The blood is like a river in the human body, and its temperature requirements are very high. When the temperature is too low, the river will freeze; if the temperature is too high, the water will evaporate. Therefore, Chinese medicine practitioners say that "the blood is warm, but not the heat". It can be seen that the words used in the "Yellow Emperor's Internal Classic" are very precise.

Cold and heat is a relatively basic concept in Chinese medicine. The body temperature is constant, generally at 36 to 37.4 ° C, and more than 37.5 ° C is fever. Human body function will be affected by too high a temperature.

According to the "Question of the Question": "The warmth of the human body, the yang is also." The liquid substances such as the body's blood, blood and body fluids also need to rely on the warmth of the gas to maintain normal circulation. If the warming effect of the gas is reduced, the blood and body fluid will stagnate.

 If the cold evil invades the human body, the meridians and tendons will contract with it. This is the reason why people feel numb in cold weather. If the cold evil enters the blood, the blood will stagnate and the meridians will be blocked. "If you don't understand it, you will feel pain in some part of the body." For example, knee pain, people often do hot compress in this area, when the pain will ease or disappear, because the high temperature makes the stagnant blood flow again.

Since the cold is not good, how about the heat? It's not good either. Heat is Yang evil, which consumes Yin and Jin of human body. Yinjin is like water in a pot. It evaporates very slowly. If you keep heating it, it will evaporate quickly. Like those who have a cold and fever, they often have dry mouth and tongue. That's why. Qi is attached to the body fluid. A small amount of body fluid is equivalent to less vehicles carrying gas. People will have some symptoms of Qi deficiency, such as laziness, fatigue and so on. This is what Chinese medicine calls "strengthening fire and eating qi". Qi can absorb blood, because of the solid absorption of Qi, blood can honestly move along the vein. Qi deficiency, blood control will decline, coupled with high temperature, accelerated blood flow, Chinese medicine called "blood heat arrogance", the human body will appear some bleeding symptoms, such as gingival bleeding, subcutaneous bleeding, menorrhagia and so on.

The most appropriate state is temperature. In fact, the human body has the function of regulating, it will control the temperature itself, and this role is Yang Qi.

Yang Qi is like the sun of the human body. With it, the viscera and muscles can be warm and the body function can be normal. In the normal state, "Yang" is more than "Yin", because people need fire to live. The relationship between Yang Qi and kidney is the closest. Kidney Yang is the basis of a body of Yang Qi. "Yang Qi of the five Zang-organs can not be produced by this". Many people in life have cold hands and feet, and cold knees, which we call Kidney Yang deficiency. What to do at this time? You can soak your feet in hot water to make your body sweat slightly so that you can speed up the circulation of blood and gas.

"Yang Qi, if the sky and the sun, lose their place will lose their lives but not reveal themselves", so we should protect the body of this round of the sun, so that the human body can flourish and maintain health forever!