There are both yin deficiency and yang deficiency, which are called yin-yang deficiency, and the main manifestations are as follows; Fear of cold and heat, especially cold in winter and hot in summer, is a constitution of imbalance of yin and yang or deficiency of both yin and yang. Tonifying yin and yang, nourishing yin and strengthening yang should be adopted.

Guifu Dihuang Pill [Indications] Warming and tonifying kidney yang. Used for deficiency of kidney yang, soreness and coldness of waist and knees, unfavorable or excessive urination, phlegm retention, cough and asthma. The syndrome of this product is kidney-yang deficiency, which is caused by kidney-yang deficiency, so warming and tonifying kidney-yang is the main method. Based on Liuwei Dihuang Pill, the whole prescription nourishes the yin of liver and kidney, supplemented by cinnamon and aconite to warm and tonify kidney yang, so as to achieve the purpose of "benefiting the source of fire and eliminating the stagnation of yin". The combination of various drugs can not only tonify kidney yin, but also tonify kidney yang, and yin and yang coexist. As Zhang Jingyue said, "Those who are good at nourishing Yang will seek Yang in the yin, and Yang will be helped by Yin, which is endless in biochemistry". It is very suitable for diseases caused by kidney yang deficiency.