Problems with the menstrual cycle, the process that prepares the female body for pregnancy, can lead to infertility. The menstrual cycle includes several phases, and problems at any one of the stages can lead to difficulty getting pregnant or to infertility.
To learn about a normal menstrual cycle, visit the Menstruation section of this website.
To learn about common problems that may occur during the menstrual cycle, visit the What are menstrual irregularities? page.