Po

Where the hun are described as ethereal and volatile, the po are their structural opposite in the classical Chinese scheme: yin rather than yang, heavy and corporeal rather than cloud-like, and conventionally counted as seven, the qipo, rather than three. The po are associated with the body's physical vitality and its appetites, the sensations, drives and reflexes that keep an organism functioning at the level of raw survival rather than the reflective, wandering consciousness attributed to the hun.

Within correlative cosmology, the po are linked to the lungs and to metal among the five phases, an association that, like the hun's link to the liver and wood, was treated as medically consequential rather than merely symbolic: respiratory disorder and disturbances of the po were understood as connected, and treatment could target either. Sudden fright, a common concern in traditional Chinese medical writing, was sometimes explained as a disturbance to the po specifically, distinct from the disturbances attributed to the hun.

At death, the po do not ascend as the hun are said to; they remain with the body, sinking toward the earth and the grave, which is the direct cosmological basis for the entire apparatus of ancestral tomb offerings and grave-based ritual in Chinese religious practice. A hun addressed through spirit tablets and ancestral altars in the home, and a po addressed through offerings and maintenance at the physical burial site, together made up a complete programme of care for the dead, each soul-type requiring its own distinct kind of ongoing attention.

The asymmetric count at the centre of Chinese soul theory, three hun against seven po, is not an arbitrary numerological flourish; it follows the same yin-yang logic that assigns the hun to the lighter, ascending, less numerous category and the po to the heavier, more numerous, earthbound one. Odd numbers were conventionally associated with yang and even numbers with yin in Chinese correlative thought generally, which makes the specific counts, three and seven, both odd, a slightly more complicated case than a simple parity rule would predict, and later commentators and religious specialists offered varying explanations tying the specific numbers to particular deities, body locations or ritual functions rather than treating them as self-evident.

What both counts agree on is a shared structural claim: a person is not unified but genuinely plural, composed of multiple hun and multiple po together, whose harmonious cooperation constitutes health and whose disharmony, excessive wandering by a hun, or excessive heaviness and disorder among the po, constitutes illness or spiritual instability. This plurality is one reason Daoist internal alchemy describes its central task not as strengthening a single soul but as marrying two populations of souls that pull, by their basic yin-yang natures, in different directions.

Later syncretic Chinese religious and medical texts sometimes assign names, colours, associated organs and even individual personalities to each of the three hun and seven po separately, elaborating the basic pairing into a considerably more detailed internal pantheon, evidence of how productive the underlying hun-po distinction proved to be as a framework other Chinese religious specialists kept building on for centuries after its earliest attestation.