The precursors of menstruation mainly include lower abdominal cramping, breast swelling, tingling, excessive mood swings, etc. The menstrual flow will occur about 2-3 days after the above-mentioned performance, so prepare towels, sanitary napkins and underwear in advance to be ready for the arrival of menstruation, drink more hot water and do not touch raw and cold food. Menstrual blood is the best medium for bacteria, so be sure to do a good job of menstrual hygiene, change sanitary napkins and underwear regularly, and change sanitary napkins every 2-4 hours to prevent bacterial growth and induce vaginitis, cervicitis and other gynecological inflammatory diseases. During menstruation, you can drink more brown sugar water, which has the effect of warming the uterus and regulating menstruation, as well as replenishing the loss of minerals and trace elements in the body.