Roughly every 28 days, a coordinated dance of four hormones ripens an egg and prepares the uterus. Tap a phase to see the hormones, the ovary, and the lining.
Menstrual phase
hormone levels · day 1 → 28
The menstrual cycle~28 days
The phases
📷 Reference image
A real labeled figure to compare with the interactive above.
The Menstrual Cycle — Mikael Häggström, Public domain (via Wikimedia Commons)
