What Is East Asian Medicine?

When and how did East Asian medicine originate? No single brief answer suffices. Yet recent discoveries of excavated texts have brought its contours into remarkable clarity.

China's earliest medical records appear in oracle-bone inscriptions alongside divination and ritual. Disease was not yet a domain of medicine but a phenomenon negotiated through invisible forces. Mayanagi Masanori, professor emeritus at Ibaraki University, concluded in "On the Emergence of Medicine" (2014) that "Chinese medicine first acquired its logical foundations in the Qin-Han transitional period; its key concepts emerged in the Former Han; and the systematization of medicine made decisive progress in the Later Han."

The decisive turning point was the 1973 excavation of the Mawangdui tombs (sealed 168 BCE). From sealed chambers emerged fifteen medical manuscripts on silk and bamboo. Donald Harper of the University of Chicago, in Early Chinese Medical Literature: The Mawangdui Medical Manuscripts (Kegan Paul International, 1998), provided the first English translation and demonstrated how, between the fourth and first centuries BCE, physicians began to distinguish their practice from shamanism. Medical care and ritual healing coexisted; medicine did not cleanly supplant shamanism.

Yamada Keiji identified at least five distinct intellectual schools within the Huangdi Neijing (Japanese Journal of Oriental Medicine, 1991), recognizable from the interlocutors in the dialogues. Nathan Sivin of the University of Pennsylvania re-dated the received Suwen and Lingshu to the first century BCE (Journal of Asian Studies, 1988): "The Huangdi Neijing is not one book, but a collection of diverse writings, many of which disagree with one another." East Asian medicine is a deposit formed across two millennia—not the gift of a divine sage, but the construction of generations of practitioners.

The period from the Later Han through the Three Kingdoms saw Chinese medicine crystallize into three foundational classical texts: the Suwen and Lingshu, the Shennong Bencaojing, and the Shanghanlun with the Jinkui Yaolue. Together with the acupoint manual Mingtang, these six works form the skeleton of East Asian medicine.

Paul U. Unschuld of Charite Medical University Berlin observed, in his annotated translation Huang Di Nei Jing Su Wen (UC Press, 2011), that Chinese medicine is defined by "patterned knowledge"—multiple explanatory paradigms that coexist and are applied contextually rather than being resolved into a single unifying theory. That the Suwen and Lingshu do not perfectly agree is not a flaw but a structural feature.

The Shennong Bencaojing was compiled around 5 CE, classifying 365 drugs into three grades. The term bencao means "the essence of medicinal substances." The Shanghanlun and Jinkui Yaolue by Zhang Zhongjing (early 3rd century CE) systematize the treatment of acute cold-damage disorders and miscellaneous chronic diseases. These classics served as the shared reference axis for all of East Asian medicine across two thousand years.

Meridians and acupoints form the core of East Asian medicine's conceptualization of the body—but they did not exist in completed form from the beginning. Mayanagi Masanori organized their systematization into four stages of standardization (Igaku Shuppan, 2009).

Stage One (before the 2nd century BCE): the Mawangdui texts describe only eleven vessels; needling technique is entirely absent; treatment centered on moxibustion. Stage Two (1st century CE): twelve meridians and 365 points were mapped onto the cosmic numbers of months and days, though only approximately 132 points had been verified in practice. Vivienne Lo of University College London demonstrated that later acupuncture theory drew on two source traditions: the cultivation of qi in sexual practices, and acupoints mapped as landscape metaphors (Medieval Chinese Medicine, RoutledgeCurzon, 2005).

Stage Three (3rd-4th centuries CE): doctrinal standardization through the Mingtang (349 points) and Zhenjiu Jiayi Jing (356 points). Stage Four (Northern Song, 11th century): Wang Weiyi's imperially authorized Tongren Shuxue Zhenjiu Tujing (1026) fixed 354 points and bronze training figures were cast. In 2006, WHO-led international consensus completed the global standard for acupoint location.

Materia medica is the second great pillar of East Asian medicine. Mayanagi Masanori demonstrated (Studies in the History of Biology, 1989) that it constituted a vast integrated system encompassing pharmacology, natural history, botany, zoology, mineralogy, and processing science.

