About every 28 days, four hormones work together. They ripen an egg and get the uterus ready. 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)
