Anything can be divided into two, this is yin and yang.
　　The Dao produces one, one produces two, two produces three, three produces myriad things.

The Heavenly Stems and Earthly Branches with Yin and Yang
　　Heavenly Stems: Jia, Yi, Bing, Ding, Wu, Ji, Geng, Xin, Ren, Gui
　　Yin Heavenly Stems: Yi, Ding, Ji, Xin, Gui
　　Yang Heavenly Stems: Jia, Bing, Wu, Geng, Ren
　　Earthly Branches: Zi, Chou, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu, Hai
　　Yang Earthly Branches: Zi, Yin, Chen, Wu, Shen, Xu
　　Yin Earthly Branches: Chou, Mao, Si, Wei, You, Hai
　　 Five Elements and the Stems and Branches
　　Heavenly Stems Earthly Branches
　　Metal: Geng, Xin, Metal: Shen, You
　　Wood: Jia, Yi, Wood: Yin, Mao
　　Water: Ren, Gui Water: Zi, Hai
　　Fire: Bing, Ding Fire: Si, Wu
　　Earth: Wu, Ji Earth: Chou, Chen, Wei, Xu

Anything can be divided into two, this is yin and yang.
　　The Dao produces one, one produces two, two produces three, three produces myriad things.

The Heavenly Stems and Earthly Branches with Yin and Yang
　　Heavenly Stems: Jia, Yi, Bing, Ding, Wu, Ji, Geng, Xin, Ren, Gui
　　Yin Heavenly Stems: Yi, Ding, Ji, Xin, Gui
　　Yang Heavenly Stems: Jia, Bing, Wu, Geng, Ren
　　Earthly Branches: Zi, Chou, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu, Hai
　　Yang Earthly Branches: Zi, Yin, Chen, Wu, Shen, Xu
　　Yin Earthly Branches: Chou, Mao, Si, Wei, You, Hai
　　 Five Elements and the Stems and Branches
　　Heavenly Stems Earthly Branches
　　Metal: Geng, Xin, Metal: Shen, You
　　Wood: Jia, Yi, Wood: Yin, Mao
　　Water: Ren, Gui Water: Zi, Hai
　　Fire: Bing, Ding Fire: Si, Wu
　　Earth: Wu, Ji Earth: Chou, Chen, Wei, Xu

What is Yin and Yang? 　　Yin and Yang originated from ancient Chinese philosophical ideas, which believe that everything in the world has two opposing aspects, Yin and Yang, to explain various phenomena in nature, for example, heaven is Yang, earth is Yin; the sun is Yang, the moon is Yin. The opposition and unity of Yin and Yang are the source of the development of all things. Anything that is vigorous, active, strong, outward, and functional is Yang; on the contrary, anything that is tranquil, cold, inhibitory, internal, and material is Yin. 　　The theory of Yin and Yang is also applied in traditional Chinese medicine to explain the laws of physiological phenomena and pathological changes in the human body. 　　In simple terms, Yin refers to the actual substances of the human body, such as body fluids, including blood, body fluids, tears, mucus, endocrine secretions, and even male semen. As for Yang, it refers to non-physical substances, that is, the functions and energy of the body. 　　When Yin and Yang are balanced, the body is healthy; when they are unbalanced, diseases arise. Yin-Yang Balance Excess Yin, Deficiency of Yang Deficiency of Yin, Excess of Yang Excess Yang: Overactive bodily functions, mental excitement, internal heat, depletion of body fluids, symptoms include fever, thirst, constipation, headache, insomnia, restlessness, etc. Deficient Yang: Decline in bodily functions, reduced activity, internal coldness, symptoms include fatigue, cold limbs, excessive sweating, clear urine, loose stools, etc. Deficient Yin: Insufficient Yin in the body, leading to dry mouth and throat, dry skin, anemia, hormonal imbalance, internal heat, and warm hands and feet, etc. 　　"Su Wen: The Great Treatise on the Response and Manifestation of Yin and Yang" says: "If Yang prevails, Yin becomes diseased; if Yin prevails, Yang becomes diseased. If Yang prevails, it causes heat; if Yin prevails, it causes cold. Extreme cold leads to heat, and extreme heat leads to cold." 　　If Yang energy is excessive inside the body, Yin must necessarily be damaged; conversely, if Yin is dominant, Yang will be suppressed. Excessive Yang energy produces a heat condition, while extreme Yin energy produces a cold condition. When cold reaches its peak, internal heat arises, and when heat reaches its peak, internal cold arises, which is known as a cold condition. 　　Yin and Yang are not always in opposition, but also depend on each other. For example, the body's functional activities (Yang) must be nourished by nutritional substances (Yin), but at the same time, functional activities also generate nutritional substances, which become necessary for the body, thus maintaining life.