Its three core purposes: to identify drugs accurately (genuine vs. counterfeit, high-quality vs. inferior); to organize drug actions through the five flavors (sour, bitter, sweet, acrid, salty), four qi (cold, cool, warm, hot), and toxicity; and to specify methods of use through the hierarchical jun-chen-zuo-shi structure and five preparation forms (decoction, powder, paste, pellet, pill). The 365 drugs of the Shennong Bencaojing mirror the 365 days of the year—a deliberate cosmic correspondence. Unschuld showed how fundamentally this differs from the natural-historical organization of Western pharmacy (Medicine in China: A History of Pharmaceutics, UC Press, 1986). Japan's Mori Risshi produced the world's most accurate reconstruction in 1854. Materia medica was shaped in China, and its precision was further refined in Japan through philological reconstruction and textual criticism.

Many dictionaries describe "medicine and food share the same origin" as an ancient Chinese saying. Mayanagi Masanori demolished this assumption (Shinica, 1998): the Japanese phrase "ishoku dogen" was coined in 1972 for an NHK cooking program. Even the Chinese equivalent cannot be verified in classical texts before the late Qing dynasty.

Yet if the phrase is new, the underlying thought is ancient. The Rites of Zhou placed the food physician—who managed the king's diet—at the head of the four-physician system. The Suwen and Lingshu systematized this tradition as the five-flavor theory: sour nourishes the liver and sinews; bitter nourishes the heart and blood; sweet nourishes the spleen and flesh; acrid nourishes the lungs and skin; salty nourishes the kidneys and bones. After the third century CE, systematic food therapy faded from medical practice, but the thought of dietary appropriateness survived, absorbed into materia medica. East Asian medicine's distinctive continuity between "treatment" and "nourishment" (yangsheng) persists across two thousand years.

Why does East Asian medicine differ so profoundly from Western medicine? Shigehisa Kuriyama, professor at Harvard University, has shown that the divergence runs far deeper than technique: it lies in the very sense modalities through which the body is apprehended.

Kuriyama's major work, The Expressiveness of the Body and the Divergence of Greek and Chinese Medicine (Zone Books, 1999; Japanese translation Misuzu Shobō, 2008), received the William H. Welch Medal of the American Association for the History of Medicine in 2001. The book takes a triptych structure: "Styles of Touching" (pulse and blood vessels), "Styles of Seeing" (muscle and color), "Styles of Being" (blood and breath).

The core insight of Part One: Greek and Chinese physicians, when taking the pulse, were quite literally feeling for different things. "Theoretical preconceptions at once shaped and were shaped by the contours of haptic sensation" (p. 60). "The history of conceptions of the body must be understood in conjunction with a history of conceptions of communication" (p. 107). Part Two: Greek medicine dissected the body into muscles and joints; Chinese physicians did not even develop a discrete vocabulary for musculature (p. 111), seeing instead color (se) and surface contour. "In tracing the crystallization of the concept of muscle, we are also, and not coincidentally, tracing the crystallization of the sense of an autonomous will" (p. 144). Kuriyama's conclusion: "Alternate visions of the body reflect alternate readings of the vital self" (p. 192). East Asian medicine is not a primitive precursor to Western medicine. Both traditions drew, from the beginning, entirely different maps of the body.

East Asian medicine is not the medicine of China alone. The sinographic cultural sphere—China, Japan, the Korean Peninsula, and Vietnam—formed, through the medium of classical Chinese texts, a shared medical tradition over fifteen hundred years, even as each region developed its own distinctly adapted variant.

Mayanagi Masanori's comparative analysis of approximately 28,000 surviving pre-modern medical texts across the four countries (Journal of the Japan Society for the History of Medicine, 2010) notes that the metaphor of "branches growing from a single trunk" is inaccurate. More precisely: "The fruits of the diverse trees that grew in the forest of Chinese medicine were carried to surrounding regions; only those seeds that could adapt to each local soil took root—or fused with indigenous varieties—to form different forests on different terrain."

