Women experience some degree of weight gain during menstruation, which begins 1 week before menstruation. The main reason for this occurrence is due to the increase in estrogen levels in the body during the period before menstruation. With higher levels of hormones, there is water and sodium retention in the body, resulting in weight gain, often accompanied by mild symptoms of swelling. The weight gain is not necessarily fat, but more water. It is a normal physiological phenomenon to reduce the water and sodium retention after menstruation and return the weight to normal level. Within 1 week before menstruation, pay attention not to eat food with too much salt, eat a light diet, drink more water, eat more fresh vegetables and fruits, increase the intake of protein appropriately, pay more attention to rest, avoid excessive physical exercise and physical labor.