Mugwort contains aromatic volatile oil, which excites the smooth muscle of the uterus and causes compulsive contractions, which may cause miscarriage in pregnant women with uterine contractions. Therefore, it is not recommended for pregnant women to go for moxibustion, unless the patient is identified to be deficient in cold and has symptoms of pre-eclampsia miscarriage, and it is OK to apply moxibustion for a short period of time. Regardless of whether it is early, middle or late stage, moxa itself contains volatile oil, which has a contraction effect on the smooth muscle of the uterus, and if applied in large quantities for a long time, it can cause contraction of the uterus and cause miscarriage. Many animal experiments have confirmed this risk. However, the Chinese medical evidence is that pre-eclampsia belongs to deficiency cold, not heat. The application of moxibustion for a short period of time can have a fetal preservation effect. Therefore, it must be applied under the guidance of a Chinese medicine practitioner in a regular hospital.