The Yellow Emperor's Classic of Internal Medicine, specifically Chapter 18, explains how to assess a person's health by examining their pulse. The text details the characteristics of a healthy pulse and how variations in pulse rate, rhythm, and quality correlate with different illnesses and imbalances in the body's organs. Specific pulse patterns are linked to the seasons and elemental forces, offering insights into the nature and severity of ailments. The text emphasizes the importance of the stomach's qi as fundamental to overall health, and explains how an understanding of pulse diagnostics can aid in diagnosis and treatment. Finally, it describes how certain pulse characteristics can predict the likelihood of a successful recovery.