The efficacy of mugwort leaf is to warm menstruation and stop bleeding (warming the body’s meridians to stop bleeding in the body), dissipate cold and relieve pain (relieving pain by dispelling cold in the body), and dispel dampness and relieve itching; its use can be used in the treatment of vomiting blood, epistaxis, disintegration (excessive menstruation or dribbling), and excessive menstruation and other conditions. Taken internally, mugwort can warm menstruation and stop bleeding, dispel cold and relieve pain; used externally, it can dispel dampness and relieve itching. Clinically, it is mainly used in the treatment of hematemesis, epistaxis, metrorrhagia, excessive menstruation, fetal leakage (small amount of vaginal bleeding in early pregnancy), hyperemia, cold pain in the abdomen, dysmenorrhea and infertility; and externally, for the treatment of skin itching. Caution should be exercised if there is deficiency of yin and blood heat. Note that the volatile oil in mugwort leaves, which is both an active ingredient and a toxic ingredient, can cause burning and flushing of the skin mucous membranes. The use of mugwort leaves needs to be under the guidance of a professional doctor, not blindly self-medication, so as not to cause adverse consequences.