Kidney qi acts on hearing and reproductive organs! The nutrition of the kidney is directly reflected in the hair.

"Opening ears and two yin, its flowers are in hair" comes from Huangdi Neijing.

Huangdi Neijing established the theories of Yin and Yang, five elements, pulse condition, Tibetan image, meridians, etiology, pathogenesis, symptoms, diagnosis, treatment, health preservation, luck and so on.

Discussing medicine with a holistic view presents a "holistic medical model" of nature, biology, psychology and society. Its basic material comes from the long-term observation of life phenomena in ancient China, a lot of clinical practice and simple anatomical knowledge.

Extended data:

"When you begin to understand the ear, it is yin, and its flowers are in hair" comes from the writing process of Huangdi Neijing and Huangdi Neijing.

In the Ming Dynasty, Lang Ying inferred from the legend of Yidi brewing and the evidence that Luo appeared in the Han Dynasty that it was produced in the Western Han Dynasty. The main reason is that Huangdi Neijing has about 200,000 words, which can be said to be a masterpiece more than 2,000 years ago.

Compiling such medical books requires a stable social environment and huge human and material resources, which is impossible in the Warring States period, which was characterized by years of war and seven chivalrous men and eight righteous men. Only in the Western Han Dynasty, with the political stability and economic development, it provided realistic conditions for doctors to compile medical books.

At the beginning of the Western Han Dynasty, Liu An, the king of Huainan, wrote "Huai Nan Zi Xiu Wu Xun": "Secular people respect the past and despise the present, so Taoists must remember Shennong Huangdi before they can speak." The close relationship between Huangdi Neijing and Huanglao School in the title and ideological content also provides evidence that can only be written in the heyday of Huanglao School in the Western Han Dynasty.

Sima Qian in the Western Han Dynasty recorded in the Biography of Historical Records of Cang Gong that there was no Huangdi Neijing among the ten kinds of medical books written by Chunyu Kun, a famous doctor in the early Western Han Dynasty, which proved that Huangdi Neijing could not have been written before the Western Han Dynasty.

From the above point of view, it can be seen that the ancients believed that Huangdi Neijing was written in the Warring States Period. But we can't think that all the chapters in Su Wen and Ling Shu came from the Warring States Period. Lu Fu, a medical scientist at the end of Yuan Dynasty and the beginning of Ming Dynasty, gave a pertinent opinion on this, arguing that Neijing was not a temporary statement or a one-man statement.

The scientific point of view is that Huangdi Neijing was not completed by one author in a short time, but was assembled by several authors for a long time.

Baidu encyclopedia-Huangdi Neijing