Each country's indigenization was marked by a comprehensive medical encyclopedia by a single physician: Manase Dōsan's Keiteki Shu (Japan, late 16th c.), Heo Jun's Dongui Bogam (Korea, early 17th c.), and Le Huu Trac's Y Tong Tam Linh (Vietnam, late 18th c.). Marta Hanson of Johns Hopkins University demonstrated a clear medical regionalism in Ming China ("Northern Purgatives, Southern Restoratives," Asian Medicine, 2006): northern physicians favored purgatives; southern physicians favored tonification. This Southern assertion of regional distinctiveness provided Japan, Korea, and Vietnam with a model for relativizing Chinese medicine and claiming the legitimacy of indigenous practice.

Japanese Kampo traces its origins to the fifth and sixth centuries CE. In 984, Tanba Yasuyori compiled the thirty-volume Ishinpo. The clinical foundations of modern Kampo were shaped by two Edo-period schools.

The Goseiha (Later Generations School), centered on Manase Dōsan (late 16th century), drew on the Jin-Yuan four masters for sophisticated pattern differentiation. The Kohoha (Ancient Formula School), initiated by Nagoya Gen'i (1628-1696), returned to Zhang Zhongjing's Shanghanlun and criticized the Goseiha for theoretical elaboration at the expense of clinical efficacy. The four great Kohoha masters were Goto Gonzan, Kagawa Shuan, Yamawaki Tōyō (who performed Japan's first human dissection in 1754), and Yoshimasu Tōdō (1702-1773, proponent of the one-poison theory).

The driving force of the Kohoha was "shinshi jikken" (personal empirical verification). Terasawa Katsutoshi, professor emeritus at the University of Toyama and eighth-generation successor to Yoshimasu Tōdō, defined this principle: "To place the facts one has verified through one's own eyes and hands as the most reliable foundation, and to begin all argument from there—an antithesis to the speculative mode of thought that developed in China." Mukaiyama Shizuka of Ritsumeikan University demonstrated that research on the Shanghanlun reached 400 works in Japan between the late 17th and early 18th centuries, and that the formulae of the Shanghanlun occupied an important place within the clinical experience of treating measles, smallpox, typhoid fever, and influenza (Ritsumeikan Asia Japan Studies, 2022). Japanese Kampo is not a mere translation of Chinese medicine but a distinctive medical tradition shaped by Goseiha pattern differentiation, Kohoha empirical verification, and Edo philological scholarship.

East Asian medicine entered acute crisis in the late nineteenth and early twentieth centuries. In Japan, the Meiji government's 1895 rejection of the petition for continuation of Chinese medicine stripped Kampo of its legal basis. In China, the Qing court banned court acupuncture in 1822; the Nationalist government's 1929 "Resolution to Abolish Old Medicine" brought the tradition to the edge of institutional extinction.

Mayanagi Masanori demonstrated that Japan played a decisive role in the revival ("Japan's Contribution to the Formation of Modern Chinese Medical Acupuncture," Journal of the Japan Society of Acupuncture and Moxibustion, 2006). The central figure was Cheng Dan'an (1899-1957). Cheng studied at the Tokyo Advanced Acupuncture School in 1934-35 and acquired a Japanese-printed edition of the Shisijing Fahui (Yuan dynasty, Hua Shou)—a text lost in China and preserved only in Japan. He wrote in his preface: "Compared with Japanese translations and our old texts, it is yet more detailed and complete." Cheng systematically translated Japanese acupuncture texts into Chinese and trained thousands of students. The first edition of the unified textbook Zhenjiu Xue Jianyi (1960), compiled after the founding of the People's Republic, was the work of Cheng's disciples. The Chinese medical texts preserved in Edo-period Japan were reverse-transmitted to China to become the structural foundation of modern Chinese medicine.

Contemporary Japanese Kampo synthesizes the Goseiha and Kohoha traditions. WHO completed the international standardization of acupoint locations in 2006; Kampo pharmaceuticals are covered under national health insurance; the COVID-19 pandemic renewed global interest in traditional medicine at scale.

