In the six solar terms in winter, cold is close to the earth, and everything is absorbed, while cold is yin evil, which is easy to hurt kidney yang. Therefore, the six solar terms in winter focus on nourishing essence and storing essence, tonifying kidney and astringing yin. "Su Wen Si Qi Diao Ling" said: "In winter and March, this is called Guan Zang, and water and ice are frozen. If you don't disturb the sun, go to bed early and get up late, you must wait for the sun. If you want to hide your ambition, you have private interests, and you have it. If you drive away the cold, you will be warm. If you don't vent your skin, you will be deprived of your qi. This winter air should be the way to raise Tibet. " It means: three months in winter is a cold season, and everything is closed and frozen. In order to adapt to the characteristics of winter, we should go to bed early and get up late, and get up as soon as the sun shines. Don't disturb the spirit of the sun easily, and keep it hidden. There seems to be a personal secret, which is strictly kept secret, just like hiding something you long for, to avoid the cold and seek warmth. Don't let the skin open and lose, so that the yang will continue to lose. This is the truth of nourishing qi and storing qi suitable for winter weather. This passage emphasizes that in the six solar terms in winter, people should pay attention to the maintenance of their yang from psychological adjustment, diet adjustment, drug adjustment, exercise adjustment and other aspects around the center of "hiding". Otherwise, "if you go against it, you will hurt your kidney, and if you are in spring, you will be faint, and there will be few people alive." That is to say, if the six solar terms in winter do not pay attention to the "way to raise Tibet" and damage the yang in the kidney, it will affect the germinal ability in the next spring, leading to wilting limbs and damaging health.

The six solar terms in winter are the season when the sun's spirit drops, everything sinks and the climate is cold. The ancients said: "Winter is the end, and everything is harvested." At this time, everything is alive, the sun is shining, plants and trees are dying, insects are dormant, the earth is frozen, the ice and snow are cold, and the animals and plants in nature are dormant, saving energy for the next spring. People correspond to the four seasons, and the climate change of natural seasons has a direct or indirect impact on the human body, and the human body will inevitably change with the changes of seasons. This change reflects the adaptability of human physiology, just as "man corresponds to heaven and earth" and "man corresponds to heaven and earth and man corresponds to the sun and moon" in Neijing Lingshu. The physiological function of the human body is also corresponding, and the metabolism is in a relatively slow state. It is called "latent yang", which is conducive to the nourishment and accumulation of essence, so the six solar terms in winter are the best time for health care.