The coating appearing on the surface of the tongue reflects the energy transformation in the human body.
The thickness of the coating is a reflection of energy or steam changes in the spatial body. It is determined by whether the tongue body can be seen through the coating. If so, the coating is light and thin. Otherwise, it is thick. Normally, the tongue coating should be light and white, or a bit thick in the middle and at the root. In clinical practice, a thick and sticky coating on the root of the tongue is commonly observed. It represents stagnation in the energy from the Ming Men (GV4) to the coccyx area, as well as the driving force of the Hui Yin (CV1) area.