Disease analysis: nourishing yin, a Chinese medicine term, refers to a therapy of nourishing yin liquid. Commonly used drugs such as Radix Adenophorae, Rhizoma Polygonati Odorati, Radix Asparagi, Herba Dendrobii, Fructus Lycii, etc. Nourishing yin also refers to nourishing yin, nourishing yin and benefiting yin. It is a method for treating yin deficiency syndrome. Symptoms include emaciation, dizziness, tinnitus, red lips and cheekbones, insomnia, hot flashes and night sweats, cough and hemoptysis, nocturnal emission, red tongue with little fur and rapid pulse. Common prescriptions such as Liuwei Dihuang Pill, Zuogui Pill and Buyin Pill. Commonly used drugs such as Radix Asparagi, Radix Ophiopogonis, Herba Dendrobii, Radix Adenophorae, Rhizoma Polygonati Odorati, Carapax et Plastrum Testudinis, Carapax Trionycis, Eclipta prostrata, Fructus Ligustri Lucidi, etc.