It is very common to feel very tired when you have your period. The reasons that lead to women being more tired during menstruation are mainly the following: 1. During menstruation women experience a series of uncomfortable symptoms, such as dizziness, abdominal pain, lumbago, and feeling bulky, all related to the change in hormone levels when they have their period. In addition, the release of prostaglandins increases during menstruation, so the symptoms of stomach pain and lumbago will be more obvious, and it is easier to feel strained in this state. 2. Before and during menstruation, women’s bodies are in a state of water and sodium retention, so they will feel bulky. At this time, if the rest is not good, overwork will increase the sense of fatigue, so during the menstrual period is not recommended strenuous exercise, to pay proper attention to rest.