Yet East Asian medicine retains an unresolved structural problem. For the same clinical presentation, different schools produce different explanations. The treatment "works," but why it works cannot be structurally accounted for. When the pattern (zheng) is determined, further inquiry tends to halt prematurely; the multi-layered process by which the disease was generated remains invisible beneath the diagnostic label. To use Paul Unschuld's language: the coexistence of multiple paradigms within East Asian medicine—"patterned knowledge"—is a structural richness, not a defect. Yet this richness simultaneously creates problems of reproducibility and verifiability in clinical decision-making. Can the vast accumulated inheritance of classical texts be integrated in a form useful for contemporary clinical judgment? The answer to this question is proposed in the chapter that follows.

1. The classics were, from the start, a division of labor

Anyone who has read through the foundational texts of East Asian medicine is left with a curious impression. Each classic appears to be treating the same phenomenon—disease—yet each asks an entirely different question.

The Suwen asks: Why does disease arise, and what form does it take?
The Lingshu asks: Where and how does one act upon the body?
The Nanjing asks: Why is this particular person prone to illness in the first place?
The Shanghanlun asks: How does disease deepen as time passes?
The Wenbing Tiaobian asks: Where in the body's spatial geography does disease lodge itself?
The Shennong Bencaojing asks: How do medicines act, and to which layer do they reach?

These questions seem independent. But when one truly tries to understand a single patient, they constitute a set of questions that cannot serve as answers unless they complement one another. The Suwen gives the "why"; the Lingshu the "how"; the Nanjing the "who." The Shanghanlun gives the "when"; the Wenbing Tiaobian the "where"; the Bencaojing the "with what." The corpus of classics came, in the end, to constitute a division of labor for the multidimensional description of disease.

This was a division of labor without a master blueprint. No one held the complete picture; each classic refined its appointed range across two thousand years. The major advances of each era came by discovering a new dimension and adding a new classic at that frontier. The Later Han Shanghanlun introduced the temporal axis; the Ming-Qing Wenbing Tiaobian added spatial localization; the Song-Yuan schools refined the dynamics of qi, blood, and fluids. The classics accumulated in layers.

2. And yet, the book that integrates them was never written

Herein lies a foundational difficulty that has accompanied East Asian medicine for two thousand years. The book that would integrate this division of labor was never, in the end, written.

Each classic elaborated its appointed dimension and reserved the others as "separate problems." The Suwen pairs with the Lingshu, but they do not perfectly cohere. The constitutional theory of the Nanjing connects to the Suwen's discussion of pain, but no work articulates that connection explicitly. The six-channel differentiation of the Shanghanlun and the triple-burner differentiation of the Wenbing Tiaobian are clearly describing the same object in different coordinate systems, yet no one has redrawn them as a single unified coordinate. The three grades of the Bencaojing suggest to which layer a drug's action reaches, but never name what that layer is.

This was not negligence on the part of the ancients. Ancient books could attain depth only by limiting the scope of problems they could handle. The Suwen attained the depth that allows it to be consulted fifteen hundred years later precisely because it concentrated its energy on the theoretical refinement of qi, blood, and fluids. The Shanghanlun survives as the source of many of the Kampo formulae most widely used in contemporary Japan, because it concentrated on the dynamic description of the six channels. Specialization produced the excellence of each classic. The other side of that excellence, however, was that the place for describing the relations among dimensions remained unoccupied.

The emergence of the Wenbing School in the Qing dynasty was one response to this empty place. Wu Jutong's Wenbing Tiaobian (1798) acknowledged that the six-channel differentiation of the Shanghanlun could not fully handle warm-heat diseases, and introduced a new coordinate system of the four aspects (wei-qi-ying-xue) and the three burners. This was a response to the limits of the classics from within the classical tradition itself. The tradition kept adding new dimensions in awareness of its own insufficiency.

Yet the relations among these added dimensions remained implicit. Is the Shanghanlun's taiyang stage the same surface pattern as the Wenbing School's wei aspect, or are they different? What is the relation between the shaoyang stage and damp-heat in the qi aspect? Additions were made. But integration was not.

3. Integration happened only inside the heads of skilled clinicians

In fact, integration was always happening. But only in one place: inside the heads of skilled clinicians.

