Chinese medicine believes that the heart has two main functions. One is "the heart governs the blood vessels", which means that the heart has the physiological function of promoting the blood to run in the meridians, so that the blood can run all over the body to nourish various organs and tissues, which is basically the same as that of western medicine. The second is "the mind governs the gods", that is, the mind is closely related to spiritual thinking activities. If the brain dominates the normal function of the brain, it will be energetic, clear-headed and quick-thinking. On the other hand, if the function of the mind governing the gods is abnormal, there may be symptoms such as insomnia, dreaminess, irritability, slow response and forgetfulness. What's more, there will be mental disorders, delirium, and even coma and unconsciousness. Chinese medicine also believes that "the heart knows the tongue from the beginning" and "the tongue is the seedling of the heart", that is to say, the relationship between the heart and the tongue is close, and the situation of the heart can be shown from the color and shape of the tongue, such as the normal function of the heart, the ruddy and soft tongue, flexible movements, sensitive taste and fluent language. If the heart is deficient in qi and blood, the tongue is tender; If there is congestion in the heart, the tongue will be dark purple, and in severe cases, there will be congestion; When the heart is hot, the tip of the tongue is red or sore. Therefore, the main principle of heart health care method should be to ensure the normal function of the main blood vessels and the main mind of the heart.