Heart yang refers to the yang qi of the heart. Opposite to heart yin, it is active, promoting and warming. Heart yang primarily warms and nourishes; it also stimulates the physiological activity of the heart, and also restricts heart yin to prevent internal coldness in excess. This ensures the normal activities of human body. In terms of physiological functions, the heart governs the blood and vessels and stores the spirit, in both of which heart yang plays a vital role. On the one hand, heart yang and heart qi propels the regular blood circulation. On the other hand, heart yang warms and nourishes to ensure the smooth flow of blood. In terms of mental activities, spirit requires the nourishing of heart blood and heart yin. Moreover, the warming and stimulating of heart yang enables one to raise one’s spirits, gaining vitality and wellbeing.