In Traditional Chinese Medicine, this interconnectivity is understood as a group of four opposites, collectively known as the Eight Principles. The table below shows the inverse relationship of yin-yang.
[[File:The eight principles table.png]]<br>
Yin and yang are in constant flux. If one becomes unbalanced in the body, illness occurs. For example, since yin is cold, an excess of yin can cause illnesses such as insomnia and dry-mouth. Conversely, a yang deficiency can cause cold limbs and a sickly-complexion. Good health then, is maintained by balancing yin and yang.
===Five Phases theory===
[[File:420px-Wuxing en.svg.png|thumb|300px|left|Interactions of Wu Xing]]