Da Tian Yin Wan is a proprietary Chinese medicine with the effect of nourishing yin and lowering fire (nourishing yin essence and lowering fire), which can be used for the treatment of breast development with hard lumps caused by precocious puberty in girls with yin deficiency and hyperactivity (deficiency of yin and essence in the body and hyperactivity of deficiency fire). How long it takes for the lumps to subside depends on the individual’s condition and the degree of illness, and should be used according to medical advice. The clinical manifestations of Yin deficiency and fire type precocious puberty include: early breast development, increased vaginal discharge, labia development, hyperpigmentation, and menstruation in girls. Accompanied by five heart-heat (heat in the hearts of the hands and feet, and self-consciousness of heart and chest heat), hot flashes (bursts of heat), fear of heat, zygomatic redness (cheeks and cheekbones reddish in color), night sweating, irritability, dryness of the throat and mouth, short and yellowish urine, dry and knotty stools, reddish-red tongue with little or no moss, and a thin and countless pulse (the pulse becomes narrower and finer, and its rate is accelerated), and so on. The drug composition of Da Tian Yin Wan includes Radix Rehmanniae Praeparata, Radix Phellodendron Bidentatae, Rhizoma Ziziphi and so on. Clinically, it is mainly used for the treatment of hot flashes, cough, tinnitus, night sweating, spermatorrhea and other conditions caused by yin deficiency and fire exuberance. Adverse reactions and contraindications are not clear. Cold and fever and allergic to the composition of the drug Dazhongyin Pills patients are prohibited to take. Pregnant women and allergic individuals should be cautious. Patients with hypertension, heart disease, kidney disease and other chronic diseases need to follow the doctor’s instructions to take medication. During the medication, avoid eating spicy, cold and greasy food. If there is a hard lump in the breast, patients need to consult the hospital in time, and strictly prohibit self-medication to avoid delaying the condition.