Hello, kidney yin deficiency, manifested as dry mouth, itchy skin, insomnia and dreaminess, irritability, backache and knee weakness, fever in hands and feet, tinnitus and dizziness. Generally speaking, most people with kidney-yin deficiency are red in the face and five are upset and hot. Drugs for tonifying kidney yin deficiency are mostly sweet and cold drugs, such as Dendrobium, Polygonatum odoratum, Cornus officinalis, Lycium barbarum and American ginseng. The representative of Chinese patent medicine is Liuwei Dihuang Pill.