Girls bleed during their period because their bodies are shedding the lining of the uterus (womb). This monthly shedding is a natural part of the menstrual cycle. Every month, the uterine lining thickens to prepare for a possible pregnancy. If pregnancy doesn't occur, the body doesn't need this thickened lining, so it's shed through the vagina as menstrual blood and tissue. This process is called menstruation, or a period.
Understanding the Menstrual Cycle
The menstrual cycle is a complex process controlled by hormones. Here's a simplified overview:
- Uterine Lining Buildup: The lining of the uterus thickens in preparation for a fertilized egg.
- No Fertilization: If no fertilization occurs, hormone levels change.
- Shedding of Lining: This hormonal shift triggers the shedding of the uterine lining, resulting in menstrual bleeding.
- Menstrual Blood: The blood expelled during menstruation is a mixture of blood, tissue, and mucus from the uterine lining.
When Does Menstruation Begin?
The average age for a girl's first period (menarche) is around 12, but it can range significantly, from as early as 8 to as late as 16. The onset of menstruation is a key marker of puberty. The timing is influenced by genetics and overall health.
How Long Does a Period Last?
Typically, a period lasts from three to seven days. However, some variation is normal. The amount of bleeding also varies from person to person.
Important Note: Seeking Medical Advice
While menstruation is a natural process, it's crucial to consult a doctor if you experience unusually heavy bleeding, prolonged periods, or severe pain. These could indicate underlying health issues.
References:
- Menstruation is a woman's monthly bleeding, often called your “period.” When you menstruate, your body discards the monthly buildup of the lining of your uterus (womb). Menstrual blood and tissue flow from your uterus through the small opening in your cervix and pass out of your body through your vagina. (Source: Reference provided, but specific URL missing)
- A period is a release of blood from a girl's uterus, out through her vagina. It is a sign that she is getting close to the end of puberty. (Source: Nemours KidsHealth - https://kidshealth.org/en/teens/menstruation.html)
- A period is the part of the menstrual cycle when women, girls and people who menstruate bleed from their vagina. (Source: NHS inform - https://www.nhsinform.scot/healthy-living/womens-health/girls-and-young-women-puberty-to-around-25/periods-and-menstrual-health/periods-menstruation/)
- A period (menstruation) is normal vaginal bleeding that is a natural part of a healthy monthly cycle for a person with a uterus and ovaries. (Source: Healthline - https://www.healthline.com/health/why-do-women-have-periods)
