Cooling the Blood is a term used in Chinese medicine to refer to the treatment of heat in the Blood (the deepest stage or disease site among the four periods of Wei Qi and Ying Blood in warm diseases). Cooling the Blood means using medicines with a cold nature to remove the heat evil in the Blood Compartment, so as to normalize a series of symptoms in the body caused by Blood heat. Symptoms that tend to occur in Blood heat syndrome include restlessness, vomiting blood, nose bleeding, female metrorrhagia (excessive menstrual flow or dribbling), petechiae and ecchymosis, insomnia, excessive dreaming, and a reddish-red tongue. Commonly used clinical herbs to cool blood include rhinoceros horn, mudanpi, xuanshen, danshen, red peony, raw dihuang, rhubarb, comfrey, qingdai, baimao root, poria, and so on. Patients with symptoms of heat evil in blood can choose cool foods such as winter melon, lotus seed and barley in their diet. It is recommended that patients with the above symptoms go to a regular medical institution, do not take blood-cooling Chinese medicine on your own to avoid adverse consequences.