The seven emotions refer to the human mental activities. In TCM, they are classified into seven classes: joy, anger, melancholy, anxiety, grief, fear and terror.They are the different responses to the environmental stimuli in the human body in general circumstances, they belong to the normal physiological activities and will not cause diseases. When sudden, strong,long or protracted (prolonged)emotional stimuli go beyond the body's adaptability and endurance, the emotional stimuli will become pathogenic factors, which cause dysfunction of qi, blood and the zang-fu organs and imbalance of yin and yang, hence leading to diseases. This is known as "internal injury caused by the seven".

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