This is one of the five patterns of the Blood level, the fourth and last level of the Four Levels theory. This means this is a very serious pattern where an External Pathogen has penetrated deeply within the body.

Collapse of Yang indicates an extremely severe state of Emptiness. It also implies a complete separation of the Yang from the Yin. Collapse of Yang is often, but not necessarily, followed by death.

The main manifestations are a general feeling of cold, cold limbs, weak breathing, profuse sweating of the forehead with an oily sweat, no thirst, frequent profuse urination or incontinence, loose stools.