Korea

The uieop, from 958

A kingdom made healing an examined profession

Korean medicine became a licensed occupation in 958. The Goryeo court, ruling from Gaeseong, put the medical licensing examination into effect that year and recruited three physician officers through it in 960.

The examination ran in two parts. One covered medicine. The other, jugeumeop, covered feeling the pulse and acupuncture. A candidate from the provinces climbed three stages: a regional preliminary, the first examination, then the final. In 1057 and 1058 the court printed nine medical books of the Han, Sui, and Tang dynasties for its students.

An examination fixes what counts as competence. The Chinese classics arrived on the peninsula and were set as a syllabus, tested against, and graded. Reading a pulse became something the state could certify or refuse, which put an instrument-free assessment of the body under public scrutiny.

Joseon, 1399 to 1433

Hyangyak, and the remaking of a borrowed medicine

The Hyangyakjipseongbang of 1433 is where Korean medicine stops being an import. Hyangyak means local medicine, the pharmacy of the peninsula's own hills, fields, and coasts. The work revised an earlier compendium of 1399 and reconciled Korean herb names with their Chinese counterparts.

The historian Lee Kyung-lock calls what happened the Joseon-ization of Chinese medicine. Most prescriptions came from Chinese books. The selection, the chapter order, and the disease list were Korean decisions, taken after close study of the imported system.

New diseases entered the record because Korean physicians kept seeing them. Jaundice and unremitting nasal discharge were symptoms in the Chinese scheme. In Joseon they became conditions with treatments of their own. The illnesses rampant in the late Goryeo and early Joseon years shaped which chapters got written at all. Infectious disease and diabetes were among them.

Fitting the remedy to the ground is one step from fitting the remedy to the person, and Korean medicine took that second step in 1894.

Hanyang, 1596 to 1613

The Donguibogam orders the body, not the disease list

The Donguibogam, the Treasured Mirror of Eastern Medicine, is the central text of Korean medicine. King Seonjo commissioned it in 1596 with the peninsula wrecked by invasion. Compilation ran through war and a change of reign. Heo Jun completed the manuscript in 1610 and it was published in 1613.

Its 25 volumes fall into five sections. Naegyeong covers the internal organs and Oehyeong the external form. Japbyeong covers the miscellaneous disorders, Tangaek the decoctions, and Chimgu acupuncture and moxibustion. The order is anatomical and functional. A physician reading it works outward from the body instead of inward from a list of named diseases.

UNESCO inscribed the book on the Memory of the World Register in 2009. The citation credits it with developing the ideals of preventive medicine and state public health care. A physician who is asked to prevent illness has to be able to read a person who is not yet sick, which is the harder half of the job.

The anthropologist Taewoo Kim documented three schools in South Korea in 2019 that read the Donguibogam as a working clinical text. One organizes practice around pulse diagnosis, one around the cause of disease, one around appearance and form.

Jeong, gi, shin

What the Donguibogam says a person is made of

The Donguibogam opens with cosmology. The body runs by the same laws as the world around it, and a human life rests on three treasures that answer one another. Jeong is the essence. Gi is the vital force. Shin is the spirit.

Gi is the Korean reading of the Chinese qi. It moves along the meridian channels, animates the organs, and thickens or thins across a life and a year. Health in this physiology is gi in right measure and motion. Heo Jun held that all illness arises from imbalance, and he ranked regimen and meditation above prescription as the first response.

The Unified Model of Tone reads gi in right measure as a claim about a defended value. Gi behaves like a regulated variable rather than a substance. It can run too high or too low, and it has a correct middle a physician works to restore.

Gi is not a structure anatomy has found, and the meridians are not nerves. The behavior the Donguibogam assigns to gi is the behavior of a nervous system holding the body in a regulated state. This model calls that state tone, and measures it. The Korean observation stands on its own record. The naming is ours.

Chimsul and Saam

Needles placed by relationship, and treatment by hand

Korean acupuncture, chimsul, is specified rather than general. A 2014 data-mining study of the Donguibogam's acupuncture cases pulled out 114 acupoints used across 114 conditions, with CV4 and CV6 leading at 16 uses each. The concentration sits low on the abdomen, matching the text's emphasis on breathing and cultivation.

