Dihuang is a traditional Chinese medicine with no significant gender difference in its efficacy and action. The drug source of Dihuang is the fresh or dried tuberous root of Dihuang, a plant of the Genusaceae family, the former known as fresh Dihuang and the latter known as raw Dihuang. 1. Raw Dihuang has the efficacy of clearing heat and cooling the blood, nourishing yin and generating body fluid, and can be used in the treatment of cases of heat entering the camp and blood (the degree of invasion of heat into the human body is deep and the symptoms are more severe), vomiting and epistaxis, as well as cases of heat diseases that injure the yin and constipation due to injury of the body fluid. 2. Radix Rehmanniae Praeparata is a concocted processed product of Radix Rehmanniae Praeparata, its efficacy and action are different from that of Radix Rehmanniae Praeparata, which has the efficacy of tonifying blood, nourishing yin and benefiting essence to fill in the marrow. It can be used in the treatment of blood deficiency, yin deficiency of the liver and kidneys (deficiency of yin in the liver and kidneys), dizziness, tinnitus, lumbar and knee soreness (a feeling of soreness and weakness in the lumbar and knee regions), bone vapor and tidal fever (a burst of heat, feeling that the heat is penetrating from inside the bones to the outside), night sweating (abnormal sweating after going to sleep, but the sweating stops when waking up), and spermatorrhea, and other conditions. It should be noted that the raw dihuang is cold, so spleen deficiency and dampness, abdominal fullness and loose stools (feces thin and not shaped) should not be used, the specific use of the physician’s diagnosis should also be carried out under the guidance of the doctor, do not recommend blindly using their own Chinese herbs.