Tongue changes can indicate different degrees of changes in the human body, such as purple tongue generally indicates internal stagnation of blood stasis in the body, the purple tongue can be divided into two different situations, one is stagnant tongue, common in young women, which indicates internal stagnation of blood stasis and is related to dysmenorrhea; the second is blue tongue, common in middle-aged and elderly people, which indicates the presence of chronic diseases in the body, related to poor blood circulation and high blood viscosity. Stagnant tongue: It can be seen as purple petechiae or petechiae at the tip or quality of the tongue, which is called blood stasis and qi stagnation in Chinese medicine. It can affect the overall blood flow and can show localized pain if it does not pass. Cyanotic tongue: Mostly seen in the middle-aged and elderly groups with slow blood circulation, the tongue is cyanotic, also seen in people with heart disease, for example: coronary heart disease, pulmonary heart disease, etc. can lead to the appearance of cyanotic tongue. If a cyanotic tongue appears, in addition to taking relevant medications according to the disease, you should also control your diet and avoid the intake of greasy, spicy and stimulating foods. Purple tongue may also be due to insufficient water intake in the body to increase blood viscosity, or suffer from hyperlipidemia to poor blood circulation and other conditions, usually can be compared to the tongue color picture, self-examination of the tongue is purple, such as purple condition indicates the presence of blood stasis in the body, should promptly consult a Chinese medicine doctor for diagnosis and regulation.