Puberty in women is marked by menstruation. Generally, puberty in girls is around 12 years old, and since the current living conditions have improved and there is a surplus of nutrition, girls now have an earlier age of menstruation, so the onset of menstruation has a lot to do with the nutritional quality of the body and psychological factors. If there is an excess of nutrients and the substances usually consumed contain substances similar to human estrogen, then it will promote the development of the body’s gonads and express the onset of menstruation earlier. If there is a lack of nutrients, poor physical condition and stressful mental factors, then the onset of menstruation may be pushed back or delayed. Generally speaking, the first menstruation of a girl is called menarche. The onset of menarche represents the further structural and functional perfection of the body’s development and the beginning of the maturation of the female organs. The onset of menarche is sometimes psychologically unprepared, because there are no signs and no certain pattern before it. Therefore, when entering puberty, every girl should pay attention to her body changes and reach the age of puberty and pay attention to her personal physiological hygiene to avoid unnecessary troubles.