There are many reasons that lead to weight gain during menstruation, which is considered to be the increased secretion of estrogen and progesterone in the body during menstruation, which can easily cause water and sodium retention in the body, which can cause breast distension and enlargement, and can also cause swelling of the body, which can easily lead to weight gain, which is a normal physiological phenomenon, and can disappear on its own after menstruation is cleaned up. In the menstrual period due to menstrual blood loss, metabolism increases, easy to cause an increase in appetite, increased appetite can also cause weight gain. Menstrual cramps, lumbago and other discomforts will lead to a reduction in activity and inability to exercise, which will cause a large accumulation of fat in the body, which will also lead to obesity. In the menstrual period need regular medical checkups, usually pay attention to small meals, can not overeat, can not sit for a long time, it is best to appropriate walking, jogging, etc., can accelerate the consumption of the body, can prevent obesity.