The Heart in Korean Medicine: Governing the Blood and the Mind

With the map of the organs in hand, the individual organs begin — and Korean Traditional Medicine (KTM), the traditional healing system of Korea also known as Hanbang (한방), starts the organ theory with the heart. The reason is intuitive: to be alive is, in a sense, for the heart to beat. The heart is the center of all the organs — the sovereign organ (君主之官) — and the source of being alive; the lung follows it, which suggests the order tracks the sequence of Qi and Blood metabolism. The heart in KTM has two governing roles: it rules the blood and vessels, and it rules the mind.

The Heart Governs the Blood and Vessels

The first role is the one closest to the modern picture: the heart governs the blood and vessels (心主血脈). A normal, steady heartbeat depends on heart Qi and heart Blood being both full and well coordinated; from that beat, together with the movement of the vessels, blood is carried out to the whole body. This is the heart as pump and as the ruler of circulation — and it is why so many problems that present as palpitations are read, in KTM, as a question about the state of heart Qi and heart Blood.

The Heart Governs the Mind

The second role is less familiar to modern ears: the heart governs the mind (心主神明). In KTM, mental activity is ruled by the “mind,” and that the mind sits in the chest is something both East and West have long sensed. The hard question is what the mind actually is, and KTM does not pin the heart’s governance of mental life to a visible material. But the relationship shows itself in reverse: when the heart is troubled — palpitations, a sense of heat around the heart — refined mental activity cannot work properly.

There is a telling phrase for this: the heart is “that which meets things.” Witness a sudden event, or watch a sad film, and it is the heart that feels the impact first — which is why mental life is said to be the heart’s domain. (A note worth keeping: while the heart meets the event, the start of the response to it is handled by the liver, the organ KTM calls the general.) The state of the heart’s rule over the mind is judged through mental condition, consciousness, the capacity to think, sleep, and concentration — and the plain fact that a settled mind sleeps well is the foundation of how KTM approaches insomnia.

Two Hearts: the Blood Heart and the Spirit Heart

Classically the heart is described in two aspects according to its functions: the “blood heart” (the physical, flesh-and-blood organ) and the “spirit heart” (the seat of mental activity). Because the spirit heart has no fixed shape or location, some have argued that the spirit heart is really the brain.

The reading offered here is a little different. Mental life is the high-order activity that appears once the five Zang, each receiving Qi and Blood from the heart, complete their own physiological work — and in KTM each of the five Zang gives rise to its own emotions and thoughts. On this view there is no separate “spirit heart” sitting apart; the physical blood heart is the real thing that governs the mind. Put in terms of substance and function: the heart’s substance — its nourishing, blood role — is the blood heart, and the heart’s function — mental activity — is the spirit heart. Two names, one organ.

The Pericardium

Wrapping the heart is a membrane KTM calls the pericardium (心包). It borders the heart without being a tissue truly separate from it, and its role is protective: when a pathogen invades toward the heart, the pericardium takes the blow so that the heart does not fall ill at once — so that the heartbeat is not stopped. It is, in effect, the buffer that guards the sovereign.

In Summary

The heart is the sovereign organ, and the organ theory of Korean medicine opens with it. It governs the blood and vessels — driving circulation on full, coordinated heart Qi and heart Blood — and it governs the mind, so that consciousness, thought, and sleep are read through its state and a calm heart underlies good sleep. The old split between a physical blood heart and a formless spirit heart resolves, on the view taken here, into a single organ whose substance nourishes and whose function is mental life; and the pericardium stands around it as a protective buffer. From the sovereign, the organ series continues.

Related reading: The Organs in Korean Medicine · Heart Palpitations in KTM

This article reflects the clinical observations and teaching practice of Professor Seungho Baek, Professor of Korean Medicine at Dongguk University College of Korean Medicine, specializing in Pathology and Oncology.