“Root can prevent hand, foot and mouth disease” is inaccurate, Chinese medicine does not have hand, foot and mouth disease, hand, foot and mouth disease is a common infectious disease, belongs to the Chinese medicine “warm disease” category, rehmannia glutinosa has the effect of clearing away heat and fire (clearing away the body of heat and fire) for hand, foot and mouth disease prevention has some secondary effects, but does not guarantee that the disease will not occur, nor can it cure the hand, foot and mouth disease. Rehmannia glutinosa has the effect of clearing heat and fire (removing heat and fire from the body), which is helpful for the prevention of hand, foot and mouth disease, but it cannot guarantee that the disease will not occur, nor can it be cured. Rehmannia glutinosa is a heat-cleansing herb with a sweet, cold flavor that belongs to the lung and stomach meridians. The main effects of rehmannia root also include generating fluids to quench thirst (promoting the production of fluids to relieve thirst), removing vexation and vomiting, and diuretic. Rehmannia glutinosa is mainly used for treating fever and heat (irritability and sultriness) due to thirst; vomiting due to stomach heat; coughing and coughing up yellowish phlegm due to lung heat; coughing up pus and blood due to lung carbuncle; and short, dark, astringent and painful urine due to fever and gonorrhea (burning and tingling pain in urination, accompanied by urinary urgency, and discomfort of pulling in the lower abdomen). This drug should be used with caution for people with deficiency of spleen and stomach (weak and cold spleen and stomach). Hand, foot and mouth disease is a common infectious disease that belongs to the category of “warm disease” in Chinese medicine, and its mechanism is mainly warmth and heat in the body in normal times, which is compounded by the epidemic virus. Common symptoms include fever and runny nose, vomiting and diarrhea, pimples, herpes and ulcers on hands and feet and in the mouth, affecting food intake. The most important thing to prevent HFMD is to wash hands frequently, ventilate the air, not to go to crowded places, and ensure balanced nutrition and sufficient sleep to prevent the resistance from declining. Please consult a medical professional for specific preventive knowledge. If you have HFMD, please seek immediate medical attention, isolation and regular, systematic treatment.