What fundamental theory explains the balance of Yin and Yang?

Yin-Yang Theory serves as the core framework in Traditional Chinese Medicine (TCM) to understand the balance and interaction of opposing forces in the universe and the human body. It describes how Yin (representing qualities like darkness, coolness, and receptivity) and Yang (associated with light, warmth, and activity) are interconnected and constantly influencing each other.

The theory posits that health results from a dynamic equilibrium between Yin and Yang. When these forces are balanced, the body is in harmony, which is crucial for maintaining physical and emotional well-being. Conversely, an imbalance can lead to various pathologies, as excess or deficiency in either aspect creates disharmony.

Five Elements Theory, while also integral to TCM, primarily describes the relationships between the five elements (Wood, Fire, Earth, Metal, Water) and their influence on health and disease rather than the fundamental interaction of Yin and Yang. Meridian Theory focuses on the pathways for Qi (vital energy) in the body, and Harmonization Theory relates to approaches for treating specific imbalances but does not serve as the primary explanation for the Yin and Yang balance itself. Thus, Yin-Yang Theory is the fundamental concept that directly addresses the balance between these two essential elements.