Yin-Yang Theory and Five Elements Theory are two fundamental principles of Chinese herbal therapy. Yin-Yang Theory is based on the idea that all things in the universe are interconnected and exist in balance. According to Yin-Yang Theory, the body is composed of opposing but complementary forces, such as hot and cold, light and dark, and male and female. When these forces are in balance, the body is healthy, but illness and disease can occur when they are out of balance.
The Five Elements Theory is based on the idea that the body is composed of five elements: wood, fire, earth, metal, and water. Each element corresponds to a particular organ in the body, and each organ is connected to specific emotions and qualities. According to the Five Elements Theory, the body is healthy when the elements are in balance, but illness and disease can occur when they are out of balance.