The human body is a multi-layered network structure and networked with heaven and earth. There are layers of diseases, the most superficial layer is the pain that people can feel, a superficial phenomenon that misleads people’s thinking; the next level of disease is not felt by people, but can be detected with the help of some advanced instruments; the next level of disease is invisible, and any advanced instruments nowadays are useless because this level of disease exists in the The next level of the disease is invisible, which is useless for any advanced instruments nowadays, because this level of the disease exists in the “underworld” and is impossible to be found physically. For example, if someone coughs up blood and a CT examination reveals lung cancer, then “coughing up blood” and other symptoms are the surface level of the disease, and CT examination reveals lung cancer is the next level of the disease, and at the next level, it cannot be detected because it exists in the dark, so we can only rely on intention. The essence of the problem is hidden or even invisible, and to solve the problem and treat the disease, we must see the essence of the problem. The “root” of the disease is the deep-seated cause of human morbidity, for thousands of years, medical doctors have been exploring the “root” of human diseases, in fact, the “root” of the disease has long been realized by the ancients, that is, “hidden in the yin, and like in the yang”, which is a very wise Assertion, whether it is nature, society, or the human body, bad things are definitely and necessarily hidden in the dark places, and what is revealed in the sun and felt is often not the “body” of the problem, my clinical research shows that: most of the causes of internal diseases all point to the dark parts of the body, such as: the abdomen, inner thighs and armpits. The problems seen and felt in the clinic are actually just the shadow of the disease “like in Yang”, just like you see yourself in the mirror.