Traditional Chinese medicine divides the important internal organs of human body into two categories: viscera and viscera, and the theory about viscera is called "Zangxiang" theory. Zang, tong "dirty", refers to the viscera hidden inside.

1, heart

Heart can control blood vessels, so it is related to blood deficiency and blood stagnation, just like liver. The heart dominates the air, so when the heart is sick, it is easy to forget and lose sleep, resulting in mental disorders.

2. Liver

Liver disease will have the phenomenon of blood deficiency and blood stagnation. Similarly, blood deficiency and blood stagnation will also cause the attack of liver disease. With a strong liver, it is not easy to get sick. On the other hand, if the liver is weak, it is easy to get sick, weak body, easy to catch a cold, sore throat, swollen lymph glands, etc., all caused by abnormal liver function.

Physiological characteristics of five internal organs:

Traditional Chinese medicine takes the difference of physiological function characteristics as the main basis to distinguish viscera from fu-organs. The physiological characteristics of the five zang-organs are metaplasia and storage of essence. For example, Su Wen Wu Zang Bielun said: "The so-called five zang-organs store essence without diarrhea, so they are full but not full."

The physiological characteristics of the five zang-organs are briefly summarized. The so-called "full but not real" and "real but not satisfied" emphasize that the essence of the five zang-organs should be kept full, but it must be circulated and scattered rather than sluggish.

The main physiological function of the heart is to control the blood vessels and store the gods. Because the heart's main blood vessels and functions of storing gods dominate the whole life activities of the human body, it is satisfied as "the official of the monarch", "the foundation of life" and "the great master of the internal organs". The physiological characteristic of the heart is that it is bright for the yang.

The main physiological function of the lung is to control qi to breathe, to move water, to feel the pulse, and to attend the festival. The basic operation form of lung qi is to declare the origin and descend to the depression. The lung occupies the highest position among the five internal organs, covering all the viscera, so it is called "Hua Gai". The lungs are delicate and not resistant to the invasion of cold, heat, dryness and dampness; The lung is connected with the nose and the fur, which is closely related to nature and vulnerable to external evils, so it is called "delicate and dirty".