Thick tongue coating in Chinese medicine usually suggests internal evidence, phlegm and dampness, food accumulation (food indigestion and accumulation in the stomach), etc., need to be based on the specific situation, choose the appropriate treatment. 1. Li-evidence: relative to the surface evidence, mostly refers to the invasion of external evil, into the body, not limited to the skin, or body internal injuries sick, deeper, heavier, if the yellow thick, usually real heat, it is desirable to clear the heat and drain the lower; if white thick, usually real cold, it is desirable to warm and dissipate the cold (warming the spleen and stomach to dispel the cold medicine). 2. Excessive phlegm-dampness: the spleen likes dryness and hates dampness, if phlegm-dampness is abundant in the body, the normal transportation of the spleen will be obstructed, which will lead to the difficulty of descending the turbid qi in the stomach, and then upwardly reversed to the tongue, resulting in a thick tongue coating, which generally requires strengthening the spleen and drying dampness (strengthening the spleen and eliminating the evil of dampness) to resolve phlegm. 3. Food stagnation (poor digestion of food and its accumulation in the stomach): Mostly due to overeating and drinking, food is accumulated in the middle Jiao, and under the action of stomach fire, turbid qi vaporizes and overflows upward, resulting in thick tongue coating, which usually needs to be eliminated to promote digestion of food. All of the above drugs should be used under the guidance of a doctor and according to the specific condition after the identification of the evidence, do not use on your own.