Reed Root is the fresh or dried rhizome of Reed, family Gramineae. Root is the fresh or dried rhizome of Reed, family Gramineae. It has the effects of clearing away heat and fire (removing heat and fire from the body), generating fluids and quenching thirst (promoting the production of fluids to quench thirst), removing vexation, stopping vomiting, and inducing diuresis, which can be used for fever and thirst, coughing with heat in the lungs, spitting up pus from the lung carbuncle, vomiting and retching in the stomach, and astringent pain in hot gonorrhea (burning, stinging and obvious pain in the urine, accompanied by urinary urgency, and discomfort from traction in the lower abdomen). Rehmannia glutinosa is also a medicinal substance that can be used for daily consumption as well as medicine. At the same time, the drug can be used fresh or dried as a dried product. It should be noted that rehmannia root is cold in nature and should not be used by those who have a weak spleen and stomach (weak and cold spleen and stomach) and are prone to diarrhea. If necessary, it is recommended to go to a regular hospital and make a reasonable choice according to one’s own condition under the guidance of a professional physician.