This Chapter is a dialogue from the Yellow Emperor's Classic of Internal Medicine, specifically The Spiritual Pivot, exploring the causes and treatments of various conditions related to blood vessels (xuè luò). The dialogue between the Yellow Emperor and Qí Bó examines the different presentations of blood vessel disorders, such as collapsing after acupuncture or the appearance of the blood itself. Qí Bó details the underlying imbalances of qi and yin/yang that cause these varied symptoms, offering explanations based on the body's energetic flow. Finally, the text provides guidance on identifying these conditions through physical examination and adjusting acupuncture techniques accordingly.