💡 Key Idea
The Menstrual Cycle: A 28-Day Hormonal Rhythm
One cycle, four phases, one egg.
The menstrual cycle is a recurring ~28-day ovarian cycle in females, ending in menstruation. It is divided into four phases controlled by hormones.
↳ The cycle is counted from the first day of menstrual flow to the next onset, about 28 days later.
📖 Definition
Menarche, Menopause & Menstruation
Three M-words that define reproductive life.
↳ Menstruation is absent before puberty, during pregnancy, and after menopause.
⭐ Important Fact
How Long Does Menstrual Flow Last?
Three to five days of flow.
↳ Flow duration (3–5 days) is shorter than the full cycle (28 days) — don't confuse the two.