TCM Student - 4 Properties of Yin Yang Theory Schools of TCM State Laws of TCM Study Tools Books on TCM AcuSupplies National Assocs. There are four basic properties that help to understand the relationship of yin and yang and make it easier to apply these prinicples to the microcosm that is the human body.
Nothing is wholly yin or wholly yang.
Each contains even the smallest of seeds of the other inside it. At any given time the two are in a constantly changing balance, with each vying for that one step ahead. If one predominates, it can overact on the other, cause imbalance and lead to disease. They define each other, much as night and day do. One cannot know light without dark, or dark without light.