A master physician, examining a patient, traverses the classical corpus unconsciously. Findings derived from the Suwen's pulse theory, treatment direction from the Shanghanlun's passages, constitutional ground inferred from the Nanjing, the triple-burner localization of the Wenbing Tiaobian, the layer of action implied by the Bencaojing—all of these are integrated almost simultaneously, instantaneously. The quality of this integration is what makes a great physician great.

But this integration was untransmittable. The famous remark Nagatomi Dokushōan left concerning abdominal diagnosis—"a father cannot explain it to his son"—was not only about abdominal diagnosis. The synthetic knowledge that traverses the classics is itself essentially tacit knowledge: it resists verbalization and renders transmission across generations difficult.

This is why the history of East Asian medicine has been a repeated cycle of re-invention whenever a great clinician appears. From Manase Dōsan's Goseiha to the Kohōha of Nagoya Gen'i and Yoshimasu Tōdō. From the Kohōha to the philological school of Taki Genkan and his successors. From philology to the Showa-era Kampo revival led by Wada Keijūrō, Yumoto Kyūshin, and Ōtsuka Keisetsu. The great clinicians of each era re-integrated the classical division of labor inside their own heads and implemented it as their own clinical practice. But that integration was often lost before it could be passed to the next generation. When the chain of re-integration was broken in late Qing China, the tradition was driven to the brink of extinction, as we saw in Chapter 9.

That the integrative knowledge has been locked inside individual clinicians is a structural fragility East Asian medicine has carried across two thousand years.

4. Japanese abdominal diagnosis was the closest approximation

The abdominal diagnosis (fukushin) developed by the Japanese Kohōha was the most ambitious response to this difficulty.

As Chapter 8 showed, the lineage from Goto Gonzan through Wada Tōkaku, Nagatomi Dokushōan, and Asada Sōhaku attempted to translate the pathological changes that Chinese classics described conceptually as "qi binding," "blood accumulation," and "water gathering" into palpable physical findings on the abdominal wall: "hardness," "mass," and "fluid sound." This is a two-thousand-year correspondence in which what the Chinese classics articulated conceptually was confirmed tactilely by the Japanese (Junction Points A through H).

The true originality of abdominal diagnosis lies in its integrative character. When a skilled physician touches a single point on the abdominal wall, he or she reads there, almost simultaneously, the constitutional ground, the stagnation of qi, blood, and fluids, the spatial localization of disease within the triple burner, and the stage of pathogenic deepening. Abdominal diagnosis is a technique that integrates multiple dimensions into a single tactile finding. What the Chinese classics scattered as abstract concepts, the Japanese Kohōha attempted to gather in one place: the patient's abdominal wall.

Utsuki Kontai (1779–1848) carried this integration even further. In his major works Fūkan Netsubyō Hō Keihen and Ikeihen, he restructured the Shanghanlun and Jinkui Yaolue as a warp-weft grid of six channels (warp) and miscellaneous diseases (weft), developing the system into 849 and 731 propositions respectively—1,580 in total. No other systematic construction of this scale exists in the history of Japanese Kampo.

Yet here too, the ultimate integration did not reach formal language. A master of abdominal diagnosis reads much from touching a patient's abdomen, but in the end, what is being read and how was never fully described. "A father cannot explain it to his son" is an honest confession of that impossibility. Kontai's warp-weft grid, too, was not adequately appreciated in his lifetime and was half-forgotten after the Meiji period.

Japanese abdominal diagnosis and Kontai's system were the points at which the history of East Asian medicine came closest to the necessity of integration. But they stopped at the summit of tacit knowledge, never reaching formal language.

5. The compression device called zheng rendered the problem invisible

And then, in the modern era, East Asian medicine developed yet another compression device: zheng (Japanese shō), the clinical pattern.

The concept of zheng summarizes a patient's current state in a single word. If the pattern is "Keishi-tō zheng," one prescribes Keishi-tō. Diagnosis and treatment are linked at once by a single label. Clinical efficiency rises dramatically. Zheng is, in a sense, the culmination of two thousand years of clinical compression technique in East Asian medicine.

