Huangdi Neijing said: "The right time, the right place and the right people." The "time" here refers to the four seasons of Yin and Yang, specifically, nourishing Yang in spring and summer and nourishing Yin in autumn and winter. Nourish the lungs and yin, go to bed early and get up early, and be calm, otherwise you will hurt your lungs. Diet and daily life, food, clothing, housing and transportation must also be suitable for the season.

Huangdi Neijing says: We should adjust our spiritual will and secular desires according to the changes of the four seasons. It also emphasizes adjusting breathing, that is, "pranayama" and practicing breathing and breathing.

Its evaluation

Huangdi Neijing has a high position in China medicine, and all successful doctors in later generations attach great importance to it. It has been translated into many languages, such as Japanese, English, German, French, etc., and it has also had a noticeable influence on the development of world medicine. Huangdi Neijing expounds the principles of man and nature, physiology, anatomy, pathology, diagnosis, health preservation and disease prevention and treatment with simple materialistic views and dialectical thoughts.

It has become the cornerstone of China medicine, the source of the theoretical system of traditional Chinese medicine and the basis of clinical diagnosis and treatment. Later generations regard it as a "classic medical book" and a must-read book for studying Chinese medicine. It is an important document for the study of traditional Chinese medicine and a valuable cultural heritage of the Chinese nation. As the theoretical basis and essence of traditional medicine in China, its leading role and contribution in medicine is indispensable in the long history of the prosperity of the Han nationality in the past two thousand years.