Patients with a deficiency of yin and yang may have a tongue that is fat and tender with little fluid and a pale tongue. Overexertion, late night sleeplessness and prolonged illness may lead to yin and yang deficiencies, and patients usually have a tongue that is fat and tender with little fluids, and there may be a contrast in the tongue appearance. Since patients have both yin and yang deficiency, they may have symptoms of fear of cold and fear of heat, and some of them are also prone to mute voice, lack of energy, lack of mental energy, loose stools, panic, shortness of breath and other symptoms. Patients can follow the doctor’s instructions to take turtle and deer Erxian gum, dihuang drink and other formulas for treatment, which can to a certain extent achieve the effect of yin and yang and tonic. If similar tongue signs or the above symptoms occur, it is recommended that the patient should consult the hospital in time to determine whether there is a deficiency of yin and yang, and use medication under the guidance of the physician.