This Chapter is a dialogue from the Yellow Emperor’s Classic of Internal Medicine, exploring the diagnosis and treatment of illness based on the principles of deficiency (虚, xū) and excess (实, shí). Qi Bo, a renowned physician, explains how these imbalances manifest in the pulse, body, and seasons, offering guidance on differentiating between various conditions of deficiency and excess. The discussion covers a wide range of symptoms and ailments, emphasizing the importance of accurate pulse diagnosis and seasonal considerations for effective treatment. Specific acupuncture and moxibustion techniques are recommended for restoring balance. The text ultimately highlights a holistic approach to healthcare, connecting the internal state of the body to external factors.