In Traditional Chinese Medicine we learn the theories of yin and yang and the relationships between the two: (1) opposition: that all things have two aspects; (2) interdependence: yin and yang create each other; (3) mutual consumption: yin and yang control each other; (4) inter-transformation: yin and yang transform into each other. These relationships can arise in health and in illness when Yin and Yang have been left in an unbalanced state for a period of time. However, when the balance is impaired for a long enough time another possibility occurs: the loss of relationship between Yin and Yang, and their separation. It is this process and stage that is often poorly understood.