This Chapter from the Yellow Emperor's Classic of Internal Medicine discusses the relationships between blood and qi in the body, detailing their distribution across different meridians. It explains how to locate specific acupuncture points on the back and how to treat illnesses based on the interplay between physical form and emotional state, categorizing these into five distinct patterns. Finally, it provides guidelines on needling techniques to release either blood or qi depending on the specific meridian and imbalance. The text emphasizes the importance of balancing internal forces to restore harmony and health.