Menstrual drowsiness is a normal phenomenon, usually caused by blood loss during menstruation, less estrogen secretion, lower immunity, and poor health. 1, blood loss: more blood loss during menstruation, but also take away more nutrients in the body, which can cause weakness, fatigue, and thus drowsiness; 2, less estrogen secretion: during menstruation, endocrine disruption, resulting in changes in the body. At this time, estrogen will decline, leading to changes in the nervous system, thus causing changes within the body, such as fatigue, weakness, drowsiness, and even headache, dizziness, irritability; 3, lower immunity: during menstruation, the body’s immunity will be reduced, easily causing drowsiness, drowsiness; 4, poor physical quality: if the body quality deviation, menstruation and then bleeding more, can cause weakness, weakness, drowsiness of the body Performance; 5. Other: If malnutrition is caused in order to keep in shape, it is easy to cause insufficient iron intake, thus causing anemia. Combined with the blood loss during menstruation, there may be more blood loss. When the brain is in a state of anemia, it is also easier to have symptoms of dizziness, fatigue, weakness and drowsiness. It is recommended that women strengthen physical exercise in general, such as running and swimming to improve physical fitness. Balanced diet, you can eat more meat, fish, eggs, milk and other protein-rich foods, and your mental state will improve when your anemic state is improved.