Korea then produced its own needling logic. Saam acupuncture treats with four needles at most, selected from the five shu points by the creation and control relationships between the meridians. Its founding manuscript is dated between 1644 and 1742, and tradition assigns it to an anonymous Buddhist monk. Chinese five-element practice chose points along one meridian. Saam reaches across meridians, and the choice is governed by relationship.

The hand kept its place alongside the needle. The Donguibogam records the guiding, pressing, and kneading arts under the names doin, anma, and angyo, listed as methods of preserving health. That thread was rebuilt in living memory. The Korean Society of Chuna Manual Medicine for Spine and Nerves was founded in 1991 and approved as a subsociety of Korean medicine in 1992.

Modern chuna covers thrust, mobilization, distraction of the spine and joints, and soft-tissue release. It entered Korea's National Health Insurance in 2019. Survey data recorded a sharp rise in outpatients receiving chuna between 2017 and 2020.

Every one of these levers is graded. A needle is placed by relationship and count, a hand by depth and direction. The Unified Model of Tone reads that as input quality, where the character of an input decides the response the body gives it.

Lee Je-ma, 1894

Sasang says the healthy value differs by person

Sasang constitutional medicine is the most original claim Korean medicine makes. Lee Je-ma published the Dongui Suse Bowon, Longevity and Life Preservation in Eastern Medicine, in 1894, and sorted people into four constitutions. The typology dates to the late nineteenth century, not to antiquity, and it remains in practice.

Each constitution is defined by a pair of organ systems, one large and one small. The Taeyangin has a large lung and a small liver. The Taeeumin reverses that pair. The Soyangin has a large spleen and a small kidney. The Soeumin reverses that one. The pairs work as two seesaws, lung against liver and spleen against kidney.

Two patients with the same complaint can need opposite care, because the complaint sits in two different constitutions. The herb that steadies a Soeumin may unsettle a Soyangin. Diet, work, and regimen are all read against the person's own baseline before the illness is addressed at all.

The Unified Model of Tone reads Sasang as a set point argument in a nineteenth-century Korean vocabulary. A set point is the value a system defends and returns to. Lee Je-ma's claim is that the value differs by person, that the difference is stable, and that treatment which ignores it will push half of its patients the wrong way.

Most healing traditions describe a regulated state and leave its correct value implicit and universal. Korean medicine wrote the variation down, gave it four names, and built a pharmacy around it.

Cohorts and genomes

What researchers found when they tested the four types

Sasang has been tested with modern tools for more than two decades, and the results split. A 14-year prospective cohort followed 3,529 Korean adults aged 40 to 69 from 2001 to 2014 and recorded 1,591 new cases of metabolic syndrome. Against the Soeum type as reference, the Taeeum type carried a hazard ratio of 2.03 and the Soyang type 1.33.

Genetics has been thinner. A genome-wide analysis of 1,222 Koreans reported three associated chromosomal regions. The authors flagged high false discovery rates for each variant and called for validation in larger samples.

Sorting people into the types reliably is the hard problem. A review of the diagnostic methods put automated body-shape analysis near 52 percent accuracy and voice analysis near 58 percent. The QSCC II questionnaire claimed 70.8 percent, fell short in later testing, and could not identify Taeyangin at all. The reviewers recommend combining the methods rather than trusting any one.

That pattern is what the Unified Model of Tone predicts. A constitution describes where a person's regulation sits rather than a gene or a body shape. The signal survives across fourteen years of health outcomes and scatters when a single channel tries to capture it in an afternoon. Outcomes that depend on regulation hold the effect. Snapshots of voice, face, and build do not.

Seoul, present day

A dual system, and 24,560 licensed doctors

South Korea runs a strict dual medical system. Doctors of Korean medicine train and practice alongside their biomedical colleagues, with their own clinics, hospitals, colleges, and a bureau inside the Ministry of Health and Welfare. As of 2017 the country licensed 24,560 Korean medicine doctors.

Twelve universities carry a Korean medicine faculty, including one specialized graduate school. The college route runs six years and the graduate route four. Crossing over is rare. Only 319 practitioners, about 1.3 percent, hold both licenses.

Sasang physicians still practice the typology and research groups still test it. The Donguibogam remains in print, in modern Korean translation, and in clinical use. Chuna sits on the national insurance schedule. The line from a state examination in 958 to an insurance code in 2019 runs unbroken.

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