Deficiency fire refers to the phenomenon of fire caused by the deficiency of yin. The human body is divided into qi, blood, yin and yang. When yin is deficient, it is very easy to develop fire, such as dry and sore throat, red cheeks, irritability, poor sleep, red tongue with little coating and thin pulse. Deficiency fire is a very common problem in Chinese medicine. Consider drinking more water appropriately, and pay attention to going to bed early to increase the body’s immunity, and pay attention to proper supplementation of B vitamins. If necessary, you can use some fire-clearing medicines, such as Scutellaria baicalensis, Huang Lian and Huang Bai.