Patient's question:
NoDoctor's answer:
Hello! Due to the effect of sex hormones secreted by the ovaries, the endometrium in teenage girls undergoes cyclical changes, shedding once a month. The shed mucous membrane and blood are expelled from the body through the vagina, and this bleeding phenomenon is known as menstruation. Since most people experience it once a month, it is called menstruation. Before menstruation, small blood streaks are often found on underwear. A series of changes occur in a woman's body before her first menstrual period. If these changes are understood, the time of her first menstrual period can be predicted.