork

The portrait that comes back to me most often in consultation looks like this: someone at the end of a term or of a contract, who sleeps their seven or eight hours and wakes as tired as the night before. They reread the same page three times, write everything down because nothing stays, leave half their plate. Worry doesn’t dominate the picture; what stands out is the fatigue of the very act of thinking. (Impressions composed over many encounters, never the portrait of one person.)

The mechanism can be described in a few steps. Worries and prolonged mental work weaken the Spleen. It produces less Qi and Blood. The Heart, whose Shen needs Blood to remain stable, finds itself less well nourished. The person becomes more anxious, more sensitive, less able to recover, and this anxiety relaunches the thoughts. The circle closes.

Sleep is present, but no longer restores. Immediate memory declines. Appetite fades. Palpitations sometimes occur at rest. Some people weep less from sadness than from exhaustion: the slightest request becomes one too many.

The tradition gave this picture a name, xīn pí liǎng xū 心脾两虚, the simultaneous deficiency of Heart and Spleen, and devoted a famous formula to it, Gui Pi Tang, the “decoction that restores the Spleen.” Teachers have made it the syndrome of students and caregivers: those who kept going long after fatigue appeared.

This portrait corrects a widespread reflex: a low mood doesn’t always mean that an emotion is blocked and would need to be “released.” In this picture, there’s nothing to unknot. The resources are missing. It’s an empty tank, not a closed door.

Dampness and Phlegm: bogged-down thought

This time, the mental fatigue has a texture. The head feels heavy, tight as if wrapped in a band. Ideas advance slowly, as though through a thick substance. After the meal, a marked drowsiness sets in. The person isn’t necessarily anxious; they become passive, unreactive, gently indifferent.

This calm is deceptive: thought here is veiled rather than soothed.

Chinese medicine describes this loss of sharpness through Dampness and Phlegm: what the Spleen should have transformed and distributed accumulates, and the “clear” rises less well towards the head. This is the register of obstruction, already met in the first article: not a lamp short of oil, but a fogged pane in front of the flame.

The Liver invades the Spleen: irritated rumination

You receive an upsetting message. Appetite disappears, the belly bloats almost at once. All through the meal, you reconstruct the conversation, prepare replies, go back over what should have been said.

That rumination is neither soft nor foggy. It’s tense.

In the logic of the five elements, the Liver belongs to Wood, the Spleen to Earth, and Wood normally regulates Earth (mù kè tǔ 木克土). When the Liver’s movement is blocked (vexations, frustrations, a sense of injustice), this control becomes excessive: the upset disturbs digestion, and the digestive discomfort feeds the irritation.

The content of the thoughts often gives the clue. Spleen deficiency worries about everything, without hierarchy; invasion by the Liver chews over what irritates, constrains or seems unjust, and the mood varies with the events of the day.

The Spleen at the centre: the Yi among the five spirits

The five spirits form less a list than a loop, whose full figure is given in the article on the Hun; fine clinical work lies in spotting where it breaks. Four relationships place the Yi within this whole: it’s the cycle of the five elements applied to the psyche.

The Heart nourishes the Spleen

Fire nourishes Earth: the Heart lends the Yi the conscious presence that orients attention; that’s the meaning of the Lingshu line placed at the opening. In return, the Spleen produces part of the Blood that houses the Shen. The texts call this axis the nutrition of the spirit; its exhaustion produces the Heart and Spleen deficiency described above, where thought and consciousness weaken together.

The Spleen nourishes the Lung

Earth nourishes Metal: what the Spleen extracts from food, the Lung mixes with the breath and distributes. Their pathological relationship fits in a textbook formula: the Spleen makes the Phlegm, the Lung receives it. This passage from digestion towards the breath will open the next article, devoted to the Po, the corporeal spirit of the Lung.

The Liver controls the Spleen

Wood controls Earth: the Liver’s movement gives a direction to digestion as to reflection. In excess, this control becomes the invasion of the fourth pattern. The Suwen’s theory of counter-emotions draws an unexpected consequence from it: anger overcomes thought (nù shèng sī 怒胜思). The physicians of the Jin and Yuan, Zhang Congzheng foremost among them, report cures in which a patient’s anger was deliberately provoked to break an established rumination: a vertical jolt that unknots what thought had contracted. A historical anecdote rather than a method to imitate, but it says much about the coherence of the system: each movement of Qi can undo another.

The Spleen controls the Kidney

Earth contains Water, and the same theory holds that reflection overcomes fear (sī shèng kǒng 思胜恐): naming a danger, measuring its dimensions and preparing a response reduces the indefinite. But reflection soothes only when it produces a structure. Interminable analysis does the opposite: it feeds the uncertainty it claims to resolve. The article devoted to the Kidney will distinguish lasting fear from sudden fright, and what becomes of the will when it separates from thought: wanting without doing, doing without wanting.

A thought that never decides

Let’s come back to the chain of Lingshu 8, this time in full:

“When the Heart applies its attention, that is the Yi (the idea); when the Yi fixes itself, that is the Zhi (the resolve); when the Zhi perseveres and reworks, that is the Si (reflection); when the Si carries far, that is the Lü (deliberation); when the Lü decides upon beings, that is the Zhi 智 (practical wisdom).”

Read in the negative, this sequence offers a surprisingly precise map for listening to cognitive complaints. Rumination is a reflection that never becomes deliberation: a Si that turns without opening onto the Lü. Half-heartedness is the symmetrical, earlier failure: an idea that lights up, sometimes with enthusiasm, but never fixes itself into a stable resolve. And there’s a third failure, less often named: the fixed idea, a resolve that no longer lets itself be reworked by reflection. Thought has stopped too soon and refuses to reopen the file.

Three breakdowns, three different stages. The old text describes thought by its movement rather than by its content, and that’s what makes it clinically useful: rather than asking only what you’re thinking about, there’s much to gain from watching where your thought stops advancing.

Beyond acupuncture

A marked loss of concentration, persistent distress, an inability to function day to day, or dark thoughts should not be interpreted solely through an energetic lens: assessment by a physician or a mental health professional is then indicated. In Québec, Info-Social (8-1-1, option 2) offers psychosocial consultation at all hours, and the 9-8-8 line answers people in distress or thinking about suicide. Acupuncture can take its place within a complementary approach, without replacing the care required.

Consulting in acupuncture

Depending on the pattern, the traditional logic differs: supporting the Spleen and “raising the clear,” nourishing what the Heart lacks, transforming Dampness, or unknotting what vexations have contracted. One detail says a great deal about the place this medicine gives to thought: on the back, near the point associated with the Spleen, the tradition named a point Yishe 意舍 — “the dwelling of the Yi.” The map of the body reserves an address for mental life.

A consultation lets us look together at the mental fatigue, the rumination and the digestive signs that accompany them, rather than applying the same explanation to every form of overthinking.

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Please note — This article presents a model drawn from traditional Chinese medicine; the correspondences described constitute neither a medical or psychiatric diagnosis nor a promise of results.

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