In Traditional Chinese Medicine (TCM), tongue diagnosis is one of the key methods for assessing overall health. By observing the color, shape, and coating of the tongue, practitioners can gain insights into internal imbalances and disease patterns. A crucial aspect of TCM tongue diagnosis is “looking at the coating color,” which refers to the color of the tongue coating. The color of the coating can reflect different pathological conditions in the body. The primary coating colors observed are white, yellow, gray, and black—these are common indicators used in TCM to understand a person’s health. Table of Contents 一. White Coating When the tongue coating appears white, it is referred to as “white coating.” In Traditional Chinese Medicine (TCM) tongue diagnosis, white coating can vary in thickness, and is commonly associated with exterior or cold conditions. It is frequently observed in conditions like wind-cold or wind-damp invasion, as well as yang…