Du meridian and Ren meridian are both manifestations of ancient doctors' understanding of the human body. More than 2000 years ago, during the Spring and Autumn Period and the Warring States Period, the theory of Ren Du Er Mai was established. In Huangdi Neijing, "Ren Du Er Mai" is mentioned in many places. To be exact, first of all, Du meridian is people's understanding of the spine, while Ren meridian is the understanding of some physiological changes of women after pregnancy, and finally it is gradually deduced to men. For example, why do men have beards and women don't? Ancient doctors used the differences between men and women to explain.

"Du meridian" includes two sides besides the middle. For example, the word "Du meridian" also implies the meaning of "Du meridian", that is, standing in the middle and looking at both sides. Ancient physicians regarded the "Du Meridian" spine as the most important tissue and organ, which had specific connotations. A long time ago, the ancients only realized the role of' Du Meridian'. For example, if there is a problem in the middle of the Du meridian, the spine will be painful and uncomfortable, and if there is a problem at the lower end of the Du meridian, it will lead to abnormal urination. Abnormal upper end of Du meridian can cause headache and dizziness. These symptoms are related to the abnormal function or structure of the spine and its surrounding muscles, nerves, blood vessels and other tissues.

"Renmai" was originally the word "pregnancy", which means that after a woman is pregnant, there will be pigmentation in the anterior midline of the human body, not only because of pregnancy, but also because of the change of menstrual cycle. At that time, the ancients observed this subtle change very carefully. In ancient clinical accumulation, it was gradually theorized and "Ren Mai" was constructed.