When the yin and yang of the human body are in a state of imbalance, which is often referred to as yin and yang imbalance, when yin and yang imbalance will give rise to a hundred diseases. When Yin is cold and Yang is hot, when Yin is weak and cannot control the rise of Yang, Yang is relatively hyperactive, then the body will show symptoms of Yin deficiency and internal heat, and Yin deficiency and hyperactivity. To put it simply, Yin deficiency is actually the deficiency of fluid, blood and water in the body, and the relative fire and thus the deficiency of heat. Heart fire, liver fire or stomach fire can be one of the reasons for the formation of Yin deficiency fire. In addition, if Yin is deficient and unable to control Yang, a state of deficiency heat will develop in the body in which Yang is prevalent. The so-called Yin deficiency generates internal heat, as mentioned in Chinese medicine, over 40 years old, Yin Qi since half, these symptoms are related to aging or excessive intercourse. Yin deficiency and fire will often cause dizziness, dizziness, lumbar soreness and leg weakness, irritability, heat in the five hearts, loss of weight, hot flashes and night sweats, dry mouth and sore throat, seminal emission and premature ejaculation. Therefore, patients diagnosed with yin deficiency and fire must be actively treated, and can take Zhi Bai Di Huang Wan or Liu Wei Di Huang Wan to regulate, or follow medical advice. At the same time, the diet should be light and nutritionally balanced. Pay attention to rest and avoid excessive exertion.