Most of the girl’s aunts will end in 3-7 days. The first menstruation usually occurs around the age of 13. Girls, generally referred to as adolescent females, are in the first few years after the onset of menstruation. Due to the unstable hormone secretion by the gonadal secretion axis, it is easy to cause the hormone level secreted by the ovaries to be disturbed, resulting in prolonged or shortened menstruation. At the same time, as the menstrual cycle and menstrual flow are also unstable, high stress in study or stimulation by cold and flu may lead to unstable menstrual cycle or menstrual period. Two to three years after the first menstruation, as the function of the gonadal secretion axis becomes normal, the hormone level secreted by the ovaries will gradually stabilize, and the menstrual cycle will be regular, and the time of menstruation will gradually become normal, usually within 3-7 days. During menstruation, girls should pay attention to maintain a regular life, eat more nutritious, hot food, avoid getting cold, which is conducive to the normal conduct of menstruation.