Yin and Yang belong to the category of China's ancient philosophy. Through the observation of contradictory phenomena, people gradually raise the concept of contradiction to the category of yin and yang, and explain the movement and change of things with the rise and fall of yin and yang. Traditional Chinese medicine (TCM) uses the concept of the unity of opposites of Yin and Yang to explain the complex relationship between up and down, inside and outside the human body, and the external relationship between human life and nature and society. The relative balance of the unity of opposites of Yin and Yang is the basis for maintaining and ensuring normal human activities. The imbalance and destruction of the unity of opposites of Yin and Yang will lead to the occurrence of human diseases and affect the normal activities of life.
The theory of five elements generalizes the attributes of different things in the objective world with five philosophical categories: wood, fire, earth, gold and water, and uses the dynamic model of five elements to explain the laws of mutual connection and transformation of things. Traditional Chinese medicine mainly uses the theory of five elements to explain the functional relationship between five zang-organs and the mechanism of diseases when zang-fu organs are out of balance, and also to guide the treatment of zang-fu organs diseases.
Luck theory, also known as five movements and six qi, is a theory to study and explore the influence of astronomical, meteorological and climate changes in nature on human health and diseases. The Five Games include wood transportation, fire transportation, earth transportation, gold transportation and water transportation, and refer to the seasonal cycle of spring, summer, autumn and winter in nature. Six qi are six climatic factors: stroke, cold, heat, dampness, dryness and fire all year round. Luck theory is based on astronomical calendar parameters to calculate the annual climate change and disease occurrence law.
Zangxiang theory mainly studies the physiological functions and pathological changes of five internal organs (heart, liver, spleen, lung and kidney), six internal organs (small intestine, large intestine, stomach, bladder, gallbladder and triple energizer) and strange internal organs (brain, marrow, bone, pulse, gallbladder and daughter cells).
Meridian theory is closely related to Tibetan image theory. Meridian is the channel of qi and blood circulation in human body, which has the function of communicating inside and outside and networking the whole body. In pathological state, the function of meridian system changes, which will present corresponding symptoms and signs. Through these manifestations, we can diagnose visceral diseases in vivo.