It is a normal physiological phenomenon that you do not lose weight in the first few days of your menstruation, and the weight will return to normal after your menstruation period without any special treatment. The lack of weight loss during the premenstrual period is caused by hormonal changes in the body during menstruation, i.e. estrogen increases, retaining more water and sodium ions in the body, making it difficult to lose weight or even gain weight. After the onset of menstruation, the level of estrogen changes accordingly, i.e. gradually decreases, so the retention of water and sodium ions decreases, and a large amount of water and sodium ions can be excreted from the body, allowing the weight to return to normal. If women feel uncomfortable before menstruation, it is recommended to go to the hospital to consult a doctor, under the guidance of the doctor’s scientific treatment, so as to avoid adverse consequences.