When menstruation comes, it can cause weight gain. It can cause an increase in tissue interstitial cells in the body during menstruation, which can also cause general edema and weight gain of about 0.5 to 1 kg. Some women are more sensitive and gain about 2kg, which is a manifestation of menstrual syndrome and will subside after the end of menstruation and will not affect health. You should pay attention to your diet, drink a lot of boiled water to speed up your body’s metabolism, avoid continuous weight gain, and eat less spicy and stimulating food, including cold food, to avoid the stimulation of these foods causing constipation caused by the disruption of the gastrointestinal tract, which will also cause the chance of weight gain. You should also pay attention to the hygiene of your vulva and wash it every day to avoid vaginal inflammation caused by contamination of the vulva with menstrual blood.