When women have sore legs and back pain during menstruation, the following two main causes are considered: First, women are overworked during menstruation, the overall physical condition of women decreases after menstruation, and the amount of labor women can bear during menstruation is less than the amount of labor they can usually bear, so the same amount of labor can cause discomfort such as back pain and sore legs during menstruation. Second, if the patient is accompanied by the menstrual cycle, the periodic appearance of lumbago and leg pain consider the patient has kidney deficiency. The menstrual blood comes out of the kidneys, kidney essence and kidney energy are abundant, women will have normal menstrual flow, if the patient’s kidney deficiency menstrual flow will lead to further aggravation of the patient’s kidney deficiency. The kidney is the house of the waist, and the kidney is the master of the bones. Women with kidney deficiency can have lower back pain and leg pain, as well as dizziness, tinnitus, forgetfulness and other clinical manifestations.