Thick and greasy tongue coating is mostly caused by dampness, phlegm (pathological products formed by water metabolism disorders), and food accumulation (food indigestion and accumulation in the stomach). In traditional Chinese medicine, the thinness and thickness of the tongue moss is measured by the standard of “seeing the bottom” and “not seeing the bottom”, and it is not possible to see through the tongue moss to see the tongue texture as thick moss, also known as not seeing the bottom of the moss. Thick moss is usually caused by external evils entering the body, or by phlegm and dietary accumulation. Thick moss is caused by the accumulation of stomach qi and dampness, phlegm, food and other fumigation, stagnation of the tongue, indicating that the disease in the inside. Tongue moss particles are fine and dense, presenting a piece, such as coating with greasy shape, close to the tongue surface, not easy to wipe off, known as greasy moss. The greasy moss is mostly caused by dampness and turbidity contained in the body, Yang energy is curbed, and dampness, phlegm and beverages are gathered on the tongue surface. Thick and greasy moss on the tongue is mostly caused by dampness, phlegm and accumulation of food. If there is any discomfort, please go to the hospital for medical treatment.