The lack of energy in the days before menstruation is mainly due to the fact that hormone levels have started to drop before menstruation. When hormone levels drop to a certain extent, the endometrium loses the support of estrogen and progesterone to shed and bleed. So before menstruation due to individual differences, some people are more sensitive to the decline in hormone levels, there is no energy symptoms, you can replenish energy, drink a bowl of hot brown sugar water every day to make the menstrual blood more smoothly discharge, can replenish energy, all will play a better role, but also improve the symptoms of no energy. In daily life it is also recommended that these women drink more soy milk or drink royal jelly appropriately, which will improve the hormone levels in the body accordingly and also improve the symptoms of lack of energy before menstruation.