Thick, greasy and white tongue coating may be caused by external cold and dampness, or spleen and kidney yang deficiency, or poor diet, indicating that there is dampness and turbidity in the body, which is a heavier and deeper disease; or there is accumulation of food or phlegm in the body (pathological products formed by impaired metabolism of water and fluid). Tongue diagnosis is an important means of diagnosis and identification in Chinese medicine and should be performed by a professional Chinese medicine practitioner. The thickness of the tongue moss represents the degree and location of the disease. Thick moss, which cannot be seen through the tongue moss, represents a more serious condition, which is inside the body; or there is accumulation of food or phlegm in the body. Greasy moss can be seen as delicate tongue coating particles, which are not easy to be scraped off, mostly due to the presence of dampness and phlegm in the body, which stays on the tongue surface, representing phlegm and phlegm, dampness, and accumulation of food (indigestion of food and accumulation of food in the stomach), and so on. If the tongue is white and greasy, it may be caused by cold and dampness, or the spleen and kidneys are unable to run water and fluid due to deficiency of yang, or there is too much cold and raw food in the diet, which leads to dampness and turbidity staying in the body, or phlegm and drink or food accumulation staying in the spleen and stomach and not being able to be transported and transformed. If the tongue is thick and greasy and white with other symptoms, it is recommended to go to the hospital in a timely manner, under the guidance of the doctor to standardize the treatment, do not delay the condition.