Tongue diagnosis is a unique diagnostic method in Chinese medicine, through which a certain degree of judgment on health can be made. Normal tongue is soft, flexible, reddish and white. Only by understanding the normal tongue image, can we judge the abnormal tongue image, as far as the tongue quality is concerned, the following kinds are common: 1. pale white tongue: pale white tongue is lighter than the normal tongue color, the tongue is mostly related to the lack of yang, mostly seen in the deficiency, cold, qi and blood deficiency. 2. Red tongue: red tongue is darker than normal tongue color, the main identification for heat, according to the different physique can be divided into solid heat and false heat. The red and dry tongue is mostly for solid heat syndrome, and the red and mossless tongue is mostly for deficiency heat syndrome. 3. Purple tongue: Purple tongue is mostly identified as heat and injury to fluid or cold and blood stasis. The majority of the purple tongue is dry and hot, and the majority of the purple tongue is wet and cold, and the majority of the tongue is wet and cold. There are many other elements of tongue identification, it is best to combine with the pulse to make a comprehensive judgment, if necessary, it is recommended to go to a regular hospital, under the guidance of a professional physician identification and diagnosis.