In Chinese medicine, yin and yang deficiency (deficiency of yin and yang qi in the body) can be judged from the clinical symptoms, tongue and pulse, etc. Generally, the clinical symptoms include lack of energy, dizziness, tinnitus, insomnia, and dreaming, etc. On the tongue and pulse, yin and yang deficiency is characterized by a pale tongue that lacks fluids or has teeth marks, and the pulse is generally fine and counted. Men may experience impotence and spermatorrhea, and women may experience irregular menstruation and dysmenorrhea. On the tongue and pulse, the tongue of yin and yang deficiency is pale and lacks fluid, or has teeth marks, or flaking moss (tongue moss characterized by flaking), and the tongue is fat and tender, or thin and thin. The pulse is usually fine and numb. Patients with deficiency of yin and yang can take Di Huang Drink, which is composed of Chinese herbs such as Di Huang, Cornus officinalis, Morinda citrifolia and Cistanche, and has the efficacy of nourishing kidney yin, tonifying kidney yang and opening the orifices and resolving phlegm (resolving phlegm evils in order to open up the orifices of the brain), with attention paid to the fact that patients who have hyperactivity of liver yang (hyperactivity of the liver meridian’s fire-heat evils) and obvious signs of heat are unsuitable for taking the medicine. In addition, deficiency of yin and yang is common in the later stages of many diseases. If the patient has a deficiency of both yin and yang, it is recommended to seek medical advice in a timely manner and take the medication correctly under the guidance of a doctor, do not self-medicate to avoid any adverse reactions.