There are individual differences in the length of the first menstrual period, which may end in 2-3 days or 6-7 days, all of which are normal physiological phenomena. The length of the first menstrual period varies widely. At this time, women have just entered puberty, their reproductive organs are beginning to develop but are not yet mature, the level of hormones secreted is relatively unstable, and the duration of menstruation can fluctuate between 2-7 days. The first menstrual period may clear in 5-6 days for most women. Most of the endometrium is shed and, under the action of estrogen, a new layer of endometrium grows and gradually thickens. If the menstrual period lasts longer than 9 days, the clinical diagnosis is abnormal uterine bleeding. However, because ovarian function is not perfect after menarche, menstruation will not necessarily occur every month for 1-2 years after menarche, but most of the time, after 2 years, ovarian function will gradually improve and the menstrual cycle will be regular. During the menstrual period, you should avoid excessive stress and let nature take its course. At the same time, pay attention to menstrual hygiene and avoid getting cold or overworking.