The onset of menstruation is called the menstrual period. Menstruation is the periodic exfoliation and bleeding of the endometrium, and the cyclic changes of the endometrium are called the menstrual cycle, which are the follicular phase, the secretory phase and the menstrual phase. The menstrual period is the time from the first day of menstruation to the end of menstruation, which usually lasts 3-7 days. Menstruation is a mixture of blood, shed endometrium as well as cervical mucus and vaginal secretions, which are discharged out of the body along the vagina. Due to the increased secretion of prostaglandins during menstruation, some women may experience abdominal pain, dizziness, nausea, weakness and other menstrual pain symptoms, which are usually more severe during the first two days of menstruation and will gradually ease afterwards. The actual fact is that you should pay extra attention to personal hygiene during your menstrual period, and it is recommended to wash your vulva with flowing water daily to avoid bacterial growth. In addition, care should be taken not to bathe or swim to avoid infection. Smoking and alcohol are forbidden during menstruation. Avoid eating spicy and stimulating diet and sexual life as much as possible.