Menstruation appears leg weakness, mainly related to the following factors: 1, during menstruation, the pelvis is in a state of congestion, edema, pelvic tissue compression of the lower extremity veins and nerves, easy to appear leg weakness. During menstruation, due to the discharge of menstrual blood, specifically in the state of physiological anemia, it is easy to appear around the body fatigue, leg weakness. 2, if the amount of women’s menstruation is too much, with the discharge of menstrual blood loss of potassium ions, the body is prone to lack of potassium ions in the case of weakness in the legs. 3, menstruation period of the body’s resistance is relatively low, it is easy to feel fatigue, and standing for a long time can also lead to weakness in the legs. In order to avoid leg weakness during menstruation, we should pay attention to the intake of nutrients, especially foods containing potassium ions and having the effect of blood replenishment, and avoid standing or sitting for a long time, so as not to affect the blood circulation of the legs.