Yin and yang deficiency, i.e. yin and yang deficiency, can be judged from the symptomatic manifestations, tongue and pulse, and both yin and yang deficiency can develop and evolve into yin and yang deficiency. 1. Yin deficiency: the deficiency of yin in the body, the body can not control yang, nourishing, moistening and other functions of the decline, the emergence of dry throat, five heart heat (two hands and two feet heart fever, and consciously heart and chest fever), pulse count (pulse becomes narrow and thin and speed up the rate of) as the main manifestations of the deficiency of the heat symptoms. 2. Yang deficiency: refers to the loss of yang qi in the body, the body’s ability to reduce the warmth, transpiration, gasification role of the decline in the cold to cold limbs as the main clinical manifestations of the cold symptoms, the two diseases for a long time, it is easy to become a deficiency of yin and yang. 3. yin and yang deficiency: yin and yang deficiency of the internal organs, to dizziness, fatigue (lack of spirit), cold limbs cold, five heart heat, tongue pale, weak pulse, etc. as the main common symptoms, is the whole body yin and yang deficiency of a series of weak symptoms, mostly due to the long illness, yin and yang loss, or yang and Yin, or yin and yang damage, seen in the late stage of many diseases. Yin and Yang deficiency needs to be recognized by the doctor to judge, reasonable treatment, to avoid misunderstanding the condition.