When menstruation is approaching, you will not gain weight if you live a normal life, and you will gain weight if you overeat. Under normal circumstances, when menstruation is approaching, you should live a reasonable life, have a regular routine and eat normally, which will not lead to excessive accumulation of energy at this time and will not lead to weight gain. However, if you do not have a healthy lifestyle when your period is coming soon, but overeat and do not pay attention to exercise at the same time, then it may cause excessive accumulation of energy and lead to weight gain. If excessive weight gain occurs when menstruation is approaching, it may not be directly related to menstruation. It is recommended to seek medical advice to identify the specific cause and take appropriate measures to intervene to prevent weight gain from affecting health.