Swollen legs with menstruation can be caused by sodium and water retention due to changes in hormone levels during menstruation, which in turn leads to swollen legs. During menstruation, due to elevated estrogen levels, it can lead to a certain degree of water and sodium retention, resulting in an increase in extracellular fluid, sodium and water gathered in the tissues between the tissues resulting in intracellular fluids to the tissues, then a certain degree of edema will occur, which is usually relieved after menstruation is over. Some women also have edema in other parts of the body during menstruation, which is also a normal physiological phenomenon and does not require special treatment. Usually, you can eat a light diet, eat less food with high salt content, and drink more water to promote metabolism. If the edema is obvious, it is recommended to consult a doctor in time, symptomatic treatment, to avoid delaying the condition.