Women feel more tired as they feel a particularly pronounced fall in the lower back and their bodies are a bit bulky. The reason why women feel very tired during menstruation is mainly due to the following situations. First, during menstruation, a woman’s pelvic cavity will be in a state of congestion, and this pelvic congestion will cause a woman to feel a particularly pronounced swelling in the lower back, and her body is a bit heavy, so she will feel more tired, and the symptoms of congestion will worsen after activities. In addition, the congestion will also cause back pain and stomach pain, so these uncomfortable situations will also make women feel more tired. Secondly, during menstruation, a woman’s resistance is lower than usual, so if she does not rest well during this period, she will feel more tired. Third, during menstruation, the release of prostaglandins in women’s body is also increased, which will lead to uterine cramps, intestinal cramps and a series of uncomfortable situations. Fourthly, during menstruation there is a slight retention of water and sodium leading to oedema, which is also a cause of tiredness.