The reason for the white, greasy and thick tongue coating is mostly dampness and turbidity, or phlegm and drink (pathological products formed by water metabolism disorders), food accumulation (food indigestion and accumulation in the stomach). 1. Dampness and turbidity internal stagnation: for the spleen and kidney exhaustion, qi unfavorable, dampness and poisonous evils within the San Jiao caused by the disease, in addition to the symptoms of white greasy thick tongue, usually accompanied by a small amount of urine, color clear, or even urinary closure, dark complexion, fatigue (mental fatigue, physical fatigue), and other symptoms. 2. Phlegm: It refers to the unfavorable transportation of water and fluid in the body, which accumulates in certain parts of the body, mostly caused by external cold and dampness, improper diet, and physical weakness due to exertion, etc. It is often characterized by the symptom of white and greasy tongue coating, coughing up phlegm, phlegm sounding in the throat, and tightness in the chest. 3. Food accumulation: for the spleen transport failure caused by the spleen and stomach disease, often do not think of milk food, abdominal distension, belching rot, sour stools, constipation and other symptoms, there will also be the performance of the tongue coating white greasy thick. Chinese medicine emphasizes evidence-based treatment, if the symptoms of white greasy thick tongue, you should consult a doctor in a timely manner, under the guidance of the doctor’s evidence-based treatment, do not blindly use drugs.