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.