The emotional changes of the human being are normal responses to stimulation of the brain mean the outside world. TCM believes that the emotional activity is also closely linked to liver function in the dominant driving and dispersion, which in this case is governed by the heart. If the liver function is normal, activity of qi is good, happy emotions, the mind at ease, the qi and blood harmonious, and the five Zang viscera-of coordination. Conversely, if it is not, the functional activity of qi is unbalanced. Abnormality of mental health and emotional work in May of the following two aspects: First, when the liver function and in the conduct of the dispersion is weak, there is a stagnation of the functional activity of qi in the body. At the same time, this is accompanied by symptoms such as emotional depression, sadness, moodiness, excessive worry, belching, sighing sentimenital, etc. This is called the "stagnation of liver qi." Then hyperactivity of the liver m driving and dispersion causes emotional arousal, and symptoms such as headache with sensations of distention in the head, face puffy, irascibility, frustration, agitation, difficulty of sleep, etc. These are called "hyperactivity of liver-fire." Furthermore, the function of liver in regulating emotional activities is closely linked to the liver storage of blood. This is also known as "the liver stores the blood , which houses the etherial soul. "When the liver, blood is ample, and the liver of the body adequately nourished, its function of driving and the dispersion is normal. The liver has the capacity to regulate emotional activity. If the blood of the liver is altered, the function is abnormal, excessive and disturbing the sleep of dreams, we will be afraid, the result sleeplessness May, and1 sleepwalking occur in May
Liver failure in the dominant conduction and dispersion of activity can lead to emotional activity as well. The stimulation of the seven emotional factors, in particular, anger, or persistent and repeated noxious stimuli may lead to pathological changes of the stagnation of liver-qi, or qi stagnation and blood stasis. That is why it is said in traditional Chinese medicine that "The liver promotes a smooth flow of qi and an aversion to stagnation and excessive anger, hurts the liver."