Entering Huangdi Neijing is an online medical course. Huangdi Neijing is a comprehensive medical work. Based on the theory of Huang, he founded the theories of Yin and Yang, Five Elements, Pulse, Zangxiang, Meridian, Etiology and Pathogenesis, Symptoms, Diagnosis, Treatment, Health Preservation, Luck and so on, and discussed medicine from the viewpoint of holism, presenting a holistic medical model of nature, biology, psychology and society.