The Twelve Organs in Chinese Medicine

Chinese medicine describes the body as twelve systems rather than a set of anatomical parts. Each one has a channel running through the body, a set of functions, an element, a paired organ and an hour of the day when it is considered most active. Together they make up what the classical texts call the zang fu.

The names overlap with Western anatomy but the meanings don't. The Chinese medicine Spleen does most of what a physiology textbook assigns to the pancreas. The Chinese medicine Kidney covers growth, ageing and the deepest reserves of the body, which no Western kidney does. We capitalize the organ name when we mean the Chinese medicine system and use lowercase for the anatomical organ.

This page is the map. Each organ below has its own page with its meridian, its traditional patterns and the herbs classically associated with it.

On this page. Zang and fu · The twelve organs · The organ clock · The five elements · Questions

Zang and fu

The twelve split into two groups of six.

The zang are the six yin organs, meaning Lung, Spleen, Heart, Kidney, Pericardium and Liver. The texts describe them as solid, and their job is to make and store the fundamental substances, meaning qi, blood, fluids and essence.

The fu are the six yang organs, meaning Large Intestine, Stomach, Small Intestine, Bladder, San Jiao and Gallbladder. These are described as hollow, and their job is to receive, break down, move and discharge. They handle throughput rather than storage.

Every zang is paired with a fu, and the pair shares an element. That pairing is why a page about the Lungs keeps mentioning the Large Intestine, and why a practitioner looking at one will often ask about the other.

The Chinese term for the whole system is zang fu. You will also see it written zangfu or zang-fu. The Gallbladder is the odd one out among the fu. It is hollow and yang like the rest, but it stores bile rather than passing waste through, so the texts also count it among the extraordinary organs.

The twelve organs

Fire is the only element with four organs instead of two. The Heart and Small Intestine are the primary pair; the Pericardium and San Jiao are described as the Heart's protective layer and the passage that moves fluids and heat through the body's three divisions.

The organ clock

The twelve channels are described as a single circuit that the qi travels once every twenty-four hours, spending two hours in each. The sequence starts at the Lung and returns to it. Note that the order in this table is the order of the circuit, which is not the same as the order of the elements.

You will see this called the organ clock, the body clock or the horary cycle. It is a traditional framework for reading the timing of things. Waking at the same hour each night, or feeling heaviest at the same point each afternoon. It is not a physiological schedule.

The five elements

The five elements, or wu xing, are the organizing frame underneath the pairings. Each element takes two organs, a season, a color, a climate, a flavor and an emotion.

The Pericardium and San Jiao sit under Fire alongside the Heart and Small Intestine.

The elements are also described as acting on each other, one generating the next around the circle, and one checking another across it. That relationship is why a practitioner reading a Liver pattern will often look at the Spleen, and why the Kidney comes up in a conversation about the Heart.

Questions people ask

What does zang fu mean? Zang means the six solid yin organs and fu means the six hollow yang organs. Together the term covers the whole twelve-organ system and the theory that describes how they relate to each other.

Are the Chinese medicine organs the same as the Western ones? No. The names were mapped onto Western anatomical terms during translation, and the overlap varies a great deal. The Lung is close. The Spleen is barely related to the organ of that name at all. It is more accurate to read them as functional systems that happen to share a name.

What is the organ clock used for? It is a traditional way of reading timing. Which hours a person feels a change, wakes, or has least energy, taken as information about which system is involved. It is a framework for interpretation, not a schedule to follow.

Why does Fire have four organs? The Heart is described as the Emperor and the texts say it should not be touched directly. The Pericardium is the layer that takes the impact on its behalf, and the San Jiao is its paired yang organ. So Fire ends up with two pairs where the other elements have one.

Which organ page should I start with? The Liver and the Spleen are the two that come up most often in Chinese herbal medicine, and each pairs with a fu organ, so either is a reasonable entry point into the rest.