Of all the ideas in Chinese medicine, Qi (氣) is the most central and the most easily misunderstood. Everything the body does, it does through Qi; every substance we will study is a form or product of Qi. If you understand Qi clearly, the rest of the system falls into place around it.
Neither pure energy nor pure matter
Students often ask, "Is Qi energy or is it matter?" The honest answer is: it is neither, exactly, and it is best not to force it into a Western box. The old translations — "vital energy," "life force" — capture part of it but mislead if taken too literally.
A more useful way to think of Qi is as vital activity — the living functioning of the body. Qi is at once the subtle substance that flows through us and the activity that substance performs. Where there is warmth, movement, transformation, protection and holding, there is Qi at work. Qi is what makes the body a living, functioning whole rather than an inert collection of tissues. Classical texts place it on a spectrum: at its most rarefied, Qi is almost immaterial (like the Qi of the air); at its most condensed, it becomes the visible substances of the body. Matter and function are not two different things here but two ends of one continuum, and Qi is the name for the whole.
Qi is everywhere
The concept is not limited to the body. To the classical mind, all of nature is Qi in its countless forms and movements — the Qi of Heaven in the weather, the Qi of Earth in the soil, the Qi of the seasons. The human being is simply one especially organised expression of this universal Qi. This is why the person can never be separated from the environment: we are made of, and continuous with, the same Qi as the world around us.
Where the body's Qi comes from
In the body, Qi has three great sources, and knowing them is directly useful in the clinic:
- Prenatal (Source) Qi — the original endowment inherited from our parents at conception, stored by the Kidneys. It is the deepest reserve, the constitutional foundation we are born with, and it is difficult to replenish.
- The Qi of food — extracted by the Spleen and Stomach from what we eat and drink. This is the great renewable source, replenished at every meal.
- The Qi of air — taken in by the Lungs with every breath, the pure Qi of Heaven.
The postnatal sources — food and air — are combined in the chest and, drawing on the spark of the prenatal Qi, produce the Qi that circulates through the whole body. This is why, in Chinese medicine, the Spleen and Lungs are central to vitality: weaken the digestion or the breath, and the body's whole supply of Qi suffers. It also explains a core clinical strategy — that even a person with a weak constitution (limited prenatal Qi) can be strengthened by supporting the postnatal sources, good food and good breath.
Why start here
We begin the study of the substances with Qi because everything else depends on it. Blood is moved and made by Qi; Fluids are transformed by Qi; the organs function through their Qi. In the lessons that follow we will see exactly what Qi does (its functions), the specific forms it takes in the body (its types), and the characteristic ways it goes wrong (its disharmonies). Master Qi, and you hold the thread that runs through the entire fabric of Chinese medicine.
