In Chinese medicine, the Liver is the Yin Organ of Wood. The Gall Bladder is the Yang Organ of Wood. Deficient Wood Yang may be caused by lack of Yang in the Gall Bladder or overactivity of Yin in the Liver. This lack of Yang energy in Wood leads to suppressed rage, sarcasm, cynicism, bitterness and, in general, an inability to get angry. It expresses itself in apathy, sluggishness, resignation and depression.
Wood is the first element of the Chinese elemental cycle and is called the 'young Yang". It manifests in the Liver and Gall Bladder, in the muscles and tendons, in the eyes and one's tears. The emotions ascribed to Wood are produced by the Liver and Gall Bladder: irritability, anger, fury and rage. Wood represents the desire for movement and growth and engages the creative and adventurous spirit.