This Chapter is a dialogue from the Yellow Emperor's Classic of Internal Medicine, exploring the concept of jue, or reversal syndromes. The discussion centers on the differentiation between cold and heat reversals, their causes stemming from imbalances of yin and yang qi, and their manifestations in various meridians of the body. Specific symptoms and treatments are detailed for each meridian, highlighting the importance of diagnosing the underlying imbalance for effective treatment. The text emphasizes the internal origin of these disorders, contrasting them with externally caused illnesses. Finally, it underscores the potentially severe consequences of untreated imbalances, particularly in the case of simultaneous yin meridian reversals.