But this compression has its cost. Zheng summarizes the current configuration of symptoms. It does not answer why those symptoms have arisen, or which dimensions have accumulated to produce that configuration. The constitutional ground recedes into the background; the stage of pathogenic deepening becomes vague; the spatial localization is omitted. Most of the multidimensional structure that the classics accumulated over two thousand years is compressed inside the zheng label and rendered invisible.

The scene sometimes encountered in contemporary Kampo practice—where the pattern is determined without abdominal or pulse diagnosis, by interview alone, and the pattern is changed whenever symptoms change—is the extreme form of this compression. Only the zheng remains; the question of how the zheng is generated has disappeared.

Utsuki Kontai wrote in his Keihen: "The skilled physician does not treat the disease itself but treats the constitutional ground that receives the disease." This proposition pointed, two centuries ago, to a place that the determination of zheng alone cannot reach. But contemporary Kampo practice has often forgotten to look toward that place again.

6. The age of AI brought the problem to the surface

The problem came decisively to the surface the moment one attempted to connect the knowledge of East Asian medicine to AI technology.

In China today, the development of AI-based zheng-classification support systems that reproduce the pattern-determination process of skilled physicians is proceeding at national scale, using deep learning. These systems integrate tongue images, pulse waveforms, and interview data to output a zheng, and they achieve high agreement with expert physicians. At first glance, the AI-fication of East Asian medicine appears to be proceeding smoothly.

But what is being reproduced there is the tacit integration process performed inside the heads of skilled physicians. Without making the multidimensional structure of the classical corpus explicit, AI may reproduce the result but cannot fully account for the structure of the thinking itself. The automation of zheng alone is insufficient for advancing the knowledge of East Asian medicine in any essential sense, because it does no more than reproduce inside a machine the tacit integration discussed in Section 3.

If AI is to truly draw upon the knowledge of the classics, the multidimensional integration performed inside the physician's head must be described in formal language that machines can read. Each dimension that the Suwen, Nanjing, Shanghanlun, Wenbing Tiaobian, and Bencaojing divided among themselves must be made explicit as a single unified coordinate system. This means writing, in formal terms, the "book of integration" that has remained unwritten for two thousand years.

And in fact, this is not the invention of something new. It is the act of writing down, in one place for the first time, what the classics have been articulating in dispersed form across two thousand years.

7. Therefore, MLMN Theory Emerges Naturally

If we retrace the foregoing argument, the reason MLMN Theory emerges naturally can be stated as follows.

The corpus of East Asian medical classics came, in the end, to take the form of a division of labor for the multidimensional description of disease. Each classic was assigned a different dimension, placed in a relationship of mutual complementarity. But the formal framework that would integrate this division of labor was never written across two millennia. Integration took place only inside the heads of skilled clinicians, and only tacitly.

Japanese abdominal diagnosis and Utsuki Kontai's warp-weft grid were the closest attempts to make this integration physically and systematically visible. But they too, as Nagatomi Dokushōan confessed in "a father cannot explain it to his son," ended without reaching ultimate formal language. The modern zheng raised clinical efficiency by compressing integration into a one-dimensional label, but at the cost of pushing the multidimensional structure of the classics into the background. In the age of AI, this structure can no longer be left unattended. If the knowledge of the classics is to be activated not only inside the heads of skilled physicians but in the spaces of contemporary medical practice and research, there is no path other than making the multidimensional structure explicit in formal terms.

The reason MLMN Theory emerges naturally can therefore be stated simply: because the corpus of East Asian medical classics is itself constructed in a layered, multidimensional manner. Anyone who attempts to remain faithful to the structure of the classics is naturally led toward a formal framework that makes that structure explicit. MLMN Theory is not a new theory brought in from outside. When what the classics themselves have been articulating in dispersed form for two thousand years is transcribed into formal language, the result cannot help but approach this form.

For anyone who attempts to write down on paper the integration that great clinicians have been performing inside their heads for two thousand years, something close to MLMN Theory naturally takes shape there. It is not invention but transcription—a redrawing, as an explicit coordinate system, of the structure that was always already contained in the classics. So this theory is, while new, not new. It is what the classics, across two millennia, were preparing for through their very structure—and what, on that prepared ground, emerges of itself.