This Chapter is a dialogue from the Yellow Emperor’s Classic of Internal Medicine, exploring the interplay between Yin and Yang energies in the body, particularly concerning the Spleen and Stomach. Qi Bo, explaining to the Yellow Emperor, details how imbalances in these energies manifest differently depending on their location (internal/external) and affect specific organs and bodily functions. The discussion also addresses the Spleen’s role in nourishing the limbs and its relationship with the Stomach, clarifying why it doesn't govern a single season despite its central importance. The text highlights the interconnectedness of organs and energy pathways within Traditional Chinese Medicine.