How many days does the first menstruation usually take?

The first menarche is menarche, menarche age is generally 13 to 15 years old, due to unstable hormone levels after menarche, ovarian development is immature, so may show short-term irregular menstruation symptoms, generally the time of menarche is about 3 to 7 days, but just when menstruation may show irregular menstruation, so menarche menarche a few days is not clear, pay attention to close observation of menstrual conditions, Because in adolescence affected by the environment and mood swings, etc., may affect the menstrual cycle, as well as the number of menstruation, so in the menstrual period to relax mood, can not eat cold food, pay attention to eat more warm tonic diet.