Dihuang, or Di Huang, has the effects of clearing heat and generating fluids, cooling blood, stopping bleeding, and clearing heat and nourishing yin. It is mainly used for treating symptoms such as irritable thirst with a red tongue, sore throat, fever due to deficiency of yin, and injury to yin caused by heat illnesses. Dihuang, sweet, bitter and cold in nature, enters the heart meridian, liver meridian and kidney meridian, belongs to the herbs of clearing heat and cooling blood, its main efficacy is to clear heat and cool blood, nourish yin and promote the production of body fluid. Clinically, it is often used in the treatment of various diseases caused by heat into the camp blood, and also has a certain therapeutic effect on various bleeding cases caused by blood heat. In addition, for fever thirst, internal heat thirst, constipation due to injury to the yin also has a certain therapeutic effect. There are two types of Dihuang: Dried Dihuang and Raw Dihuang, which have slightly different effects and functions. The main effects of raw dihuang are clearing heat and generating fluids, cooling the blood and stopping bleeding. Dried Dihuang’s main effect is to cool the blood, stop bleeding, nourish Yin and clear heat. It should be noted that Dihuang is cold in nature and should not be used by patients with spleen deficiency and dampness, or those with abdominal fullness and loose stools. The use of Chinese herbs should be under the guidance of a professional doctor or pharmacist, and patients should avoid using them on their own, so as not to cause damage to the body if they are not used properly.