Dang Gui Si Yi Tang consists of Angelica sinensis, Sinensis and Cinnamomum cassiae, decocted in water with the dregs removed, and is taken once a day, with specific dosage to be followed by the doctor. Dang Gui Si Yi Tang is from the Treatise on Typhoid Fever and is composed of 12 grams of Angelica sinensis, 3 grams of Sinensis, 9 grams of Gui Zhi, 9 grams of Paeonia lactiflora, 6 grams of Licorice, 6 grams of Tong Cao, and 8 jujubes. It has the efficacy of warming the meridians and dispersing cold (warming the meridians of the human body and dispelling the cold in the body), nourishing the blood and opening the veins. It is mainly used in the treatment of blood deficiency and cold syncope, and is commonly used in the treatment of Raynaud’s disease, frozen shoulder, dysmenorrhea, which is characterized by blood deficiency and cold condensation. Patients should go to the hospital in time after the occurrence of uncomfortable symptoms, under the guidance of a professional Chinese medicine practitioner’s identification and rational use of medication, do not blindly take medication on their own, so as to avoid delaying the condition or side effects.