The physiological function of Qi, pathogenesis and evidence-based treatment Qi is the power source of human life activities, and is the product of the functional activities of the internal organs, the physiological phenomena of the internal organs, pathological changes are important material basis of Qi. First, the physiological function of gas 1.Promote the role: refers to the gas has the role of stimulating and promoting. Gas is a strong vitality of fine material, can stimulate and promote the growth and development of the human body; improve the physiological functions of the organs and meridians and other tissues and organs, can promote the generation, distribution and excretion of blood. When the driving effect of qi is weakened, it can affect the growth and development of the human body or cause premature aging. It can also cause the physiological functions of the organs and meridians and other tissues and organs to diminish, resulting in pathological changes such as insufficient production of blood and fluid, delayed movement, and obstruction of transmission and excretion. Yang Ming, Department of Traditional Chinese Medicine, Henan Provincial People’s Hospital 2. warming effect: refers to the role of Yang Qi in generating heat and warming the body. This function of qi has an important physiological significance in the human body. The body temperature needs to be maintained by the warming effect of qi; the physiological functions of various organs and meridians need to be carried out under the warming effect of qi; blood can be warmed and traveled, qi can be transformed into water, blood and fluid and other liquid substances, all need to be warmed by qi in order to be normal. The blood can be warmed to move, the blood can be transformed into water, blood and fluids and other liquid substances, all need to be warmed by Qi in order to circulate normally. The Qi that warms the body is the Yang Qi of the human body, which is transformed into heat, so the more Yang Qi there is, the more heat there is, and the less Yang Qi there is, the less heat there is, which is why there is “excess Qi is fire” and “insufficient Qi is cold”. 3. The defensive role of qi: qi has the role of protecting the skin and defending against evil qi. On the one hand, it can defend against the invasion of external evil, and on the other hand, it can drive evil out. Therefore, when the defense function of qi is normal, it is not easy for evil to invade, or even if it does, it is not easy to develop, and even if it does, it is easy to cure. When the defensive function of Qi is weakened, the body’s ability to resist evil will be reduced, and on the one hand, the body will be prone to diseases, and on the other hand, it will be difficult to heal from diseases. Therefore, the defensive function of qi is closely related to the occurrence and development of diseases. 4. The role of consolidation: Qi has the role of consolidation and control of liquid substances in the body, so that they are not lost for no reason. The performance of the following three aspects: (1) fixation of blood, to prevent blood overflow outside the vein, to ensure that the blood in the normal circulation of the vein. (2) To fix the body fluids: urine, saliva, gastric fluid, intestinal fluid, etc., and control their secretion and excretion to prevent loss of body fluids; (3) to fix the semen and prevent delusional discharge. Weakness of Qi fixation can lead to a large loss of fluid in the body, such as: Qi does not take in blood, which can lead to various kinds of bleeding; Qi does not take in fluid, which can lead to spontaneous sweating, polyuria, urinary incontinence, salivation, vomiting clear water, slippage under the discharge; Qi does not fix essence, which can lead to seminal emission, slippage, premature ejaculation; Qi deficiency and Chong Ren is not fixed, which can lead to miscarriage, slippage, etc. 5. qi-chemistry: the so-called qi-chemistry refers to the various changes produced by the movement of qi. That is: the metabolism and mutual transformation of essence, qi, blood and fluids. In fact, the process of gasification is the process of metabolism. Qi is the material basis for maintaining life activities. This living material is often in the process of metabolism, which is constantly renewing itself and reproducing itself, and this movement of qi is called “qihua”. If the function of qi-chemistry is not normal, it can affect the whole process of material metabolism, such as affecting the digestion and absorption of food, the production and distribution of qi, blood and fluid, the excretion of sweat, urine and feces, etc., thus forming various abnormal metabolic pathologies. 6. Nutritional effect: It mainly refers to the effect of water and grain essence gas produced by the spleen and stomach through transportation of food. This qi is combined with fluid to become blood, which is transported to the whole body through the veins and tubes to play a nutritional role, so it is called Ying qi. This Qi can be coalesced to form the internal organs and meridians of the body and various organs. It can also be consumed to produce the power needed for human life activities. Qi deficiency: mainly due to dietary disorders, water and grain essence is not complete so that the source of gas is not enough, or due to serious illness, old age and frailty and overwork, resulting in the weakening of the internal organs. Insufficient production of Qi. Due to the deficiency of vital energy, it cannot play its role of promoting, fixing, warming, and defending the outside of the body, and it manifests a series of symptoms, such as mental atrophy, tiredness, and weakness of the limbs. This evidence is characterized by a series of symptoms of the internal organs decompensation, with the onset of different internal organs, the focus of symptoms are different. 2. Qi depression: caused by internal injury of emotion and will, liver qi stagnation, gas is not smooth and manifests mental depression, emotional restlessness, chest distension, abdominal pain in the ribs, pain without a fixed location, stuffy belching, not thinking about eating and drinking, irregular bowel movements, thin and greasy moss, string pulse, etc.. The degree of severity of this evidence is often closely related to whether the mood is relaxed or not. 3. Stagnation of qi: emotional discomfort, dietary imbalance, feeling external evil, flash and fall, as well as phlegm and blood stasis can lead to stagnation of qi. As a result of Qi stagnation, Qi and blood flow obstruction, resulting in swelling and fullness, pain, thin and greasy coating, and stringiness of pulse in the internal organs or the corresponding parts. 4. Qi rebellion: mostly caused by internal injury of emotion and will, poor diet, cold and temperature discomfort or phlegm congestion. The headache, head swelling, redness of the face and eyes, irritability, etc. occur due to the rebellion of liver qi. Since liver is a rigid organ and a blood-containing organ, the rebellion of liver qi may cause blood to follow the rebellion of qi, resulting in hemoptysis, vomiting of blood or fainting due to congestion of clear orifices. The dialectical treatment of qi 1. treats the nature of qi lesions, replenishes its deficiencies and corrects its abnormal operation, such as qi deficiency should be supplemented with qi and benefit qi, and can be used to supplement Zhong Yi Qi Pills (soup), Gui Shen Wan, Si Jun Zi Tang, X Quan Da Teng Tang, Ginseng Qi Tablets, Ginseng Qi Fu Zheng Injection, Ginseng Mai Injection, etc. For qi stagnation, it is advisable to regulate and relieve qi stagnation: Mu Xiang Shun Qi Wan, Yi Yao Wan, Xie Yu Wan, Han Xia Hou Pu Tang, Gan Mai Da Zao Tang, etc. For Qi stagnation, it is recommended to regulate and tonify the Qi, which can be used as Sichibei San, Chaihu Shuhepian San, Wumao Tang, Da Chaihu Tang, etc. For Qi rebellion, it is advisable to smooth the Qi and lower the rebellion: Gentian Diarrhea Liver Pill (Tang), Liver Resting Wind Soup, Tianma Hooked Vine Soup, Ding Xiang Persimmon Tip Soup, Shen Xiang Descending Qi Dispersion, Su Zi Descending Qi Soup, Tian Ma Su Injection, etc.