Menstruation begins when progesterone and estrogen levels drop.

Authors

• Person: Not available Organization: Clue
  Understanding the Phases of the Menstrual Cycle - Clue

Sources

• Understanding the Phases of the Menstrual Cycle - Clue helloclue.com Clue via serper

Referenced by nodes (3)

• estrogen concept
• progesterone concept
• menstruation concept