1. Menstruation is when menstrual blood--this includes the blood and tissue--from your uterus comes out of the vagina.
2. The first menstruation is called menarche.
3. A typical menstruation cycle lasts for 28 days.
4. To relieve symptoms of painful periods, young women can:
- Exercise regularly
- Apply heat
- Take hormonal birth control
5. Factors contributing to the absence or delay of a period are:
- Pregnancy
- Menopause
- High levels of stress