If the tongue is thin, white and moist, it may be normal. Pathological white tongue coating is usually found in superficial syndrome, cold syndrome, dampness syndrome, and also in heat syndrome, which can be treated with medicines such as Lizhong Pill and Pingtong San. If the tongue coating is thin and white and moist, it can be a normal tongue, usually without treatment. It can also be caused by external wind-cold, and can be treated by taking Gui Zhi Tang and other prescriptions. Or it can be caused by Yang deficiency and internal cold, and can be treated by taking medicines such as Lizhong Pill. If the tongue coating is white and greasy, it is mostly due to internal stagnation of dampness and turbidity, or phlegm (a pathological product formed by impaired metabolism of water and fluid), or accumulation of food (food that is indigested and stagnates in the stomach). It can be treated with prescriptions such as Ping Stomach San and Wu Ling San. Patients with white tongue need to be judged by a professional doctor and then take medication under the doctor’s guidance, do not use medication on your own, so as not to cause adverse consequences.